CN100594475C - Projection type capacitance touch control device and method for recognizing different contact position - Google Patents
Projection type capacitance touch control device and method for recognizing different contact position Download PDFInfo
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- CN100594475C CN100594475C CN200810214439A CN200810214439A CN100594475C CN 100594475 C CN100594475 C CN 100594475C CN 200810214439 A CN200810214439 A CN 200810214439A CN 200810214439 A CN200810214439 A CN 200810214439A CN 100594475 C CN100594475 C CN 100594475C
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Abstract
The invention relates to a projection-type capacitive touch control device and a method for recognizing different contact positions produced on a projection capacitance touch control panel. The methodincludes the following steps: step 1, generating a first contact group of reference values, according to a first contact position; step 2, generating a plurality of second groups of reference values,according to a second contact position, wherein, the plurality of second groups of reference values have a Real second group of reference values, and at least one Ghost second group of reference values including part of values of the first contact group of reference values; and step 3, filtering the at least one Ghost second group of reference values. The touch control device and recognizing method of the invention can realize the function of multi-point touch control detection, and can be applied on thin type or small-scale screens.
Description
Technical field
The present invention relates to the method for a kind of projection type capacitance touch control device and identification contact position thereof; Be particularly related to a kind of method that is used to discern the projection type capacitance touch control device of different contact position and discerns contact position.
Background technology
The communication interface of past people and computing machine or machine is mainly based on keyboard and slide-mouse.Along with scientific-technical progress, product design is towards more friendly man-machine interface development, the touch panel device has become quite general input media, and is widely used in personal computer, notebook computer, personal digital assistant, mobile phone, Automatic Teller Machine and various ticket booking machine etc.This intuitive input mode, allow the user can on screen, directly carry out required function quite like a cork, so can save as keyboard, slide-mouse or other extra input equipments,, and better appearance design be arranged so as to the volume and the weight of minimizing application product.
Common touch technology is broadly divided into five kinds of touch technologies such as resistance-type (Resistive), condenser type (Capacitive), acoustic wave (Surface Acoustic Wave), optical profile type (Optics) and electromagnetic type at present, and described a plurality of touch technologies all have its relative merits and are applicable to different fields.
Along with the development of touch technology, the notion of multi-point touch is suggested thereupon and is developed.Compared to the mode of traditional single-point input, the mode of multi-point touch input can allow the user carry out more complicated, diversified feature operation, thereby is subjected to suitable attention.In numerous touch technologies, resistance-type and acoustic wave touch technology are subject to its principle of induction, and can't reach function of multi-spot touch.Induction touch technology need use special-purpose time writer to operate, so and is unfavorable in the application of multi-point touch.Though the optical induction type touch technology can detect the diverse location of multi-point touch, owing to need corresponding spatial configuration, make touch-control system have bigger volume so that the reflected light receiver to be installed, therefore be not suitable for being used on slim or the small-size screen.
From the above, the capacitive induction touch technology becomes then and can reach the preferable selection that multiple spot touches.Compared to other touch technologies, the capacitive induction touch technology only need be pointed and touch, the touch-control of need not exerting pressure, utilize screen tool resolution height, the good advantage of transmittance of capacitive touch control techniques in addition, and be fit to can be used on slim, the undersized screen, also can realize function of multi-spot touch simultaneously, therefore become the emphasis of industry development.
Generally speaking, the capacitor induction type touch technology is to utilize transparency electrode and the finger capacitance variation that electrostatic induction produced, and comes detection coordinates at the electric current that its position of touch produced.Can be divided into two kinds of surface capacitance type (Surface Capacitive) and projected capacitives (Projective Capacitive) again according to its induction mode, yet the surface capacitance type touch technology can only detect single-point touch at present, has only the projective capacitive touch technology can realize detecting function of multi-spot touch.
Figure 1 shows that known projection type capacitance touch control device 1 structural representation.Projection type capacitance touch control device 1 comprises protective seam 11, display device 12, projection type capacitance touch control panel 13 and controller 14.Protective seam 11 is a transparent material, is positioned at the superiors of projection type capacitance touch control device 1.Display device 12 is positioned at the orlop of projection type capacitance touch control device 1, projects image towards the top.Projection type capacitance touch control panel 13 is electrically connected to controller 14 between protective seam 11 and display device 12.
