CN101685364A - Device and method for sensing touch panel - Google Patents
Device and method for sensing touch panel Download PDFInfo
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- CN101685364A CN101685364A CN200810148849A CN200810148849A CN101685364A CN 101685364 A CN101685364 A CN 101685364A CN 200810148849 A CN200810148849 A CN 200810148849A CN 200810148849 A CN200810148849 A CN 200810148849A CN 101685364 A CN101685364 A CN 101685364A
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- 239000003990 capacitor Substances 0.000 claims abstract description 19
- 230000010354 integration Effects 0.000 claims description 17
- 230000000630 rising effect Effects 0.000 claims description 12
- 239000000725 suspension Substances 0.000 claims description 8
- 230000003321 amplification Effects 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 description 7
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- 238000010586 diagram Methods 0.000 description 3
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- 230000005684 electric field Effects 0.000 description 1
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Abstract
The present invention provides a device and method for sensing a touch panel, wherein any touch point of the touch panel is electrically connected with a touch capacitor. The sensing method comprises:integral amplifying the charge energy of the touch capacitor, obtaining a standard potential value in the total time cycle, wherein the total time cycle is the summation of a standard time cycle andan additional time cycle; and counting the additional time cycle in system frequency after the standard time cycle in the total time cycle, so as to determine the touch point.
Description
Technical field
The application relates to a kind of sensing device and method, particularly relates to a kind of sensing device and method of touch panel.
Background technology
The capacitance touching control induction technology that is applied at present on the contact panel adopts analog/digital (A/D) switch technology to come the variation of electric capacity current potential is resolved mostly.For instance, very limited by the electric charge of finger when finger touch arrives circuit board or face glass, and not by the electric charge separated into two parts of finger: a part is radiated in the space, and another part is coupled directly to integrator and multiplying arrangement.
The signal potential that is coupled to integrator and multiplying arrangement will form the touch potential value of this touch point, native state potential value when this touch potential value and this touch point are not touched compares, and the ratio of this touch potential value and this native state potential value is about 80%～90% as can be known.That is to say that the difference between this touch potential value and this native state potential value only accounts for 10%～20% of this native state potential value.
Hence one can see that, via after the A/D conversion, the active data scope also have only the A/D change-over circuit figure place 10%～20%.Therefore, when running into the not good situation of the characteristic that touches capacitor board, cause responding to the resolution variation easily, if but but therefore will improve resolution and must improve the figure place of A/D change-over circuit or increase extra circuit, this measure will cause the design cost of circuit to increase.
Secondly, when the dimensioned area of panel was big, the amount of touch point also can increase, under the situation that adopts Analog-to-Digital Conversion Technology, and the long fluency that can have a strong impact on use sweep time.
At last, for large size panel, owing to be distributed in bigger than the equivalent line impedance that electric capacity contained of far-end, therefore when sending a signal to each equivalent capacity again, the energy that electric capacity obtained that is positioned at distal-most end is lower than the electric capacity of near-end, so the touch sensitivity of large size panel can be affected significantly.
In order to improve the problems referred to above, US 2007/0247172 A1 application has proposed a kind of touching device, but it has following shortcoming:
(1) button for (GND) over the ground charging again by going to another electric capacity by bond charge to carry out current potential relatively, need carry out electric charge and shift;
(2) do not mention how carrying out counting mode;
(3) only one key is charged over the ground; And
(4) current potential is not carried out comparing after integration amplifies again, therefore required charging rate is slower.
Summary of the invention
Therefore, be necessary to conceive a kind of sensing device and method that need not to utilize the touch panel of A/D switch technology.
According to above-mentioned conception, the application has proposed a kind of sensing device and method of touch panel, wherein the arbitrary touch point on this touch panel is electrically connected to touch electric capacity, this method for sensing comprises the following steps: that the energy of a charge that this touch electric capacity is had is carried out integration to be amplified, in cycle T.T., to obtain the standard electric place value, should it be the summation in cycle standard time and cycle extra time in cycle T.T. wherein; And in this cycle T.T., after this cycle standard time, with system frequency to this of cycle count, to determine this touch point extra time.
