CN101980123B - Touch panel device with high touch sensitivity and touch positioning method thereof - Google Patents
Touch panel device with high touch sensitivity and touch positioning method thereof Download PDFInfo
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- CN101980123B CN101980123B CN2010105306871A CN201010530687A CN101980123B CN 101980123 B CN101980123 B CN 101980123B CN 2010105306871 A CN2010105306871 A CN 2010105306871A CN 201010530687 A CN201010530687 A CN 201010530687A CN 101980123 B CN101980123 B CN 101980123B
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Abstract
The invention discloses a touch panel device with high touch sensitivity, which comprises a plurality of induction capacitors, a plurality of switches, a plurality of storage capacitors, a differentiate amplifier and a signal processing unit. In an induction time period, the plurality of switches are switched on periodically to transfer the charges of the plurality of induction capacitors to the plurality of storage capacitors periodically. The differentiate amplifier is used for amplifying the voltage difference of two corresponding storage capacitors to generate a touch sense signal. The signal processing unit is used for performing logic OR treatment on the two touch sense signals which are generated at the same panel touch position in different induction time periods and correspond to an alien induction capacitor combination so as to provide a touch position signal.
Description
Patented claim of the present invention for the applicant in the application number of on August 25th, 2009 application be 200910168585.7, denomination of invention divides an application for the application for a patent for invention of " contact surface plate device and its touching localization method of the high touching of tool sensitivity ".
Technical field
The present invention relates to a kind of contact surface plate device and its touching localization method, refer to contact surface plate device and its touching localization method of the high touching of a kind of tool sensitivity especially.
Background technology
In recent years; The electronic product of tool contact surface plate has become the popular product guiding; Utilize contact surface plate as the communication interface between user and the electronic product, can let the user directly control the operation of electronic product, and need not pass through keyboard or slide-mouse through the finger touches pattern.Generally speaking; Contact surface plate is main with resistance-type contact surface plate and capacitor-type touch panel; The resistance-type contact surface plate is located touch position with voltage drop; Capacitor-type touch panel comprises inductance capacitance usually, according to the capacitance variations corresponding to the inductance capacitance of touch points, orients touch position through signal Processing.
Fig. 1 is the structural representation of known contact surface plate device.As shown in Figure 1, contact surface plate device 100 comprises contact surface plate 101, a plurality of line of induction 110, a plurality of inductance capacitance 120, a plurality of storage capacitors 140 and a plurality of comparer 150.Each inductance capacitance 120 can be the equivalent capacity of the corresponding line of induction 110.When contact surface plate 101 is touched; Capacitance corresponding to the inductance capacitance 120 of touch position can increase; Cause power supply Vdd to inject more multi-charge amount to the corresponding line of induction 110; Thereby improving the capacitance voltage of corresponding storage capacitors 140, the comparison process of carrying out capacitance voltages and reference voltage Vref through corresponding comparer 150 again can produce the touching read output signal.Yet along with the increase of contact surface plate size, the equivalent capacity of the line of induction also and then increases, and then the capacitance voltage of storage capacitors is reduced because of the variable quantity that touching causes, even also the touching sensitivity of contact surface plate device reduces.
Summary of the invention
According to embodiments of the invention; The contact surface plate device that it discloses the high touching of a kind of tool sensitivity comprises contact surface plate, first inductance capacitance, first switch, second switch, first storage capacitors, the 3rd switch, second inductance capacitance, the 4th switch, the 5th switch, second storage capacitors, the 6th switch and differential amplifier.First inductance capacitance and second inductance capacitance all are arranged in the contact surface plate.First switch is electrically connected on first inductance capacitance, is used for controlling the electric connection of first inductance capacitance and power supply.Second switch is electrically connected between first inductance capacitance and first storage capacitors.First storage capacitors is used for when the second switch conducting, and accumulation is shifted the electric charge come to produce first voltage by first inductance capacitance.The 3rd switch is electrically connected on first storage capacitors, is used for controlling the discharge running of the stored charge of first storage capacitors.The 4th switch is electrically connected on second inductance capacitance, is used for controlling the electric connection of second inductance capacitance and power supply.The 5th switch is electrically connected between second inductance capacitance and second storage capacitors.Second storage capacitors is used for when the 5th switch conduction, and accumulation is shifted the electric charge come to produce second voltage by second inductance capacitance.The 6th switch is electrically connected on second storage capacitors, is used for controlling the discharge running of the stored charge of second storage capacitors.Differential amplifier is electrically connected on first storage capacitors and second storage capacitors, and the differential processing and amplifying that is used for carrying out first voltage and second voltage is to produce the touching read output signal.