Please refer to Fig. 2, have two groups of induction electrodes that are not parallel to each other on the projection type capacitance touch control panel 13, these two groups of induction electrodes cross one another and correspond respectively to different coordinate axis, and each is organized induction electrode and has a plurality of induction electrodes respectively.For example, projection type capacitance touch control panel 13 has a plurality of X-axis induction electrodes 131 and a plurality of Y-axis induction electrode 132, and wherein X-axis induction electrode 131x and Y-axis induction electrode 132y intersect at contact position 133.
Because have static on the finger; as user during with finger touch protective seam 11; be positioned at contact position 133 places of corresponding position of touch on the projection type capacitance touch control panel 13; just can produce the inductance capacitance value and change and potential difference (PD), and make the X-axis induction electrode 131x and the Y-axis induction electrode 132y that pass through this contact position 133 produce potential change and small induction current.By detecting this potential change and/or induction current, projection type capacitance touch control panel 13 is able to generation group reference signal, and should organize reference signal and be passed to controller 14, and 14 of controllers produce one group of coordinate figure according to this group reference signal.According to this group coordinate figure, application program is judged the function that user institute desire is carried out.
Fig. 3 is user's synoptic diagram of 2 on the touch-control projection type capacitance touch control device 1 simultaneously.As user simultaneously during two diverse locations on the touch-control protective seam 11, will produce the inductance capacitance value on corresponding to the first contact position 133a and the second contact position 133b on the projection type capacitance touch control panel 13.Can produce potential change and induction current respectively so intersect at the first X-axis induction electrode 131a and the first Y-axis induction electrode 132a of the first contact position 133a, the second X-axis induction electrode 131b and the second Y-axis induction electrode 132b that intersect at the second contact position 133b also can produce induction current respectively.
Yet under this situation, projection type capacitance touch control panel 13 will detect potential change and/or the induction current that corresponds respectively to two X coordinate axis and two Y coordinates simultaneously, and it corresponds respectively to two X coordinate figures and two Y coordinate figures.Described a plurality of X coordinate figure and Y coordinate figure, but with combination in any is to represent four contact positions of the first contact position 133a, the second contact position 133b, the 3rd contact position 133c and the 4th contact position 133d respectively, wherein the 3rd contact position 133c and the 4th contact position 133d are the shadow contact position, and meaning promptly is not the actual position that clicks of user.Because can't differentiating what person of aforementioned four contact positions according to described a plurality of X coordinate figures and Y coordinate figure, puts by controller 14 for user's actual point bit selecting, promptly do not have the ability of telling the first contact position 133a and the second contact position 133b, make projection type capacitance touch control device 1 can't carry out the operating function of multi-point touch.
In view of this, providing a kind of the have projection type capacitance touch control device of discerning the different contact position function, the method that reaches the identification different contact position, is to be industry problem anxious to be solved.
Summary of the invention
The object of the present invention is to provide a kind of method of discerning different contact position, this different contact position results from the projection type capacitance touch control panel, and this method comprises the following step: step 1 produces first group of referential data according to first contact position; Step 2 is according to second contact position, produce a plurality of second group of referential data, wherein said a plurality of second group of referential data, have second group of referential data of actual second group of referential data and at least one shadow, second group of referential data of described at least one shadow comprises a part of numerical value of this first group of referential data; And second group of referential data of described at least one shadow of step 3 filtering.
In described method, wherein this step 1 is according to this first contact position, produces first group of coordinate figure; This step 2 is according to this second contact position, produces a plurality of second group of coordinate figure.
In described method, wherein this step 1 is according to this first contact position, produces first group of two-dimensional coordinate value; This step 2 is according to this second contact position, produce three second group of two-dimensional coordinate values, it has actual second group of two-dimensional coordinate value and second group of two-dimensional coordinate value of two shadows, and second group of two-dimensional coordinate value of each described shadow comprises the wherein one dimension coordinate figure of this first group of two-dimensional coordinate value.
In described method, wherein after this step 2, also comprise the following step: the difference of confirming second group of referential data of this reality and this first group of referential data is greater than threshold values.
