CN102662518B - System and method for controlling signal noise ratio - Google Patents
System and method for controlling signal noise ratio Download PDFInfo
- Publication number
- CN102662518B CN102662518B CN201210095123.9A CN201210095123A CN102662518B CN 102662518 B CN102662518 B CN 102662518B CN 201210095123 A CN201210095123 A CN 201210095123A CN 102662518 B CN102662518 B CN 102662518B
- Authority
- CN
- China
- Prior art keywords
- signal
- noise ratio
- voltage
- drive singal
- branch pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Position Input By Displaying (AREA)
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 relate to a kind of method and apparatus reducing noise for touch panel especially.
Background technology
Along with the development of society and the progress of technology, all kinds of contact panel is applied in the equipment such as personal computer and mobile phone, present stage rises due to wireless network, past conventional input devices is as products such as keyboard, mouse, trace balls, cannot accord with the demands of the market, and contact panel is because possessing simple operations, easy-to-use characteristic, is widely used on every consumer electronics end product, wherein, the application of capacitance type touch-control panel is more and more extensive.
Because human body can be considered conductor, when pointing when charged electrode, the electric capacity between finger and electrode will change, therefore the touch sensor (Touch sensor) in the middle of capacitance type touch-control panel is generally design with conductive electrode.Encounter the specific fixed point on contact panel when finger or touching pen, and when the capacitance of this specific fixed point is changed, this capacitance changed can reflect the position of touched specific fixed point, uses to be supplied to computer system.
But; the simulating signal that touch sensor exports often can be subject to the interference of noise; as power supply noise, display module noise or the interference of radiowave, computer system cannot be correctly judged the state of touch sensor, affect action and the quality of display device.
Summary of the invention
Therefore, an object of the present invention is to provide a kind of signal noise ratio control system, by the noise change on detecting touch sensor, selects the driving voltage that level is suitable, to save power consumption.
According to one embodiment of the invention, signal noise ratio control system is used for reducing noise, and this signal noise ratio control system comprises a touch sensor, a touch-control integrated circuit, and a level-shift device.This touch sensor driven by a drive singal, and exports at least one simulating signal according to touched situation, and touch-control integrated circuit produces drive singal, and according to this simulating signal, provides a branch pressure voltage; Level-shift device, according to the level of branch pressure voltage, adjusts the voltage quasi position of drive singal.
Another object of the present invention is to provide a kind of signal noise ratio control method, by the noise change on detecting touch sensor, selects the driving voltage that level size is suitable, to save power consumption.
According to another embodiment of the present invention, signal noise ratio control method is in order to reduce noise, first one simulating signal is converted to plural groups numeral original signal by this signal noise ratio control method, then digital original signal is analyzed, according to the analysis result of digital original signal, determine the level the need of switching one drive singal; When the level of drive singal needs adjustment, select a new branch pressure voltage; According to new branch pressure voltage or a former branch pressure voltage, the level of adjustment drive singal, then drives a touch sensor with drive singal.
The signal noise ratio control system of above embodiment and signal noise ratio control method, can according to current noise condition, the dynamic level that must adjust driving voltage, therefore driving voltage can reduce power consumption under not needing to maintain high-tension state always.
Accompanying drawing explanation
For above and other objects of the present invention, feature, advantage and embodiment can be become apparent, being described as follows of institute's accompanying drawings:
Fig. 1 is the calcspar illustrating an embodiment of the present invention signal noise ratio control system.
Fig. 2 is the circuit diagram illustrating an embodiment of the present invention voltage selecting circuit.
Fig. 3 is that it illustrates the process flow diagram of an embodiment of the present invention signal noise ratio control method.
[primary clustering symbol description]
101: touch sensor 103: touch-control integrated circuit
105: level-shift device 107: simulating signal
109: drive singal 111: branch pressure voltage
113: analog-digital converter 115: micro-control unit
117: primary 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 together along with the simulating signal sensed and amplify, and is therefore not easy suppressed.In order to reduce the interference of noise, most effective method improves signal noise ratio exactly, is improved by the voltage quasi position of drive singal, and the analog signal voltage that touch-control integrated circuit is sensed increases, and covers the noise signal that level is less.
The signal noise ratio control system of following examples and signal noise ratio control method, can first detect current noise condition, then according to the noise condition detected, suitable voltage is selected to be input to level-shift device through voltage selecting circuit, by level-shift device, driving voltage is raised to suitable voltage again, therefore do not need to use high voltage to improve signal noise ratio always, can power consumption be reduced.