According to above-mentioned conception, the application has further proposed a kind of sensing device of touch panel, wherein the arbitrary touch point on this touch panel is electrically connected to touch electric capacity, this sensing device comprises: integrating amplifier, it has first input end, second input end and output terminal, this first input end is the output terminal that is electrically coupled to this touch electric capacity, this second input end is electrically coupled to ground, wherein this integrating amplifier energy of a charge that this touch electric capacity is had carries out integration and amplifies, with acquisition standard electric place value in cycle T.T., and should it be the summation in cycle standard time and cycle extra time in cycle T.T.; Comparer, it has non-inverting input, inverting input and output terminal, and this non-inverting input is this output terminal that is electrically connected on this integrating amplifier, and this inverting input receives this standard electric place value; And counter, it is electrically coupled to this output terminal of this comparer, and wherein this counter is controlled by this comparer, and in this cycle T.T., after this cycle standard time, with system frequency to this cycle count extra time (counting), to determine this touch point.
The application adopts the reference potential of comparer to determine whether system begins to start high-speed counting, because all touch the electric capacity charging level and all are as the criterion with the reference potential of comparer, therefore the formed current potential of each touch electric capacity is also identical, the sensitivity that makes on the touch panel all touch electric capacity all reaches consistent, in addition, because system adopts the high-speed counting mode to count, make resolution to increase substantially.
More in depth understand the application by following diagram and detailed description:
Description of drawings
Fig. 1: the circuit diagram of the preferred embodiment of the sensing device of the touch panel that the application proposed; And
Fig. 2: under originate mode and scan pattern, the contrast of the current potential sequential of the energy of a charge that integrating capacitor is stored is schemed among Fig. 1.
Embodiment
The application's main conception is not adopt analog/digital (A/D) switch technology, amplify and only carry out integration by each touch electric capacity to touch panel, utilize frequency at a high speed that the spent time of integration is counted again, whether be touched to determine the touch point on the touch panel.
See also Fig. 1, it is the circuit diagram of the preferred embodiment of the sensing device of the touch panel that the application proposed, and wherein sensing device 1 mainly comprises pulse generator 10 (being representative in this embodiment with the oscillator), switches set 11, integrating amplifier 12, comparer 13, counter 14 and storer 15.
Arbitrary touch point of not drawing on the touch panel in the drawings all is electrically connected to touch electric capacity, though in Fig. 1, only drawn single touch electric capacity 16 as representative, but those skilled in the art know that the sensing device 1 of Fig. 1 can be responsible for definite work of each touch point on the whole touch panel under the situation of using extra multiplexer.
The configuration mode of the sensing device of the touch panel that the application proposed is as follows:
Comparer 13 has non-inverting input, inverting input and output terminal, and this non-inverting input is this output terminal that is electrically connected on integrating amplifier 12, this inverting input acceptance criteria potential value Vref.
In the present embodiment, integrating amplifier 12 is made of integrating capacitor 121 and amplifier 122, wherein amplifier 122 has first input end, second input end and output terminal, this first input end is the input end that is electrically coupled to integrating capacitor 121, this second input end is electrically coupled to ground, and this output terminal is the output terminal that is electrically coupled to integrating capacitor 121.
Switches set 11 has first end, second end and the 3rd end, switches set 11 is electrically coupled to and touches between electric capacity 16 and the integrating amplifier 12, this first end is to be electrically coupled to the output terminal that touches electric capacity 16, this second end is electric suspension joint this first input end in integrating amplifier 12, and the 3rd end electricity suspension joint is in ground.
In the present embodiment, this switches set is made of first switch S 1 and second switch S2.First switch S 1 has first end and second end, and this first end is to be electrically coupled to the output terminal that touches electric capacity 16, and this second end electricity suspension joint is in ground.Second switch S2 has first end and second end, and this first end is to be electrically coupled to the output terminal that touches electric capacity 16, and this second end is electric suspension joint this first input end in integrating amplifier 12.
Finish the application's method for sensing, sensing device 1 can be divided into following two kinds of patterns when work:
(1) originate mode
10 pairs of pulse generators touch electric capacity 16 input continuous impulses, and each pulse in this continuous impulse all has rising edge and negative edge.
On the other hand, when integrating capacitor 121 has just begun to be recharged, counter 14 begins counting with standard frequency, up in integrating capacitor 121 integrates when equaling the energy of a charge of this standard electric place value Vref, comparer 13 output low level signals, make counter 14 stop counting, this moment, storer 15 can be noted this cycle standard time.
Afterwards, switch S 1 and S2 conducting simultaneously, the current potential of integrating capacitor 121 and touch electric capacity 16 then makes zero simultaneously.
(2) scan pattern
If determine whether touch panel is touched, then need carry out scan pattern, utilize 10 pairs of pulse generators to touch this continuous impulse that electric capacity 16 inputs have this rising edge and this negative edge equally, pass through the action of switches set 11 too, with this rising edge of only each pulse in this continuous impulse by during touching electric capacity 16, the energy of a charge that touch electric capacity 16 is had utilizes integrating amplifier 12 to carry out the integration amplification, and this negative edge of only each pulse in this continuous impulse is by during touching electric capacity 16, is discharged to ground to touching the energy of a charge that electric capacity 16 had.And then in another time cycle, in integrating capacitor 121, obtain to equal the energy of a charge of this standard electric place value Vref once more.