According to embodiments of the invention; The contact surface plate device that it discloses the high touching of a kind of tool sensitivity in addition comprises contact surface plate, first inductance capacitance, second inductance capacitance, the 3rd inductance capacitance, the 4th inductance capacitance, first differential amplifier, second differential amplifier, first switch, second switch, the 3rd switch and the 4th switch.First inductance capacitance, second inductance capacitance, the 3rd inductance capacitance and the 4th inductance capacitance are arranged in the contact surface plate.First differential amplifier comprises first input end, second input end and output terminal, and wherein first input end is electrically connected on first inductance capacitance, and second input end is electrically connected on first switch and second switch, and output terminal is in order to export the first touching read output signal.Second differential amplifier comprises first input end, second input end and output terminal, and wherein first input end is electrically connected on the 3rd switch and the 4th switch, and second input end is electrically connected on the 4th inductance capacitance, and output terminal is in order to export the second touching read output signal.First switch comprises first end and second end, and wherein first end is electrically connected on second inductance capacitance, and second end is electrically connected on second input end of first differential amplifier.Second switch comprises first end and second end, and wherein first end is electrically connected on the 3rd inductance capacitance, and second end is electrically connected on second input end of first differential amplifier.The 3rd switch comprises first end and second end, and wherein first end is electrically connected on second inductance capacitance, and second end is electrically connected on the first input end of second differential amplifier.The 4th switch comprises first end and second end, and wherein first end is electrically connected on the 3rd inductance capacitance, and second end is electrically connected on the first input end of second differential amplifier.
The present invention discloses a kind of contact surface plate device that is used in addition to improve the touching localization method of touching sensitivity, and contact surface plate device has a plurality of sensing elements that are arranged at a plurality of positions of panels.This kind touching localization method comprises: the many groups of scanning two adjacent sensing elements are to produce a plurality of first touching read output signals in regular turn; The many groups of scanning in regular turn two sensing elements of at least one sensing element are at interval touched read output signals to produce a plurality of second; To make logical OR (OR) with the second touching read output signal corresponding to the first touching read output signal of each positions of panels of contact surface plate device and handle, touch read output signals in order to produce a plurality of the 3rd; A plurality of the 3rd touching read output signals are carried out the touch position analysis to produce at least one touch position signal; And output touch position signal.
Description of drawings
For letting above-mentioned and other purposes of the present invention, characteristic, advantage and the embodiment can be more obviously understandable, the explanation of appended accompanying drawing be following:
Fig. 1 is the structural representation of known contact surface plate device;
Fig. 2 is the structural representation of the contact surface plate device of first embodiment of the invention;
Fig. 3 is the work coherent signal oscillogram of the contact surface plate device of Fig. 2, and wherein transverse axis is a time shaft;
Fig. 4 is the structural representation of the contact surface plate device of second embodiment of the invention;
Fig. 5 is the structural representation of the contact surface plate device of third embodiment of the invention;
Fig. 6 is the structural representation of the contact surface plate device of fourth embodiment of the invention;
Fig. 7 is used for the process flow diagram of the touching localization method of contact surface plate device for the present invention.
Wherein, Reference numeral
100,200,400,500,600 contact surface plate devices
101,201,401,501,601 contact surface plates
110,210,410,510,610 lines of induction
120,220,420,520,620 inductance capacitances
140,240,640 storage capacitors
150 comparers
215,415,541,615 first switches
225,425,542,625 second switches
235,426,543,635 the 3rd switches
250,450 differential amplifiers
280,480,580,680 signal processing units
290,490,590,690 storage unit
435,544,641 the 4th switches
436,642 the 5th switches
460 multiplexers
550,650 first differential amplifiers
551,651 second differential amplifiers
560 induction modules
643 the 6th switches
644 minions are closed
900 flow processs
Cs_m, Cs_m+1, Cs_n, Cs_n+1, Cs_n+2, Cs_n+3 inductance capacitance
Cst1 first storage capacitors
Cst2 second storage capacitors
Cst_n, Cst_n+1 storage capacitors
The Diff_i differential amplifier
Diff_i1 first differential amplifier
Diff_i2 second differential amplifier
S910～S940 step
Sc1, Sc4 first control signal
Sc2, Sc5 second control signal
Sc3, Sc6 the 3rd control signal
Sro, Sro_i touch read output signal
Sw1, Sw4 first switch
Sw2, Sw5 second switch
Sw3, Sw6 the 3rd switch
Spos touch position signal
The Treset reset stage
Tsense responds to the period
The Vdd power supply
The Vref reference voltage
Embodiment
Hereinafter is according to contact surface plate device and its touching localization method of the high touching of tool of the present invention sensitivity; The special embodiment that lifts cooperates appended accompanying drawing to elaborate; But the embodiment that is provided not is the scope that contains in order to restriction the present invention, carries out precedence, any execution flow process that is reconfigured by method step and the method flow number of steps is more non-in order to limit it; The method with impartial effect that produces is all the scope that the present invention is contained.
