CN102662518A - System and method for controlling signal noise ratio - Google Patents
System and method for controlling signal noise ratio Download PDFInfo
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- CN102662518A CN102662518A CN2012100951239A CN201210095123A CN102662518A CN 102662518 A CN102662518 A CN 102662518A CN 2012100951239 A CN2012100951239 A CN 2012100951239A CN 201210095123 A CN201210095123 A CN 201210095123A CN 102662518 A CN102662518 A CN 102662518A
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Abstract
The invention relates to a system for controlling the signal noise ratio and aims to reduce noise interference. The system for controlling the signal noise ratio comprises a touch sensor, a touch integrated circuit and a level shifter. The touch sensor is driven by a driving signal and outputs analog signals according to touched conditions. The touch integrated circuit generates the driving signal and provides differential voltage according to the analog signals. The level shifter adjusts voltage level of the driving signal according to voltage level of the differential voltage.
Description
Technical field
The invention relates to a kind of method and apparatus of contact panel, and particularly relevant for a kind of method and apparatus that reduces noise for touch panel.
Background technology
Along with the development and the development of technology of society, all kinds of contact panels are applied in the equipment such as personal computer and mobile phone, and present stage is because the wireless network rise; Products such as traditional input media of past such as keyboard, mouse, trace ball; Can't accord with the demands of the market, and contact panel is widely used on each item consumer electronics end product because of possessing simple operations, easy-to-use characteristic; Wherein, the application of capacitance type touch-control panel more and more widely.
Because human body can be considered conductor, when finger during near charged electrode, the electric capacity between finger and the electrode will change, so the central touch sensor (Touch sensor) of capacitance type touch-control panel designs with conductive electrode.When finger or touching pen are run into the specific fixed point on the contact panel, and when the capacitance of this specific fixed point was changed, the capacitance of this change can reflect the position of the specific fixed point of being touched, and uses to offer computer system.
Yet; The simulating signal that touch sensor is exported receives interference of noise through regular meeting; Like power supply noise, display module noise or the interference of radiowave, make can't the judge rightly state of touch sensor of computer system, influence the action and the quality of display device.
Summary of the invention
Therefore, a purpose of the present invention provides a kind of signal noise proportional control system, changes by the noise on the detecting touch sensor, selects the suitable driving voltage in accurate position, to save power consumption.
According to one embodiment of the invention, signal noise proportional control system is used for reducing noise, and this signal noise proportional control system comprises a touch sensor, a touch-control integrated circuit, and surely the position deviator.This touch sensor is driven by a drive signal, and exports at least one simulating signal according to the situation of being touched, and the touch-control integrated circuit produces drive signal, and according to this simulating signal, a branch pressure voltage is provided; Accurate position deviator is according to the accurate position of branch pressure voltage, the voltage quasi position of adjustment drive signal.
Another object of the present invention provides a kind of signal noise proportional control method, changes by the noise on the detecting touch sensor, selects the suitable driving voltage of accurate position size, to save power consumption.
According to another embodiment of the present invention; Signal noise proportional control method is in order to reduce noise; This signal noise proportional control method is a plural groups numeral original signal with an analog signal conversion at first; Analyze digital original signal then, according to the analysis result of digital original signal, whether decision need switch the accurate position of a drive signal; When the accurate position of drive signal needs adjustment, select a new branch pressure voltage; According to a new branch pressure voltage or a former branch pressure voltage, the accurate position of adjustment drive signal is then with drive one touch sensor.
The signal noise proportional control system of above embodiment and signal noise proportional control method; Can be according to present noise condition; The dynamic accurate position that must adjust driving voltage, driving voltage does not need to maintain under the high-tension state always, therefore can reduce power consumption.
Description of drawings
For letting above and other objects of the present invention, characteristic, advantage and the embodiment can be more obviously understandable, appended graphic explanation be following:
Fig. 1 is the calcspar that illustrates an embodiment of the present invention signal noise proportional control system.
Fig. 2 is the circuit diagram that illustrates an embodiment of the present invention voltage selecting circuit.
Fig. 3 is its process flow diagram that illustrates an embodiment of the present invention signal noise proportional control method.
[primary clustering symbol description]
101: touch sensor 103: the touch-control integrated circuit
105: accurate position deviator 107: simulating signal
109: drive signal 111: branch pressure voltage
113: analog-digital converter 115: micro-control unit
117: raw data analysis circuit 119: voltage selecting circuit
121: drive signal generation circuit 123: digital original signal
125: select control signal 201: resistance string
203: resistance 205: switch module
301 ~ 311: steps A: end points
B: end points C: first end
D: the second end V1: supply voltage
VDD: original supply voltage Vref: branch pressure voltage.