Because the touch point that is electrically connected with touch electric capacity 16 is when being touched, it is big that capacitance can become, therefore, only this rising edge of each pulse in this continuous impulse passes through to touch during the electric capacity 16 once more, when the energy of a charge that touch electric capacity 16 is had utilizes integrating amplifier 12 to carry out the integration amplification, want the spent time cycle of energy of a charge that same acquisition equals this standard electric place value Vref in integrating capacitor 121 to be bound to increase; This section time cycle is defined as cycle T.T., should be the summation in aforesaid standards time cycle and cycle extra time in cycle T.T. wherein.
Be with the originate mode difference, in scan pattern, counter 14 is in this cycle T.T., after this cycle standard time, just this cycle extra time is counted with system frequency, because this system frequency is the frequency of extremely high frequency with respect to the aforesaid standards frequency, so sensing device can utilize the resolution higher than prior art to determine that this touch point is touched really.
See also Fig. 2, its be among Fig. 1 under originate mode and scan pattern, the current potential sequential of the energy of a charge that integrating capacitor is stored contrast figure.As seen from Figure 2, under originate mode, counter 14 begins counting with this standard frequency FL, up in integrating capacitor 121 integrates when equaling the energy of a charge of this standard electric place value Vref, need expend this standard time period T-No Touch altogether.
And under scan pattern, want in integrating capacitor 121 spent this T.T. period T-Touch of the same energy of a charge that obtains to equal this standard electric place value Vref necessarily greater than this standard time period T-No Touch; That is to say that this cycle T.T. is the summation of this standard time period T-No Touch and this extra time of period T-C, counter 14 is then counted in period T-C in this extra time with this system frequency FH, determines this touch point by this.
In sum, the application utilizes outside integration current potential to compare with the reference potential that sets up on their own, when outside integration current potential reaches reference potential, to note duration of charging or beginning counts with fast frequency and stops gate time, not only save system design cost and power consumption, also can improve the resolution of system identification touch controlled key.Compare with the prior art that adopts the A/D switch technology, the application has following advantage:
(1) counting mode that the application adopted is not the A/D conversion, so power consumption is lower;
(2) because of the system counts level is the comparator reference level, so all touch electric capacity can obtain identical current potential field to detect;
(3) the application can be applicable to large size panel and the detecting of many buttons;
(4) when the application is applied to contact panel, owing to the level of comparer can be set flexibly, so the design flexibility of electric capacity pattern is bigger; And
(5) the application is simple in structure, electric field is even, has high resolving power.
On the other hand, compare with the touching device of aforementioned US 2007/0247172 A1 application, the application further has following advantage:
(1) the application need not to carry out the electric charge transfer, but directly carries out the charge integration charging;
(2) the application adopts the high-speed counting pattern, can increase substantially analytic ability;
(3) the suitable panel of the application is a digit group type, can be applicable to the detecting of large-scale panel touch detection and multikey; And
(4) the application must utilize integrator to carry out comparing current potential again after integration amplifies, and charging rate is very fast.
The application can carry out various variations and change by those skilled in the art, yet does not break away from the scope as the claims protection.
Claims (9)
1. the method for sensing of a touch panel, the arbitrary touch point on the wherein said touch panel is electrically connected to touch electric capacity, and described method for sensing comprises the following steps:
(A) energy of a charge that described touch electric capacity is had carries out the integration amplification, and to obtain the standard electric place value in cycle T.T., wherein said cycle T.T. is the summation in cycle standard time and cycle extra time; And
(B) in described cycle T.T., after described cycle standard time, with system frequency to described extra time of cycle count, to determine described touch point.
2. method for sensing as claimed in claim 1 wherein further comprises the following steps: before in step (A)
To described touch electric capacity input continuous impulse, each pulse in the described continuous impulse all has rising edge and negative edge;
Only the described rising edge of each pulse in described continuous impulse by described touch electric capacity during, the energy of a charge that described touch electric capacity is had carries out integration and amplifies, and then obtains described standard electric place value in described cycle standard time;
With standard frequency to described standard time cycle count;
The energy of a charge that described touch electric capacity is had makes zero; And
Touch described touch point.