Fig. 2 is the structural representation of the contact surface plate device of first embodiment of the invention.As shown in Figure 2, contact surface plate device 200 comprises contact surface plate 201, a plurality of line of induction 210, a plurality of inductance capacitance 220, a plurality of first switch 215, a plurality of second switch 225, a plurality of storage capacitors 240, a plurality of the 3rd switch 235, a plurality of differential amplifier 250, signal processing unit 280 and storage unit 290.A plurality of lines of induction 210 are arranged in the contact surface plate 201 with a plurality of inductance capacitances 220.Each inductance capacitance 220 can be the equivalent capacity of the corresponding line of induction 210.A plurality of lines of induction 210 comprise a plurality of levels and the vertical line of induction that intermesh.Each first switch 215 is used for controlling the electric connection of power supply Vdd and corresponding inductance capacitance 220.Each second switch 225 is used for controlling the electric connection of corresponding inductance capacitance 220 and corresponding storage capacitors 240.Each the 3rd switch 235 is used for controlling the discharge running of the stored charge of corresponding storage capacitors 240.Each differential amplifier 250 is used for that the capacitance voltage of the two corresponding storage capacitors 240 that are electrically connected on its positive-negative input end is carried out differential processing and amplifying and exports signal processing unit 280 to produce corresponding touching read output signal.Signal processing unit 280 is used for that a plurality of touching read output signals are analoged to digital conversion and handles producing a plurality of digital read output signals, and logical operation processing and the touch position analyzing and processing of carrying out a plurality of digital read output signals are to provide at least one touch position signal Spos.Storage unit 290 is electrically connected on signal processing unit 280, is used for storing a plurality of digital read output signals.
For example, the first switch S w1 is electrically connected between inductance capacitance Cs_n and the power supply Vdd, is used for the electric connection of answering capacitor C s_n and power supply Vdd according to the first control signal Sc1 sense of control.The first switch S w4 is electrically connected between the inductance capacitance Cs_n+1 power supply Vdd, is used for the electric connection of answering capacitor C s_n+1 and power supply Vdd according to the first control signal Sc4 sense of control.Second switch Sw2 is electrically connected between inductance capacitance Cs_n and the storage capacitors Cst_n, is used for the electric connection of answering capacitor C s_n and storage capacitors Cst_n according to the second control signal Sc2 sense of control.Second switch Sw5 is electrically connected between inductance capacitance Cs_n+1 and the storage capacitors Cst_n+1, is used for the electric connection of answering capacitor C s_n+1 and storage capacitors Cst_n+1 according to the second control signal Sc5 sense of control.The 3rd switch S w3 is electrically connected on storage capacitors Cst_n, is used for discharge running according to the stored charge of the 3rd control signal Sc3 control storage capacitors Cst_n.The 3rd switch S w6 is electrically connected on storage capacitors Cst_n+1, is used for discharge running according to the stored charge of the 3rd control signal Sc6 control storage capacitors Cst_n+1.Differential amplifier Diff_i comprises positive input terminal, negative input end and output terminal; Wherein positive input terminal is electrically connected on storage capacitors Cst_n; Negative input end is electrically connected on storage capacitors Cst_n+1, and output terminal is touched read output signal Sro_i to signal processing unit 280 in order to output.In one embodiment, inductance capacitance Cs_n and inductance capacitance Cs_n+1 are adjacent inductance capacitance 220.In another embodiment, at least one inductance capacitance 220 in inductance capacitance Cs_n and inductance capacitance Cs_n+1 interval.
Fig. 3 is the work coherent signal oscillogram of the contact surface plate device of Fig. 2, and wherein transverse axis is a time shaft.In Fig. 3, basipetal signal is respectively the first control signal Sc1, Sc4, the second control signal Sc2, Sc5 and the 3rd control signal Sc3, Sc6.As shown in Figure 3, at induction period T
SenseIn; The 3rd control signal Sc3 and Sc6 are pick-off signal to end the 3rd switch S w3 and Sw6; And the first control signal Sc1 and the second control signal Sc2 are the clock signal of mutual anti-phase; So the periodically mutual conducting of the first switch S w1 and second switch Sw2 is with shifting the electric charge of coming so that storage capacitors Cst_n periodically accumulates inductance capacitance Cs_n.In like manner; The first control signal Sc4 and the second control signal Sc5 also are the clock signal of mutual anti-phase; So the periodically mutual conducting of the first switch S w4 and second switch Sw5 is with shifting the electric charge of coming so that storage capacitors Cst_n+1 periodically accumulates inductance capacitance Cs_n+1.Therefore when being touched corresponding to the positions of panels of inductance capacitance Cs_n, storage capacitors Cst_n can accumulate than multi-charge to produce higher capacitance voltage effectively, makes differential amplifier Diff_i that the highly sensitive touching read output signal of tool Sro_i can be provided according to this.
At reset stage T
ResetIn, the first control signal Sc1 and Sc4 are pick-off signal with by first switch S w1 and the Sw4, and the second control signal Sc2; Sc5 and the 3rd control signal Sc3, Sc6 are Continuity signal with conducting second switch Sw2, Sw5 and the 3rd switch S w3; Sw6; Be used for discharging inductance capacitance Cs_n, Cs_n+1 and storage capacitors Cst_n, the electric charge that Cst_n+1 is stored.In another embodiment, the second control signal Sc2 and Sc5 are at reset stage T
ResetIn be pick-off signal ending second switch Sw2 and Sw5, that is have only storage capacitors Cst_n and Cst_n+1 in reset stage T
ResetIn be released stored electric charge.