In described method, wherein this step 1 comprises the following step: confirm this first contact position in first scan period.
In described method, wherein this step 2 comprises the following step: confirm this second contact position in second scan period.
In described method, also comprise the following step:, produce one first group continuous referential data row according to first track that this first contact position moves.
In described method, also comprise the following step:, produce second group of continuous referential data row according to second track that this second contact position moves.
Another object of the present invention is to provide a kind of projection type capacitance touch control device, comprises: the projection type capacitance touch control panel, in order to produce reference signal according to contact position; Controller, be connected to this projection type capacitance touch control panel, in order to first reference signal that produces according to first contact position, produce first group of referential data, and second reference signal that produces according to second contact position, produce a plurality of second group of referential data, wherein said a plurality of second group of referential data, have second group of referential data of actual second group of referential data and at least one shadow, second group of referential data of described at least one shadow comprises a part of numerical value of this first group of referential data; And processor, in order to second group of referential data of described at least one shadow of filtering.
In described projection type capacitance touch control device, wherein this controller produces first group of coordinate figure and a plurality of second group of coordinate figure respectively according to this first contact position and this second contact position.
In described projection type capacitance touch control device, wherein this controller is according to this first contact position and this second contact position, produce first group of two-dimensional coordinate value and three second group of two-dimensional coordinate values respectively, it has actual second group of two-dimensional coordinate value and second group of two-dimensional coordinate value of two shadows, second group of two-dimensional coordinate value of each described shadow comprises the wherein one dimension coordinate figure of this first group of two-dimensional coordinate value.
In described projection type capacitance touch control device, wherein this processor also in order to the difference of confirming second group of referential data of this reality and this first group of referential data greater than threshold values.
In described projection type capacitance touch control device, wherein this controller is confirmed this first contact position in first scan period.
In described projection type capacitance touch control device, wherein this controller is confirmed this second contact position in second scan period.
In described projection type capacitance touch control device, wherein first track that also moves according to this first contact position of this controller produces one first group continuous referential data row.
In described projection type capacitance touch control device, wherein second track that also moves according to this second contact position of this controller produces second group of continuous referential data row.
In described projection type capacitance touch control device, wherein this first scan period is greater than 80 hertz.
In described projection type capacitance touch control device, wherein this second scan period is greater than 80 hertz.
Another object of the present invention is to provide a kind of projection type capacitance touch control device, comprise: generation device, in order to according to first contact position, produce first group of referential data, and according to second contact position, produce a plurality of second group of referential data, wherein, described a plurality of second group of referential data have second group of referential data of actual second group of referential data and at least one shadow, second group of referential data of described at least one shadow comprises a part of numerical value of this first group of referential data; And filtering device, in order to second group of referential data of described at least one shadow of filtering.
In described projection type capacitance touch control device, wherein this generation device produces first group of coordinate figure and a plurality of second group of coordinate figure respectively according to this first contact position and this second contact position.
In described projection type capacitance touch control device, wherein this generation device is according to this first contact position and this second contact position, produce first group of two-dimensional coordinate value and three second group of two-dimensional coordinate values respectively, it has actual second group of two-dimensional coordinate value and second group of two-dimensional coordinate value of two shadows, second group of two-dimensional coordinate value of each described shadow comprises the wherein one dimension coordinate figure of this first group of two-dimensional coordinate value.
In described projection type capacitance touch control device, wherein this generation device also in order to the difference of confirming second group of referential data of this reality and this first group of referential data greater than threshold values.
In described projection type capacitance touch control device, wherein this generation device is confirmed this first contact position in first scan period.
In described projection type capacitance touch control device, wherein this generation device is confirmed this second contact position in second scan period.
In described projection type capacitance touch control device, wherein this generation device first track in order to move according to this first contact position also produces one first group continuous referential data row.
In described projection type capacitance touch control device, wherein this generation device second track in order to move according to this second contact position also produces second group of continuous referential data row.
In described projection type capacitance touch control device, wherein this first scan period is greater than 80 hertz.
In described projection type capacitance touch control device, wherein this second scan period is greater than 80 hertz.
The present invention has realized the detection function of multi-spot touch, and be suitable for use in slim or small-size screen on.