Please refer to Fig. 1, it is the calcspar illustrating an embodiment of the present invention signal noise ratio control system.Signal noise ratio control system is used for reducing noise, and this signal noise ratio control system is mainly containing touch sensor (Touch sensor) 101, touch-control integrated circuit 103 and level-shift device 105.
Touch sensor 101 driven by drive singal 109, and according to touched situation outputting analog signal 107.Touch sensor 101 is generally design with conductive electrode, when pointing or touching pen encounters specific fixed point and makes the capacitance of this specific fixed point change, the capacitance of this change can reflect the position of touched specific fixed point, use to be supplied to computer system, such as can be supplied to Windows, (SuSE) Linux OS, or Android operation system uses.The electrode design of touch sensor 101 can be divided into the electrode design of diamond pattern (Diamond Pattern) kenel or strip pattern (Strip pattern) kenel or other capacitor induction type, the method of sense capacitance change then can be divided into discharge and recharge transformation approach or RC succusion according to its pattern, or other can the method for sense capacitance.
Touch-control integrated circuit 103 is responsible for producing drive singal 109, and this drive singal 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 export according to touch sensor 101 provides branch pressure voltage 111, and then by the level of level-shift device 105 according to branch pressure voltage 111, the voltage quasi position of adjustment drive singal 109, such as the voltage quasi position of drive singal 109 can be adjusted to 18V, the voltage quasi position of simulating signal 107 is impelled also relatively to improve, increase the signal noise ratio of simulating signal 107, the ability of raising anti-noise.What must illustrate is, if the situation of noise allows drive singal 109 to maintain original voltage quasi position without the need to adjustment, then drive touch sensor 101 with original drive singal 109, for example, if the not serious system that can not cause of the situation of noise is slipped up, then 3.3V voltage driven touch sensor 101 that can be original.
Touch-control integrated circuit 103 is containing analog-digital converter 113, micro-control unit 115, and voltage selecting circuit 119.The simulating signal 107 exported by touch sensor 101 is responsible for by analog-digital converter 113, be converted to array numeral original signal (Raw data) 123, the numerical value of original signal 123 represents specific fixed point and charges to time spent by an expectancy wave, this time carries out accumulative estimation with the pulse wave number of drive singal 109, the numerical value of original signal 123 then can be relevant to the size of noise, in general, the numerical value of original signal 123 is larger, represent noise condition serious, need the voltage quasi position of drive singal 109 to improve.
Micro-control unit 115 can analyze digital original signal 123, and produces selection control signal 125 according to digital original signal 123.Micro-control unit 115 includes a primary data analysis circuit 117, is responsible for analyzing the numerical value of digital original signal 123, picks out the digital original signal 123 with special value scope.For example, primary data analysis circuit 117 can pick out numerical range before total value scope 20% digital original signal 123 be averaged.
If the numerical range of digital original signal 123 is 0 to 1000, then can pick out the digital original signal 123 that numerical range is 800 to 1000, and then according to the digital original signal picked out, produce and select control signal 125.For example, can to pick out numerical range be 800 to 1000 digital original signal 123 be averaged to obtain digital original signal mean value, generally speaking, noise condition is more serious, and digital original signal mean value will increase.Then this digital original signal mean value and a default value are compared, produce according to comparative result and select control signal 125.Voltage selecting circuit 119, according to selecting control signal 125, produces branch pressure voltage, and when noise condition is more serious, the branch pressure voltage produced will have higher voltage quasi position.
Touch-control integrated circuit 103 also containing drive signal generation circuit 121, is subject to the control of micro-control unit 115 in addition, the intensity of adjustment drive singal 109 and frequency.
Please refer to Fig. 2, it is the circuit diagram illustrating an embodiment of the present invention voltage selecting circuit.Voltage selecting circuit includes resistance string 201 and several switch module 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, another terminal B then ground connection of this resistance string 201.
The first end C of each switch module 205 is connected to a corresponding resistance 203, second end D of each switch module 205 is connected to branch pressure voltage output terminal, these switch modules 205 are subject to selecting the control of control signal and conducting or cut-off, one resistance end points D of resistance 203 is connected to branch pressure voltage output terminal, to export branch pressure voltage Vref.