Fig. 4 is the structural representation of the contact surface plate device of second embodiment of the invention.As shown in Figure 4, contact surface plate device 400 comprises contact surface plate 401, a plurality of line of induction 410, a plurality of inductance capacitance 420, a plurality of first switch 415, multiplexer 460, second switch 425, the 3rd switch 426, the first storage capacitors Cst1, the second storage capacitors Cst2, the 4th switch 435, the 5th switch 436, differential amplifier 450, signal processing unit 480 and storage unit 490.A plurality of lines of induction 410 are arranged in the contact surface plate 401 with a plurality of inductance capacitances 420.Each inductance capacitance 420 can be the equivalent capacity of the corresponding line of induction 410.Multiplexer 460 comprises a plurality of input ends, first output terminal and second output terminal, and wherein each input end is electrically connected on corresponding inductance capacitance 420, the first output terminals and is electrically connected on second switch 425, the second output terminals and is electrically connected on the 3rd switch 426.Differential amplifier 450 comprises positive input terminal, negative input end and output terminal; Wherein positive input terminal is electrically connected on the first storage capacitors Cst1; Negative input end is electrically connected on the second storage capacitors Cst2, and output terminal is touched read output signal Sro to signal processing unit 480 in order to output.Second switch 425 is electrically connected between the positive input terminal of first output terminal and differential amplifier 450 of multiplexer 460.The 3rd switch 426 is electrically connected between the negative input end of second output terminal and differential amplifier 450 of multiplexer 460.The 4th switch 435 is electrically connected between the positive input terminal and earth terminal of differential amplifier 450.The 5th switch 436 is electrically connected between the negative input end and earth terminal of differential amplifier 450.
A plurality of inductance capacitances 420 are divided into many group two inductance capacitances 420, and each is organized two inductance capacitances 420 and is the adjacent or at least one inductance capacitance 420 in interval.Multiplexer 460 is used in regular turn each being organized two inductance capacitances 420 and is electrically connected to second switch 425 and the 3rd switch 426 respectively.That is when second switch 425 conductings, multiplexer 460 is used for the electric charge of inductance capacitance Cs_n, inductance capacitance Cs_m or all the other corresponding inductance capacitances 420 is transferred to the first storage capacitors Cst1 through first output terminal.In like manner, when 426 conductings of the 3rd switch, multiplexer 460 is used for the electric charge of inductance capacitance Cs_n+1, inductance capacitance Cs_m+1 or all the other corresponding inductance capacitances 420 is transferred to the second storage capacitors Cst2 through second output terminal.In the running of the induction period of contact surface plate device 400; Second switch 425 and the corresponding first switch 415 periodically mutual conductings that electrically connect through multiplexer 460 are with shifting the electric charge of coming so that the first storage capacitors Cst1 periodically accumulates corresponding inductance capacitance 420.Simultaneously, the 3rd switch 426 and another corresponding first switch 415 periodically mutual conductings that electrically connect through multiplexer 460 are with shifting the electric charge of coming so that the second storage capacitors Cst2 periodically accumulates another corresponding inductance capacitance 420.Note that in the running of each induction period, all the other lines of induction 410 that do not have to be electrically connected to second switch 425 or the 3rd switch 426 through multiplexer 460 can be grounded.In the reset stage running of contact surface plate device 400; Second switch 425, the 3rd switch 426, the 4th switch 435 and the 436 equal conductings of the 5th switch; Be used for discharging the first storage capacitors Cst1, the second storage capacitors Cst2 and electrically connect the stored electric charge of two corresponding inductance capacitances 420 of second switches 425 and the 3rd switch 426 through multiplexer 460, all end with two corresponding first switches 415 of three switch 426 through multiplexer 460 electric connection second switches 425 this moment.In another embodiment, second switch 425 and the 3rd switch 426 end in reset stage, that is have only the first storage capacitors Cst1 and the second storage capacitors Cst2 in reset stage, to be released stored electric charge.
Compared to contact surface plate device shown in Figure 2 200; Though contact surface plate device 400 comprises multiplexer 460 in addition; But single differential amplifier 450, two storage capacitors Cst1 only need be set, Cst2 with in order to discharge two switches 435,436 of electric charge; Signal processing unit 480 then only needs single input end receiving the touching read output signal Sro by differential amplifier 450 feed-ins, thus significantly the simplification device circuit structure to reduce cost.In addition, the setting of multiplexer 460 can make the electric charge transfer running of a plurality of inductance capacitances 420 of contact surface plate 401 have more elasticity, so be more suitable for the detection in various touch events.