For above-mentioned purpose of the present invention, technical characterictic and advantage can be become apparent, hereinafter be elaborated with the preferred embodiment conjunction with figs..
Description of drawings
Fig. 1 is known projection type capacitance touch control device synoptic diagram;
Fig. 2 is the single-point touch synoptic diagram of known projection type capacitance touch control device;
Fig. 3 Fig. 3 is the multi-point touch synoptic diagram of known projection type capacitance touch control device;
Fig. 4 is a projection type capacitance touch control device synoptic diagram of the present invention;
Fig. 5 is a projection type capacitance touch control device operation chart of the present invention; With
Fig. 6 discerns the method flow diagram of different contact position for the present invention.
Wherein, description of reference numerals is as follows:
1 projection type capacitance touch control device, 11 protective seams
12 display device, 13 projection type capacitance touch control panels
131X axle induction electrode 131xX axle induction electrode
The 131a first X-axis induction electrode 131b second X-axis induction electrode
132Y axle induction electrode 132yY axle induction electrode
The 132a first Y-axis induction electrode 132b second Y-axis induction electrode
133 contact position 133a, first contact position
The 133b second contact position 133c the 3rd contact position
133d the 4th contact position 14 controllers
2 projection type capacitance touch control devices, 21 projection type capacitance touch control panels
22 controllers, 23 processors
24 first contact positions, 25 second contact positions
The 25a first shadow contact position 25b second shadow contact position
Embodiment
Fig. 4 is a projection type capacitance touch control device structural representation of the present invention.Projection type capacitance touch control device 2 comprises projection type capacitance touch control panel 21, controller 22 and processor 23.Projection type capacitance touch control panel 21 can be responded to user's touch-control, and produces reference signal according to contact position.Controller 22 is connected to projection type capacitance touch control panel 21 and processor 23 respectively, and can produce at least one referential data according to the reference signal that projection type capacitance touch control panel 21 is produced.Processor 23 can receive and filter this referential data.
Figure 5 shows that the synoptic diagram that carries out the multi-point touch operation.When first different on user's while touch-control projection type capacitance touch control device 2 contact position 24 and second contact position 25, usually the time life period of these two contact generations is poor, the difference finger that also is the user can touch first contact position 24 earlier, touches second contact position 25 again.In order to realize discerning the function of different contact position, projection type capacitance touch control device 2 of the present invention has the scan period, extremely poor by reducing this scan period less than this duration of contact, projection type capacitance touch control device 2 gets so that different contacts dropped in the different scan periods, with the contact sequencing of identification different contact position.Anticipate promptly, controller 22 is confirmed this first contact position 24 in first scan period, and confirms this second contact position 25 in second scan period.On practice, this scan period also is that sweep frequency is preferably more than 80 hertz (Hz) preferably less than 0.0125 second, can make projection type capacitance touch control device 2 discern the contact sequencing of different contact position more effectively.
When first contact position 24 was touched in first scan period, projection type capacitance touch control panel 21 can produce first reference signal according to first contact position 24, and this first reference signal is sent to controller 22.Controller 22 is confirmed first reference signal of this first contact position 24 in this first scan period after, can produce corresponding first group of referential data according to this first reference signal of this first contact position generation.This first group of referential data can be first group of coordinate figure, this first group of coordinate figure can be one group of two-dimensional coordinate value, one group of D coordinates value and other dimension coordinate figures one of them.In the present embodiment, first group of referential data is first group of two-dimensional coordinate value.
Next, when second contact position 25 in second scan period during by touch-control, will produce on the projection type capacitance touch control panel 21 and transmit comprise second contact position 25 second reference signal to controller 22.Controller 22 produces a plurality of second group of referential data according to this second reference signal.Similarly, described a plurality of second group of referential data can be a plurality of second group of coordinate figure, arbitrary described a plurality of second group of coordinate figure can be one group of two-dimensional coordinate value, one group of D coordinates value and other dimension coordinate figures one of them.In the present embodiment, described a plurality of second group of referential data is a plurality of second group of two-dimensional coordinate value.