Embodiment
General noise can transmit and amplifies along with the simulating signal of sensing together, so is not easy to be suppressed.In order to reduce interference of noise, effective method improves the signal noise ratio exactly, and the voltage quasi position of drive signal is improved, and the analog signal voltage that the touch-control integrated circuit is sensed increases, and cover a certainly less noise signal.
Signal noise proportional control system of following examples and signal noise proportional control method; Can detect present noise condition earlier; According to the noise condition that is detected, see through voltage selecting circuit and select suitable voltage to be input to accurate position deviator then, by accurate position deviator driving voltage is raised to suitable voltage again; Therefore do not need to use high voltage to improve the signal noise ratio always, can reduce power consumption.
Please with reference to Fig. 1, it is the calcspar that illustrates an embodiment of the present invention signal noise proportional control system.Signal noise proportional control system is used for reducing noise, and this signal noise proportional control system mainly contains touch sensor (Touch sensor) 101, touch-control integrated circuit 103 and accurate position deviator 105.
Touch-control integrated circuit 103 is responsible for producing drive signal 109, and this drive signal 109 can be a kind of pulse wave signal (Pulse width signal), is used for driving touch sensor 101; The simulating signal 107 that touch-control integrated circuit 103 can be exported according to touch sensor 101 provides branch pressure voltage 111; And then by the accurate position of accurate position deviator 105 according to branch pressure voltage 111; The voltage quasi position of adjustment drive signal 109 for example can be adjusted to 18V with the voltage quasi position of drive signal 109, impels the voltage quasi position of simulating signal 107 also relatively to improve; Increase the signal noise ratio of simulating signal 107, promote antimierophonic ability.What must specify is; If the situation of noise allows drive signal 109 to keep original voltage quasi position and need not adjustment; Then driving touch sensor 101 with original drive signal 109 gets final product; For instance, if not serious system's error, the 3.3V driven touch sensor 101 that then can be original of can not causing of the situation of noise.
Touch-control integrated circuit 103 contains analog-digital converter 113, micro-control unit 115, and voltage selecting circuit 119.The analog-digital converter 113 responsible simulating signals 107 that touch sensor 101 is exported; Convert array numeral original signal (Raw data) 123 into; On behalf of specific fixed point, the numerical value of original signal 123 charge to the spent time of an expectancy wave, and this time is that the pulse wave number with drive signal 109 adds up estimation, and the numerical value of original signal 123 then can be relevant with the size of noise; In general; The numerical value of original signal 123 is bigger, represents noise condition serious, need the voltage quasi position of drive signal 109 be improved.
If the numerical range of digital original signal 123 is 0 to 1000, then can picks out numerical range and be 800 to 1000 digital original signal 123, and then, produce and select control signal 125 according to the digital original signal of being picked out.For instance, can be that 800 to 1000 digital original signal 123 averages to obtain digital original signal mean value to picking out numerical range, generally speaking, noise condition is more serious, and digital original signal mean value will increase.Then this a digital original signal mean value and a default value are compared, produce according to comparative result and select control signal 125.119 of voltage selecting circuits produce branch pressure voltage according to selecting control signal 125, and when noise condition heals when serious, the branch pressure voltage that is produced will have the accurate position of higher voltage.
Touch-control integrated circuit 103 also contains drive signal generation circuit 121 in addition, receives the control of micro-control unit 115, the intensity and the frequency of adjustment drive signal 109.
Please with reference to Fig. 2, it is the circuit diagram that illustrates an embodiment of the present invention voltage selecting circuit.Voltage selecting circuit includes resistance string 201 and several switch modules 205.Resistance string 201 includes several resistance 203 of serial connection, and a terminal A of resistance string 201 is connected to voltage input end, receives and dividing potential drop supply voltage V1, and another terminal B of this resistance string 201 is ground connection then.
The first end C of each switch module 205 is connected to a corresponding resistance 203; The second end D of each switch module 205 is connected to the branch pressure voltage output terminal; These switch modules 205 receive the control of selecting control signal and conducting or end; One resistance end points D of resistance 203 is connected to the branch pressure voltage output terminal, with output branch pressure voltage Vref.
Please with reference to Fig. 3, it is the process flow diagram that illustrates an embodiment of the present invention signal noise proportional control method.Signal noise proportional control method is used for reducing noise, and this signal noise proportional control method is an array numeral original signal (step 301) with analog signal conversion at first, analyzes digital original signal (step 303) then.The numerical value of the digital original signal that noise caused under the different situations also can be different; Can make the standard position of drive signal equal original supply voltage VDD (3.3V) earlier; Corresponding digital original signal on each position of measure analysis then is tentatively to learn the situation of noise.