Fig. 5 is the structural representation of the contact surface plate device of third embodiment of the invention.As shown in Figure 5, contact surface plate device 500 comprises contact surface plate 501, a plurality of line of induction 510, a plurality of inductance capacitance 520, a plurality of first switch 541, a plurality of second switch 542, a plurality of the 3rd switch 543, a plurality of the 4th switch 544, a plurality of first differential amplifier 550, a plurality of second differential amplifier 551, signal processing unit 580 and storage unit 590.A plurality of lines of induction 510 are arranged in the contact surface plate 501 with a plurality of inductance capacitances 520.Each line of induction 510 is electrically connected on power supply Vdd, makes corresponding inductance capacitance 520 be able to charging and generation capacitance voltage.Each inductance capacitance 520 can be the equivalent capacity of the corresponding line of induction 510.Signal processing unit 580 is electrically connected on a plurality of first differential amplifiers 550 and touches read output signal with a plurality of second differential amplifiers 551 to receive a plurality of first touching read output signals and a plurality of second; Be used for analoging to digital conversion and handle producing a plurality of digital read output signals, and logical operation processing and the touch position analyzing and processing of carrying out a plurality of digital read output signals are to provide at least one touch position signal Spos.Storage unit 590 is electrically connected on signal processing unit 580, is used for storing a plurality of digital read output signals.In the circuit structure of contact surface plate device 500; Is an induction module with four inductance capacitances 520 with corresponding first to fourth switch 541～544, first differential amplifier 550 and second differential amplifier 551, so just explanation is as follows with induction module shown in Figure 5 560 with principle of work for the circuit of contact surface plate device 500 relation of coupling.
The first differential amplifier Diff_i1 comprises first input end, second input end and output terminal; Wherein first input end is electrically connected on inductance capacitance Cs_n; Second input end is electrically connected on the first switch S w1 and second switch Sw2, and output terminal is in order to export corresponding touching read output signal to signal processing unit 580.In one embodiment, the first input end of the first differential amplifier Diff_i1 and second input end are respectively positive input terminal and negative input end.The second differential amplifier Diff_i2 comprises first input end, second input end and output terminal; Wherein first input end is electrically connected on the 3rd switch S w3 and the 4th switch S w4; Second input end is electrically connected on inductance capacitance Cs_n+ 3, and output terminal is in order to export corresponding touching read output signal to signal processing unit 580.In one embodiment, the first input end of the second differential amplifier Diff_i2 and second input end are respectively positive input terminal and negative input end.
The first switch S w1 comprises first end and second end, and wherein first end is electrically connected on inductance capacitance Cs_n+1, and second end is electrically connected on second input end of the first differential amplifier Diff_i1.Second switch Sw2 comprises first end and second end, and wherein first end is electrically connected on inductance capacitance Cs_n+2, and second end is electrically connected on second input end of the first differential amplifier Diff_i1.The 3rd switch S w3 comprises first end and second end, and wherein first end is electrically connected on inductance capacitance Cs_n+1, and second end is electrically connected on the first input end of the second differential amplifier Diff_i2.The 4th switch S w4 comprises first end and second end, and wherein first end is electrically connected on inductance capacitance Cs_n+2, and second end is electrically connected on the first input end of the second differential amplifier Diff_i2.Inductance capacitance Cs_n+1 is adjacent to inductance capacitance Cs_n, or with inductance capacitance Cs_n at least one inductance capacitance 520 at interval.Inductance capacitance Cs_n+3 is adjacent to inductance capacitance Cs_n+2, or with inductance capacitance Cs_n+2 at least one inductance capacitance 520 at interval.Inductance capacitance Cs_n+2 is adjacent to inductance capacitance Cs_n+1, or with inductance capacitance Cs_n+1 at least one inductance capacitance 520 at interval.
From the above; The first differential amplifier Diff_i1 is used for inductance capacitance Cs_n and the capacitance voltage of Cs_n+1 are carried out differential processing and amplifying producing corresponding touching read output signal, or is used for inductance capacitance Cs_n is carried out differential processing and amplifying to produce corresponding touching read output signal with the capacitance voltage of Cs_n+2.The second differential amplifier Diff_i2 is used for inductance capacitance Cs_n+3 and the capacitance voltage of Cs_n+2 are carried out differential processing and amplifying producing corresponding touching read output signal, or is used for inductance capacitance Cs_n+3 is carried out differential processing and amplifying to produce corresponding touching read output signal with the capacitance voltage of Cs_n+ 1.
Contact surface plate device 500 is in the first induction period running; The first switch S w1 conducting; And second switch Sw2, the 3rd switch S w3 and the 4th switch S w4 end, so first differential amplifier Diff_i1 this moment is used for the capacitance voltage of inductance capacitance Cs_n and Cs_n+1 is carried out differential processing and amplifying to produce the first touching read output signal.Signal processing unit 580 is carried out simulating to digital conversion of the first touching read output signal and is handled producing the first digital read output signal, and stores the first digital read output signal in storage unit 590.