3. method for sensing as claimed in claim 2 wherein further comprises the following steps: in step (A)
Described touch electric capacity is imported described continuous impulse, and each pulse in the described continuous impulse all has described rising edge and described negative edge; And
Only the described rising edge of each pulse in described continuous impulse by described touch electric capacity during, the energy of a charge that described touch electric capacity is had carries out integration and amplifies, and then obtains described standard electric place value in described cycle T.T..
4. the sensing device of a touch panel, the arbitrary touch point on the wherein said touch panel is electrically connected to touch electric capacity, and described sensing device comprises:
Integrating amplifier, it has first input end, second input end and output terminal, described first input end is the output terminal that is electrically coupled to described touch electric capacity, described second input end is electrically coupled to ground, the energy of a charge that wherein said integrating amplifier is had described touch electric capacity carries out integration and amplifies, in cycle T.T., obtaining the standard electric place value, and the summation that is cycle standard time and cycle extra time of described cycle T.T.;
Comparer, it has non-inverting input, inverting input and output terminal, and described non-inverting input is the described output terminal that is electrically connected on described integrating amplifier, and described inverting input receives described standard electric place value; And
Counter, it is electrically coupled to the described output terminal of described comparer, and wherein said counter is controlled by described comparer, and in described cycle T.T., after described cycle standard time, with system frequency to described extra time of cycle count, to determine described touch point.
5. sensing device as claimed in claim 4, wherein said integrating amplifier comprises:
Integrating capacitor, it has input end and output terminal; And
Amplifier, it has first input end, second input end and output terminal, described first input end is the described input end that is electrically coupled to described integrating capacitor, and described second input end is electrically coupled to ground, and described output terminal is the described output terminal that is electrically coupled to described integrating capacitor.
6. sensing device as claimed in claim 4 further comprises:
Pulse generator, it is electrically coupled to the input end of described touch electric capacity, produces continuous impulse and it is imported described touch electric capacity, and each pulse in the wherein said continuous impulse all has rising edge and negative edge; And
Switches set, it has first end, second end and the 3rd end, described switches set is electrically coupled between described touch electric capacity and the described integrating amplifier, described first end is the output terminal that is electrically coupled to described touch electric capacity, described second end is the described first input end of electric suspension joint in described integrating amplifier, described the 3rd end electricity suspension joint is in ground, and wherein said switches set can be switched, and only allows the described rising edge of each pulse in the described continuous impulse amplify to carry out integration by described touch electric capacity.
7. sensing device as claimed in claim 6, wherein said pulse generator is an oscillator.
8. sensing device as claimed in claim 6, wherein said switches set further comprises:
First switch, it has first end and second end, and described first end is the output terminal that is electrically coupled to described touch electric capacity, and described second end electricity suspension joint is in ground; And
Second switch, it has first end and second end, and described first end is the output terminal that is electrically coupled to described touch electric capacity, and described second end is the described first input end of electric suspension joint in described integrating amplifier.
9. sensing device as claimed in claim 4 further comprises:
Storer, it is electrically coupled to described counter, stores the count value of described counter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008101488498A CN101685364B (en) | 2008-09-27 | 2008-09-27 | Device and method for sensing touch panel |
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| CN2008101488498A CN101685364B (en) | 2008-09-27 | 2008-09-27 | Device and method for sensing touch panel |
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| CN101685364A true CN101685364A (en) | 2010-03-31 |
| CN101685364B CN101685364B (en) | 2012-03-07 |