Then; According to the analysis result of digital original signal, whether decision need switch the accurate position (step 305) of drive signal, wherein is that an original signal mean value and a standard value are compared; When original signal mean value overgauge value; Represent noise serious, the standard position of drive signal need be switched, and then continues to select new branch pressure voltage (step 307).In detail,, then can select the higher branch pressure voltage in accurate position,, then can select the lower branch pressure voltage in accurate position if the situation of noise alleviates if the situation of noise is serious.
And then according to new branch pressure voltage or former branch pressure voltage; The accurate position (step 309) of adjustment drive signal; What must specify is if in the middle of step 305, judge the position standard that needs to switch drive signal, then to adjust the accurate position of drive signal according to new branch pressure voltage; If in the middle of step 305, judge the accurate position that need not to switch drive signal, then adjust the accurate position of drive signal according to former branch pressure voltage.Further; If the selected new branch pressure voltage that comes out is 18V; Just can be adjusted to 18V to the standard of drive signal position; Just the standard of drive signal position is adjusted to the standard position of branch pressure voltage and equates, again with this adjusted drive touch sensor (step 311), the high signal noise ratio of the simulating signal that the raising touch sensor is exported.
The signal noise proportional control system of above embodiment and signal noise proportional control method; Can detect present noise condition earlier; According to the noise condition that is detected, see through voltage selecting circuit and select suitable voltage to be input to accurate position deviator then, by accurate position deviator driving voltage is raised to suitable voltage again; Therefore do not need to use high voltage to improve the signal noise ratio always, can reduce power consumption.
Though the present invention discloses as above with embodiment; Right its is not in order to limit the present invention; Any have a common knowledge the knowledgeable person in the middle of technical field under the present invention; Do not breaking away from the spirit and scope of the present invention, when can doing various changes and retouching, so protection scope of the present invention is as the criterion when looking accompanying the claim person of defining.
Claims (10)
1. signal noise proportional control system is characterized in that: in order to reduce noise, this signal noise proportional control system comprises:
One touch sensor is driven by a drive signal, and exports at least one simulating signal according to the situation of being touched;
One touch-control integrated circuit producing this drive signal, and according to this simulating signal, provides a branch pressure voltage; And
Surely the position deviator with the accurate position according to this branch pressure voltage, is adjusted the voltage quasi position of this drive signal.
2. signal noise proportional control system according to claim 1 is characterized in that: wherein this touch-control integrated circuit comprises:
One analog-digital converter with this simulating signal that this touch sensor is exported, converts plural groups numeral original signal into;
One micro-control unit is analyzed those digital original signals, and according to those digital original signals, produces one and select control signal; And
One voltage selecting circuit to select control signal according to this, produces this branch pressure voltage.
3. signal noise proportional control system according to claim 2; It is characterized in that: wherein this micro-control unit comprises a raw data analysis circuit; Numerical value with to those digital original signals is analyzed, and picks out those the digital original signals with special value scope.
4. signal noise proportional control system according to claim 3 is characterized in that: wherein this micro-control unit is according to those digital original signals of being picked out, produces and should select control signal.
5. signal noise proportional control system according to claim 2, it is characterized in that: wherein this voltage selecting circuit comprises:
One resistance string comprises a plurality of resistance of serial connection, and an end points of this resistance string is connected to a voltage input end, and to receive and dividing potential drop one supply voltage, another end points of this resistance string is ground connection then; And
A plurality of switch modules, one first end of each switch module is connected to corresponding one this resistance, and one second end of each switch module is connected to a branch pressure voltage output terminal,
Wherein, those switch modules are to receive control and the conducting of this selection control signal or end, and a resistance end points of those resistance are connected to this branch pressure voltage output terminal, to export this branch pressure voltage.
6. signal noise proportional control system according to claim 2 is characterized in that: wherein this touch-control integrated circuit more comprises:
One drive signal generation circuit receives the control of this micro-control unit, with intensity and the frequency of adjusting this drive signal.
7. signal noise proportional control method is characterized in that: in order to reduce noise, this signal noise proportional control method comprises:
With an analog signal conversion is plural groups numeral original signal;
Analyze those digital original signals;
According to the analysis result of those digital original signals, whether decision need switch the accurate position of a drive signal;
When the accurate position of this drive signal needs adjustment, select a new branch pressure voltage;
According to this a new branch pressure voltage or a former branch pressure voltage, adjust the accurate position of this drive signal; And
With this drive one touch sensor.
8. signal noise proportional control method according to claim 7 is characterized in that: the step of wherein those digital original signals being analyzed comprises:
Pick out those digital original signals with special value scope; And
Those digital original signals to being selected average, to obtain an original signal mean value.
9. signal noise proportional control method according to claim 8; It is characterized in that: wherein be that this an original signal mean value and a standard value are compared; When this original signal mean value during, represent the standard position of this drive signal to switch greater than this standard value.