Contact surface plate device 500 is in the second induction period running; The 4th switch S w4 conducting; And the first switch S w1, second switch Sw2 and the 3rd switch S w3 end, so second differential amplifier Diff_i2 this moment is used for the capacitance voltage of inductance capacitance Cs_n+2 and Cs_n+3 is carried out differential processing and amplifying to produce the second touching read output signal.Signal processing unit 580 is carried out simulating to digital conversion of the second touching read output signal and is handled producing the second digital read output signal, and stores the second digital read output signal in storage unit 590.
Contact surface plate device 500 is in the 3rd induction period running; Second switch Sw2 conducting; And the first switch S w1, the 3rd switch S w3 and the 4th switch S w4 end, so first differential amplifier Diff_i1 this moment is used for the capacitance voltage of inductance capacitance Cs_n and Cs_n+2 is carried out differential processing and amplifying to produce the 3rd touching read output signal.Signal processing unit 580 is carried out simulating to digital conversion of the 3rd touching read output signal and is handled producing the 3rd digital read output signal, and stores the 3rd digital read output signal in storage unit 590.
Contact surface plate device 500 is in the 4th induction period running; The 3rd switch S w3 conducting; And the first switch S w1, second switch Sw2 and the 4th switch S w4 end, so second differential amplifier Diff_i2 this moment is used for the capacitance voltage of inductance capacitance Cs_n+1 and Cs_n+3 is carried out differential processing and amplifying to produce the 4th touching read output signal.Signal processing unit 580 is carried out simulating to digital conversion of the 4th touching read output signal and is handled producing the 4th digital read output signal, and stores the 4th digital read output signal in storage unit 590.
When each induction module of contact surface plate device 500 all after the running of above-mentioned four induction periods of the first induction period to the, can will be stored in the storage unit 590 corresponding to all digital read output signals of contact surface plate 501.Note that in the running of each induction period, need not transmit induced signal and can be grounded with the line of induction 510 that produces the touching read output signal.Again through signal processing unit 580 pair a plurality of digital read output signals carry out touch position analyzing and processing so that at least one touch position signal Spos to be provided thereafter.
Please continue with reference to figure 5; When the positions of panels 571 and 572 of contact surface plate 501 is touched simultaneously; That is generation multi-point touch incident; Can't show touch event at first induction, the first touching read output signal that the period produced, but then can show touch event corresponding to positions of panels 571 in the 3rd induction the 3rd touching read output signal that the period produced corresponding to positions of panels 571.Perhaps; When the positions of panels 571 and 573 of contact surface plate 501 is touched simultaneously; Can't show touch event at the 3rd induction the 3rd touching read output signal that the period produced, but then can show touch event corresponding to positions of panels 571 in first induction, the first touching read output signal that the period produced corresponding to positions of panels 571.So, handle running through the logical OR of signal processing unit 580, contact surface plate device 500 can effectively detect the various touch events corresponding to positions of panels 571, in other words, can significantly improve touching sensitivity.
Fig. 6 is the structural representation of the contact surface plate device of fourth embodiment of the invention.As shown in Figure 6, contact surface plate device 600 comprises that contact surface plate 601, a plurality of line of induction 610, a plurality of inductance capacitance 620, a plurality of first switch 615, a plurality of second switch 625, a plurality of storage capacitors 640, a plurality of the 3rd switch 635, a plurality of the 4th switch 641, a plurality of the 5th switch 642, a plurality of the 6th switch 643, a plurality of minion close 644, a plurality of first differential amplifier 650, a plurality of second differential amplifier 651, signal processing unit 680 and storage unit 690.A plurality of lines of induction 610 are arranged in the contact surface plate 601 with a plurality of inductance capacitances 620.Each inductance capacitance 620 can be the equivalent capacity of the corresponding line of induction 610.Signal processing unit 680 is same as signal processing unit shown in Figure 5 580 and storage unit 590 with the functional operation of storage unit 690, so repeat no more.In the circuit structure of contact surface plate device 600; Still with four inductance capacitances 620 and corresponding first to the 3rd switch 615; 625; 635, four storage capacitors 640, the 4th are closed 641～644, first differential amplifier 650 and second differential amplifier 651 is an induction module to minion, for example induction module 660 shown in Figure 6.The circuit structure of induction module 660 is similar to induction module shown in Figure 5 560; Main difference is to comprise in addition first switch 615, second switch 625, storage capacitors 640 and the 3rd switch 635; That is the 4th close the functional operation that 641～644 functional operation is same as first to fourth switch 541～544 shown in Figure 5, below the circuit working principle of the induction module 660 of general introduction contact surface plate device 600 to minion.
When induction module 660 operates on induction during the period; Need be used for transmitting first switch 615 and second switch 625 periodically mutual conductings that induced signal is electrically connected with the line of induction 610 that produces the touching read output signal, with shifting the electric charge of coming so that corresponding storage capacitors 640 is periodically accumulated corresponding inductance capacitance 620.Note that in the running of each induction period, need not transmit induced signal and can be grounded with the line of induction 610 that produces the touching read output signal.When induction module 660 operated on reset stage, each the 3rd switch 635 conducting of induction module 660 were in order to discharging the stored electric charge of corresponding storage capacitors 640 and corresponding inductance capacitance 620, or only discharged the stored electric charge of corresponding storage capacitors 640.Therefore, first to the 3rd switch 615,625,635 is same as first to the 3rd switch 215,225,235 shown in Figure 2 and the functional operation of storage capacitors 240 with the functional operation of storage capacitors 640.From the above, the functional operation of contact surface plate device 600 can be considered the complex functionality running of contact surface plate device 200 and contact surface plate device 500, so repeat no more.