From the above, analyze above-mentioned first group of referential data and a plurality of second group of referential data, as can be known its comprised first group of referential data altogether corresponding to first contact position 24, corresponding to second group of referential data of reality of second contact position 25, and second group of referential data of at least one shadow.Second group of referential data of described at least one shadow comprises a part of numerical value of this first group of referential data, and corresponding to the shadow contact position of non-actual contact.
See also Fig. 5, second group of referential data of present embodiment comprises second group of referential data of two groups of shadows, and it corresponds respectively to the first shadow contact position 25a and the second shadow contact position 25b.In detail, second group of referential data of these two groups of shadows is second group of two-dimensional coordinate value of two groups of shadows, and second group of two-dimensional coordinate value of each described shadow comprises a part of coordinate figure wherein of this first group of two-dimensional coordinate value.
Yet the user carry out single when touching function, if single touch point area is excessive, then might cause projection type capacitance touch control panel 21 to judge that it is a plurality of touch location, and then produce second group of reference signal, and produce a plurality of second group of referential data via controller 22.For fear of said circumstances, processor 23 can will be judged as actual second group of referential data and first group of referential data compares, when the difference of confirming first group of referential data and second group of referential data during, can assert that just it is multi-point touch rather than false touch greater than threshold values.
Figure 6 shows that an alternative embodiment of the invention, be the method flow diagram of identification different contact position.Present embodiment is applicable to aforesaid projection type capacitance touch control device.Below be example with projection type capacitance touch control device 2, this method flow process is described.In step 601, controller 22 is confirmed first contact position 24 in first scan period, and follows in step 602, and controller 22 produces corresponding first group of referential data according to this first reference signal that this first contact position 24 produces.In step 603, controller 22 is confirmed this second contact position 25 in second scan period, and follows in step 604, and controller 22 produces corresponding a plurality of second group of referential data according to this second reference signal that this second contact position 25 produces.In step 605, processor 23 will be with reference to the coordinate of first group of referential data, and in differentiation and a plurality of second group of referential data of filtering, at least one is second group of referential data of shadow, draws actual second group of referential data.Then in step 606, processor 23 can first group of referential data of comparison and is judged as actual second group of referential data, and when the difference of confirming first group of referential data and second group of referential data during greatly at threshold values, it is multi-point touch but not false touch for side's identification.
By the method for above-mentioned projection type capacitance touch control device and identification contact position, the multipoint touch position on the contactor control device is identified.Further use,, also can finish whereby as judgement in the enterprising line operate gesture of contactor control device.When finger carries out multi-point touch and touches position of touch on contactor control device, first trajectory generation, the first continuous reference signal that projection type capacitance touch control panel 21 can move according to this first contact position, controller 22 can produce one first group continuous referential data row according to this first continuous reference signal.In like manner, second trajectory generation, the second continuous reference signal that projection type capacitance touch control panel 21 can move according to this second contact position, controller 22 can produce second group of continuous referential data row according to this second continuous reference signal.23 of processors carry out corresponding control according to this first group continuous referential data row and this second group continuous referential data row, for example amplify partial picture, close operation such as current picture.
The above embodiments only are used for enumerating embodiments of the present invention, and explain technical characterictic of the present invention, are not to be used for limiting protection category of the present invention.Any those of ordinary skills can unlabored change or the arrangement of the isotropism scope that all belongs to the present invention and advocated, and the scope of the present invention should be as the criterion with claims.
Claims (19)
1. method of discerning different contact position, this different contact position results from the projection type capacitance touch control panel, and this method comprises the following step:
Step 1. is confirmed first contact position in first scan period, according to first contact position, produce first group of coordinate figure;
Step 2. is confirmed second contact position in second scan period, according to second contact position, produce a plurality of second group of coordinate figure, wherein said a plurality of second group of coordinate figure, have second group of coordinate figure of actual second group of coordinate figure and at least one shadow, second group of coordinate figure of described at least one shadow comprises a part of numerical value of this first group of coordinate figure; And
Second group of coordinate figure of described at least one shadow of step 3. filtering.
2. the method for claim 1, wherein this step 1 is according to this first contact position, produces first group of two-dimensional coordinate value; This step 2 is according to this second contact position, produce three second group of two-dimensional coordinate values, it has actual second group of two-dimensional coordinate value and second group of two-dimensional coordinate value of two shadows, and second group of two-dimensional coordinate value of each described shadow comprises the wherein one dimension coordinate figure of this first group of two-dimensional coordinate value.