10. signal noise proportional control method according to claim 8 is characterized in that: wherein be the standard of this drive signal position to be adjusted to the standard of this former branch pressure voltage or this new branch pressure voltage equate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210095123.9A CN102662518B (en) | 2012-03-31 | 2012-03-31 | System and method for controlling signal noise ratio |
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| CN201210095123.9A CN102662518B (en) | 2012-03-31 | 2012-03-31 | System and method for controlling signal noise ratio |
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| CN102662518A true CN102662518A (en) | 2012-09-12 |
| CN102662518B CN102662518B (en) | 2015-02-11 |
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| CN103677432A (en) * | 2014-01-07 | 2014-03-26 | 华映视讯（吴江）有限公司 | Touch panel driving method and touch system |
| CN103809823A (en) * | 2012-11-13 | 2014-05-21 | 乐金显示有限公司 | Display device including integrated touch panel and method of driving the same |
| CN104113041A (en) * | 2014-05-30 | 2014-10-22 | 西安电子科技大学 | Under-voltage protection circuit for Ethernet power supply |
| CN104133574A (en) * | 2013-05-03 | 2014-11-05 | 义隆电子股份有限公司 | Touch device and dynamic adjustment method for measured voltage thereof |
| CN104765483A (en) * | 2014-01-06 | 2015-07-08 | 联阳半导体股份有限公司 | Touch device and touch method thereof |
| CN104881190A (en) * | 2015-05-11 | 2015-09-02 | 联想(北京)有限公司 | Method and electronic apparatus for handling interference |
| CN105320383A (en) * | 2014-07-18 | 2016-02-10 | 苹果公司 | Adjustment of touch sensing stimulation voltage levels based on touch performance |
| EP3151086A1 (en) * | 2015-09-30 | 2017-04-05 | LG Display Co., Ltd. | Touch driving signal generating device, touch driving device including the same, and display device and driving method thereof |
| CN106959774A (en) * | 2016-01-08 | 2017-07-18 | 禾瑞亚科技股份有限公司 | Controller applied to Touch Screen |
| CN110162227A (en) * | 2018-02-14 | 2019-08-23 | 李尚礼 | The adquisitiones of capacitive sensing device and its security criteria point |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US9317152B2 (en) | 2012-11-13 | 2016-04-19 | Lg Display Co., Ltd. | Display device including integrated touch panel and method of driving the same |
| CN103809823A (en) * | 2012-11-13 | 2014-05-21 | 乐金显示有限公司 | Display device including integrated touch panel and method of driving the same |
| CN103809823B (en) * | 2012-11-13 | 2017-10-10 | 乐金显示有限公司 | Display device and its driving method including integrated touch panels |
| CN104133574A (en) * | 2013-05-03 | 2014-11-05 | 义隆电子股份有限公司 | Touch device and dynamic adjustment method for measured voltage thereof |
| CN104765483B (en) * | 2014-01-06 | 2018-06-05 | 联阳半导体股份有限公司 | Touch device and touch method thereof |
| CN104765483A (en) * | 2014-01-06 | 2015-07-08 | 联阳半导体股份有限公司 | Touch device and touch method thereof |
| CN103677432A (en) * | 2014-01-07 | 2014-03-26 | 华映视讯（吴江）有限公司 | Touch panel driving method and touch system |
| CN104113041B (en) * | 2014-05-30 | 2017-03-29 | 西安电子科技大学 | A kind of under-voltage protecting circuit for POE |
| CN104113041A (en) * | 2014-05-30 | 2014-10-22 | 西安电子科技大学 | Under-voltage protection circuit for Ethernet power supply |
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| US10372271B2 (en) | 2014-07-18 | 2019-08-06 | Apple Inc. | Adjustment of touch sensing stimulation voltage levels based on touch performance |
| CN104881190A (en) * | 2015-05-11 | 2015-09-02 | 联想(北京)有限公司 | Method and electronic apparatus for handling interference |
| CN104881190B (en) * | 2015-05-11 | 2017-12-29 | 联想(北京)有限公司 | One kind interference processing method and electronic equipment |
| EP3151086A1 (en) * | 2015-09-30 | 2017-04-05 | LG Display Co., Ltd. | Touch driving signal generating device, touch driving device including the same, and display device and driving method thereof |
| US10198064B2 (en) | 2015-09-30 | 2019-02-05 | Lg Display Co., Ltd. | Touch driving signal generating device, touch driving device including the same, and display device and driving method thereof |
| CN106959774A (en) * | 2016-01-08 | 2017-07-18 | 禾瑞亚科技股份有限公司 | Controller applied to Touch Screen |
| CN106959774B (en) * | 2016-01-08 | 2020-01-31 | 禾瑞亚科技股份有限公司 | Controller applied to touch screen |
| CN110162227A (en) * | 2018-02-14 | 2019-08-23 | 李尚礼 | The adquisitiones of capacitive sensing device and its security criteria point |
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