Fig. 7 is used for the process flow diagram of the touching localization method of contact surface plate device for the present invention.Contact surface plate device comprises a plurality of sensing elements corresponding to a plurality of positions of panels, for example a plurality of inductance capacitances.As shown in Figure 7, the flow process 900 of touching localization method comprises the following step:
Step S910: the many groups of scanning two adjacent sensing elements are to produce a plurality of first touching read output signals in regular turn;
Step S915: store a plurality of first touching read output signals;
Step S920: the many groups of scanning in regular turn two sensing elements of at least one sensing element are at interval touched read output signals to produce a plurality of second;
Step S925: store a plurality of second touching read output signals;
Step S930: will make logical OR (OR) with the second touching read output signal corresponding to the first touching read output signal of each positions of panels of contact surface plate device and handle, and touch read output signals in order to produce a plurality of the 3rd;
Step S935: a plurality of the 3rd touching read output signals are carried out the touch position analysis to produce at least one touch position signal; And
Step S940: output touch position signal.
In the flow process 900 of touching localization method; The many groups of the described scanning in regular turn of step S910 two adjacent sensing elements comprise each induced signal of organizing two adjacent sensing elements are carried out differential processing and amplifying to produce the corresponding first touching read output signal to produce a plurality of first touching read output signals.The many groups of the described scanning in regular turn of step S920 at interval two sensing elements of at least one sensing element to produce a plurality of second touching read output signals, comprise to each group at interval the induced signal of two sensing elements of at least one sensing element carry out differential processing and amplifying to produce the corresponding second touching read output signal.From the above; Various touch events corresponding to each positions of panels of contact surface plate device; All can detect according to the corresponding first touching read output signal and the second touching read output signal; Even also can accurately detect touch event, therefore can significantly improve the touching sensitivity of contact surface plate device corresponding to each positions of panels so the multi-point touch incident takes place.
In sum; Contact surface plate device of the present invention and its touching localization method; Utilize capacitance charge periodically to shift operating mode to improve touching sensitivity; Or the two touching read output signals corresponding to different sensing element combination of each panel touch position are made logical OR handle, in order in various touch events, highly sensitive touch position signal is provided.
Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (6)
1. the contact surface plate device of the high touching of tool sensitivity is characterized in that it comprises:
One contact surface plate;
One first inductance capacitance is arranged in this contact surface plate;
One second inductance capacitance is arranged in this contact surface plate;
One the 3rd inductance capacitance is arranged in this contact surface plate;
One the 4th inductance capacitance is arranged in this contact surface plate;
One first differential amplifier comprises a first input end, one second input end and an output terminal, and wherein this first input end is electrically connected on this first inductance capacitance, and this output terminal is in order to export one first touching read output signal;
One second differential amplifier comprises a first input end, one second input end and an output terminal, and wherein this second input end is electrically connected on the 4th inductance capacitance, and this output terminal is in order to export one second touching read output signal;
One first switch comprises one first end and one second end, and wherein this first end is electrically connected on this second inductance capacitance, and this second end is electrically connected on second input end of this first differential amplifier;
One second switch comprises one first end and one second end, and wherein this first end is electrically connected on the 3rd inductance capacitance, and this second end is electrically connected on second input end of this first differential amplifier;
One the 3rd switch comprises one first end and one second end, and wherein this first end is electrically connected on this second inductance capacitance, and this second end is electrically connected on the first input end of this second differential amplifier; And
One the 4th switch comprises one first end and one second end, and wherein this first end is electrically connected on the 3rd inductance capacitance, and this second end is electrically connected on the first input end of this second differential amplifier;
In the first induction period, this first switch conduction, and this second switch, the 3rd switch and the 4th switch end; In the second induction period, the 4th switch conduction, and this first switch, this second switch and the 3rd switch end; In the 3rd induction period, this second switch conducting, and this first switch, the 3rd switch and the 4th switch end; In the 4th induction period, the 3rd switch conduction, and this first switch, this second switch and the 4th switch end.