3. the method for claim 1 wherein after this step 2, also comprises the following step:
The difference of confirming second group of coordinate figure of this reality and this first group of coordinate figure is greater than threshold values.
4. the method for claim 1 also comprises the following step:
According to first track that this first contact position moves, produce first group of continuous coordinate value row.
5. the method for claim 1 also comprises the following step:
According to second track that this second contact position moves, produce second group of continuous coordinate value row.
6. projection type capacitance touch control device comprises:
The projection type capacitance touch control panel is in order to produce reference signal according to contact position;
Controller, be connected to this projection type capacitance touch control panel, this controller is confirmed first contact position in first scan period, confirm second contact position in second scan period, first reference signal in order to produce according to first contact position produces first group of coordinate figure, and second reference signal that produces according to second contact position, produce a plurality of second group of coordinate figure, wherein
Described a plurality of second group of coordinate figure has second group of coordinate figure of actual second group of coordinate figure and at least one shadow, and second group of coordinate figure of described at least one shadow comprises a part of numerical value of this first group of coordinate figure; And
Processor is in order to second group of coordinate figure of described at least one shadow of filtering.
7. projection type capacitance touch control device as claimed in claim 6, wherein this controller is according to this first contact position and this second contact position, produce first group of two-dimensional coordinate value and three second group of two-dimensional coordinate values respectively, it has actual second group of two-dimensional coordinate value and second group of two-dimensional coordinate value of two shadows, second group of two-dimensional coordinate value of each described shadow comprises the wherein one dimension coordinate figure of this first group of two-dimensional coordinate value.
8. projection type capacitance touch control device as claimed in claim 6, wherein this processor also in order to the difference of confirming second group of coordinate figure of this reality and this first group of coordinate figure greater than threshold values.
9. projection type capacitance touch control device as claimed in claim 6, wherein first track that also moves according to this first contact position of this controller produces first group of continuous coordinate value row.
10. projection type capacitance touch control device as claimed in claim 6, wherein second track that also moves according to this second contact position of this controller produces second group of continuous coordinate value row.
11. projection type capacitance touch control device as claimed in claim 6, wherein this first scan period is greater than 80 hertz.
12. projection type capacitance touch control device as claimed in claim 6, wherein this second scan period is greater than 80 hertz.
13. a projection type capacitance touch control device comprises:
Generation device, this generation device are confirmed this first contact position in first scan period, confirm second contact position in second scan period, in order to according to first contact position, produce first group of coordinate figure, and according to second contact position, produce a plurality of second group of coordinate figure, wherein
Described a plurality of second group of coordinate figure has second group of coordinate figure of actual second group of coordinate figure and at least one shadow, and second group of coordinate figure of described at least one shadow comprises a part of numerical value of this first group of coordinate figure; And
Filtering device is in order to second group of coordinate figure of described at least one shadow of filtering.
14. projection type capacitance touch control device as claimed in claim 13, wherein this generation device is according to this first contact position and this second contact position, produce first group of two-dimensional coordinate value and three second group of two-dimensional coordinate values respectively, it has actual second group of two-dimensional coordinate value and second group of two-dimensional coordinate value of two shadows, second group of two-dimensional coordinate value of each described shadow comprises the wherein one dimension coordinate figure of this first group of two-dimensional coordinate value.
15. projection type capacitance touch control device as claimed in claim 13, wherein this generation device also in order to the difference of confirming second group of coordinate figure of this reality and this first group of coordinate figure greater than threshold values.
16. projection type capacitance touch control device as claimed in claim 13, wherein this generation device first track in order to move according to this first contact position also produces first group of continuous coordinate value row.
17. projection type capacitance touch control device as claimed in claim 13, wherein this generation device second track in order to move according to this second contact position also produces second group of continuous coordinate value row.
18. projection type capacitance touch control device as claimed in claim 13, wherein this first scan period is greater than 80 hertz.
19. projection type capacitance touch control device as claimed in claim 13, wherein this second scan period is greater than 80 hertz.
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