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| CN102541367A (en) * | 2010-12-29 | 2012-07-04 | 比亚迪股份有限公司 | Capacitance-type touch control detection circuit, detection device and detection method |
| CN102782626A (en) * | 2010-04-30 | 2012-11-14 | 密克罗奇普技术公司 | Capacitive touch system using both self and mutual capacitance |
| CN102955589A (en) * | 2011-08-18 | 2013-03-06 | 宸鸿光电科技股份有限公司 | Touch-control panel control system and touch-control panel control method |
| CN103308776A (en) * | 2013-05-08 | 2013-09-18 | 漳州宝发光电科技有限公司 | Testing circuit of capacitive screen and testing method thereof |
| TWI414978B (en) * | 2010-06-24 | 2013-11-11 | Au Optronics Corp | Method for correcting and recording initial touch points on touch panel |
| CN103748540A (en) * | 2011-04-05 | 2014-04-23 | 赛普拉斯半导体公司 | Active integrator for capacitive sense array |
| CN104765486A (en) * | 2013-12-27 | 2015-07-08 | 辛纳普蒂克斯显像装置株式会社 | Touch detecting device and semiconductor device |
| CN105379120A (en) * | 2013-06-12 | 2016-03-02 | 密克罗奇普技术公司 | Capacitive proximity detection using delta-sigma conversion |
| WO2016105896A1 (en) * | 2014-12-22 | 2016-06-30 | Microsoft Technology Licensing, Llc | Active matrix capacitive touch sensor |
| CN103748540B (en) * | 2011-04-05 | 2016-11-30 | 谱瑞科技股份有限公司 | Active integrator for capacitive sensing array |
| CN107943337A (en) * | 2016-10-12 | 2018-04-20 | 远翔科技股份有限公司 | The charging correction system of touch pad and its bearing calibration |
| CN109445628A (en) * | 2018-10-17 | 2019-03-08 | 湖南锐阳电子科技有限公司 | The reading circuit and its large scale capacitance touching control screen of large scale capacitance touching control screen |
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| CN100573427C (en) * | 2005-11-12 | 2009-12-23 | 鸿富锦精密工业（深圳）有限公司 | Touch type inductor |
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2008
- 2008-09-27 CN CN2008101488498A patent/CN101685364B/en not_active Expired - Fee Related
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| CN102782626A (en) * | 2010-04-30 | 2012-11-14 | 密克罗奇普技术公司 | Capacitive touch system using both self and mutual capacitance |
| CN102782626B (en) * | 2010-04-30 | 2016-03-02 | 密克罗奇普技术公司 | Use self-capacitance and the capacitive touch system both mutual capacitance |
| TWI414978B (en) * | 2010-06-24 | 2013-11-11 | Au Optronics Corp | Method for correcting and recording initial touch points on touch panel |
| CN102541367A (en) * | 2010-12-29 | 2012-07-04 | 比亚迪股份有限公司 | Capacitance-type touch control detection circuit, detection device and detection method |
| CN102541367B (en) * | 2010-12-29 | 2015-11-25 | 比亚迪股份有限公司 | A kind of capacitance-type touch control detection circuit, pick-up unit |
| CN103748540A (en) * | 2011-04-05 | 2014-04-23 | 赛普拉斯半导体公司 | Active integrator for capacitive sense array |
| CN103748540B (en) * | 2011-04-05 | 2016-11-30 | 谱瑞科技股份有限公司 | Active integrator for capacitive sensing array |
| CN102955589A (en) * | 2011-08-18 | 2013-03-06 | 宸鸿光电科技股份有限公司 | Touch-control panel control system and touch-control panel control method |
| CN103308776A (en) * | 2013-05-08 | 2013-09-18 | 漳州宝发光电科技有限公司 | Testing circuit of capacitive screen and testing method thereof |
| CN103308776B (en) * | 2013-05-08 | 2015-12-09 | 福建宝发光电科技集团有限公司 | A kind of test circuit of capacitance plate and method of testing thereof |
| CN105379120A (en) * | 2013-06-12 | 2016-03-02 | 密克罗奇普技术公司 | Capacitive proximity detection using delta-sigma conversion |
| CN105379120B (en) * | 2013-06-12 | 2019-05-17 | 尼奥荣恩有限公司 | It is detected using Δ/Σ conversion capacitive proximity |
| US10209835B2 (en) | 2013-12-27 | 2019-02-19 | Synaptics Japan Gk | Touch detecting device and semiconductor device |
| CN104765486A (en) * | 2013-12-27 | 2015-07-08 | 辛纳普蒂克斯显像装置株式会社 | Touch detecting device and semiconductor device |
| CN104765486B (en) * | 2013-12-27 | 2020-09-15 | 辛纳普蒂克斯日本合同会社 | Touch detection device and semiconductor device |
| US9436338B2 (en) | 2014-12-22 | 2016-09-06 | Microsoft Technology Licensing, Llc | Active matrix capacitive touch sensor |
| WO2016105896A1 (en) * | 2014-12-22 | 2016-06-30 | Microsoft Technology Licensing, Llc | Active matrix capacitive touch sensor |
| CN107943337A (en) * | 2016-10-12 | 2018-04-20 | 远翔科技股份有限公司 | The charging correction system of touch pad and its bearing calibration |
| CN109445628A (en) * | 2018-10-17 | 2019-03-08 | 湖南锐阳电子科技有限公司 | The reading circuit and its large scale capacitance touching control screen of large scale capacitance touching control screen |
| CN109445628B (en) * | 2018-10-17 | 2019-09-27 | 湖南锐阳电子科技有限公司 | The reading circuit and its large scale capacitance touching control screen of large scale capacitance touching control screen |
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| CN101685364B (en) | 2012-03-07 |
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