2. contact surface plate device as claimed in claim 1 is characterized in that other comprises:
One the 5th switch is electrically connected on this first inductance capacitance, is used for controlling the electric connection of this first inductance capacitance and a power supply;
One the 6th switch is electrically connected between the first input end of this first inductance capacitance and this first differential amplifier;
One first storage capacitors is electrically connected on the 6th switch, is used for when the 6th switch conduction, and the electric charge of coming is shifted in accumulation by this first inductance capacitance;
One minion is closed, and is electrically connected on this first storage capacitors, is used for controlling the discharge running of the stored charge of this first storage capacitors;
One octavo is closed, and is electrically connected on this second inductance capacitance, is used for controlling the electric connection of this second inductance capacitance and this power supply;
One the 9th switch comprises one first end and one second end, and wherein this first end is electrically connected on this second inductance capacitance, and this second end is electrically connected on first end of this first switch and first end of the 3rd switch;
One second storage capacitors is electrically connected on second end of the 9th switch, is used for when the 9th switch conduction, and the electric charge of coming is shifted in accumulation by this second inductance capacitance;
The tenth switch is electrically connected on this second storage capacitors, is used for controlling the discharge running of the stored charge of this second storage capacitors;
The 11 switch is electrically connected on the 3rd inductance capacitance, is used for controlling the electric connection of the 3rd inductance capacitance and this power supply;
One twelvemo is closed, and comprises one first end and one second end, and wherein this first end is electrically connected on the 3rd inductance capacitance, and this second end is electrically connected on first end of this second switch and first end of the 4th switch;
One the 3rd storage capacitors is electrically connected on second end that this twelvemo is closed, and is used for when this twelvemo is closed conducting, and the electric charge of coming is shifted in accumulation by the 3rd inductance capacitance;
The 13 switch is electrically connected on the 3rd storage capacitors, is used for controlling the discharge running of the stored charge of the 3rd storage capacitors;
The 14 switch is electrically connected on the 4th inductance capacitance, is used for controlling the electric connection of the 4th inductance capacitance and this power supply;
The 15 switch is electrically connected between second input end of the 4th inductance capacitance and this second differential amplifier;
One the 4th storage capacitors is electrically connected on the 15 switch, is used for when the 15 switch conduction, and the electric charge of coming is shifted in accumulation by the 4th inductance capacitance; And
One sixteenmo closes, and is electrically connected on the 4th storage capacitors, is used for controlling the discharge running of the stored charge of the 4th storage capacitors;
In the above-mentioned first, second, third and the 4th induction period, the 5th switch and the 6th switch periods interaction conducting, this minion is closed and is ended; This octavo is closed and the 9th switch periods interaction conducting, and the tenth switch ends; The 11 switch and this twelvemo are closed periodically mutual conducting, and the 13 switch ends; The 14 switch and the 15 switch periods interaction conducting, this sixteenmo are closed and are ended; At reset stage, this minion is closed conducting, and the 5th switch ends; The tenth switch conduction, this octavo close and end; The 13 switch conduction, the 11 switch ends; This sixteenmo closes conducting, and the 14 switch ends.
3. contact surface plate device as claimed in claim 1 is characterized in that other comprises:
One signal processing unit; Be electrically connected on this first differential amplifier and this second differential amplifier; Be used for to different induction this first touching read output signal that the period produced and this second touching read output signal; Analog to digital conversion and handle producing a plurality of digital read output signals, and according to said digital read output signal to produce at least one touch position signal; And
One storage unit is electrically connected on this signal processing unit, is used for storing said digital read output signal.
4. contact surface plate device as claimed in claim 1 is characterized in that, this second inductance capacitance is adjacent to this first inductance capacitance.
5. contact surface plate device as claimed in claim 1 is characterized in that the 4th inductance capacitance is adjacent to the 3rd inductance capacitance.
6. contact surface plate device as claimed in claim 1 is characterized in that, the 3rd inductance capacitance is adjacent to this second inductance capacitance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010105306871A CN101980123B (en) | 2009-08-25 | 2009-08-25 | Touch panel device with high touch sensitivity and touch positioning method thereof |
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| CN2010105306871A CN101980123B (en) | 2009-08-25 | 2009-08-25 | Touch panel device with high touch sensitivity and touch positioning method thereof |
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| CN2009101685857A Division CN101634924B (en) | 2009-08-25 | 2009-08-25 | Touch panel device with high touch sensitivity and touch positioning method thereof |
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| CN101980123A CN101980123A (en) | 2011-02-23 |
| CN101980123B true CN101980123B (en) | 2012-07-04 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI459272B (en) * | 2011-10-17 | 2014-11-01 | Raydium Semiconductor Corp | Capacitive touch display apparatus |
| KR101895883B1 (en) * | 2011-11-09 | 2018-09-10 | 삼성전자 주식회사 | Method and apparatus for improving touch sensitivity of touchscreen panel |
| CN103049160B (en) * | 2013-01-25 | 2016-04-06 | 东莞市亚星半导体有限公司 | A kind of liquid crystal capacitance screen of multiple point touching |
| CN103455228B (en) * | 2013-08-30 | 2016-10-19 | 珠海中慧微电子有限公司 | Automatically induction point and the method for capacitance touch screen driving voltage load time are calculated |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1952863A (en) * | 2005-10-18 | 2007-04-25 | 鸿富锦精密工业（深圳）有限公司 | Touch type induction system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1952863A (en) * | 2005-10-18 | 2007-04-25 | 鸿富锦精密工业（深圳）有限公司 | Touch type induction system |
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