Please refer to Fig. 3, it is the process flow diagram illustrating an embodiment of the present invention signal noise ratio control method.Signal noise ratio control method is used for reducing noise, and first simulating signal is converted to array numeral original signal (step 301) by this signal noise ratio control method, then analyzes digital original signal (step 303).The numerical value of the digital original signal that the noise under different situations causes also can be different, the level of drive singal can be first made to equal original supply voltage VDD (3.3V), then corresponding digital original signal on each position of measure analysis, tentatively to learn the situation of noise.
The digital original signal with special value scope first can be picked out to the step 303 that digital original signal is analyzed, such as pick out numerical range front 20% digital original signal, again the digital original signal be selected is averaged, to obtain an original signal mean value.
Then, according to the analysis result of digital original signal, determine the level (step 305) the need of switching drive singal, wherein that original signal mean value and a standard value are compared, when original signal mean value is greater than standard value, represent noise serious, the level of drive singal needs to switch, then continue to select new branch pressure voltage (step 307).Specifically, if the situation of noise is serious, then can selects the branch pressure voltage that level is higher, if the situation of noise alleviates, then can select the branch pressure voltage that level is lower.
And then according to new branch pressure voltage or former branch pressure voltage, the level (step 309) of adjustment drive singal, must illustrate, if judge that in the middle of step 305 position needing to switch drive singal is accurate, then adjust the level of drive singal according to new branch pressure voltage; If judge the level without the need to switching drive singal in the middle of step 305, then adjust the level of drive singal according to former branch pressure voltage.Furthermore, if selected new branch pressure voltage is out 18V, just the level of drive singal can be adjusted to 18V, namely the level of drive singal is adjusted to equal with the level of branch pressure voltage, drive touch sensor (step 311) with this adjusted drive singal again, improve the high signal noise ratio of the simulating signal that touch sensor exports.
The signal noise ratio control system of above embodiment and signal noise ratio control method, can first detect current noise condition, then according to the noise condition detected, suitable voltage is selected to be input to level-shift device through voltage selecting circuit, by level-shift device, driving voltage is raised to suitable voltage again, therefore do not need to use high voltage to improve signal noise ratio always, can power consumption be reduced.
Although the present invention discloses as above with embodiment; so itself and be not used to limit the present invention; any have in the middle of the technical field of the invention usually know the knowledgeable person; without departing from the spirit and scope of the present invention; when being used for a variety of modifications and variations, therefore protection scope of the present invention is when being as the criterion depending on the accompanying claim person of defining.
Claims (8)
1. a signal noise ratio control system, is characterized in that: in order to reduce noise, and this signal noise ratio control system comprises:
One touch sensor, driven by a drive singal, and exports at least one simulating signal according to touched situation;
One touch-control integrated circuit, to produce this drive singal, and according to this simulating signal, provides a branch pressure voltage; And
One level-shift device, with the level according to this branch pressure voltage, adjusts the voltage quasi position of this drive singal;
Wherein this touch-control integrated circuit comprises:
One analog-digital converter, with this simulating signal exported by this touch sensor, is converted to plural groups numeral original signal;
One micro-control unit, analyzes those digital original signals, and according to those digital original signals, produces one and select control signal; And
One voltage selecting circuit, with according to this selection control signal, produces this branch pressure voltage;
Wherein this micro-control unit comprises a primary data analysis circuit, to analyze the numerical value of those digital original signals, picks out those digital original signals with special value scope.
2. signal noise ratio control system according to claim 1, is characterized in that: wherein this micro-control unit is those the digital original signals according to picking out, and produces this selection control signal.
3. signal noise ratio control system according to claim 1, 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, to receive and dividing potential drop one supply voltage, and another end points then ground connection of this resistance string; And
A plurality of switch module, a 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 subject to the control of this selection control signal and conducting or cut-off, a resistance end points of those resistance is connected to this branch pressure voltage output terminal, to export this branch pressure voltage.
4. signal noise ratio control system according to claim 1, is characterized in that: wherein this touch-control integrated circuit more comprises:
One drive signal generation circuit, is subject to the control of this micro-control unit, to adjust intensity and the frequency of this drive singal.
5. a signal noise ratio control method, is characterized in that: in order to reduce noise, and this signal noise ratio control method comprises:
One simulating signal is converted to plural groups numeral original signal;
Analyze those digital original signals;
According to the analysis result of those digital original signals, determine the level the need of switching one drive singal;
When the level of this drive singal needs adjustment, select a new branch pressure voltage;
According to this new branch pressure voltage or a former branch pressure voltage, adjust the level of this drive singal; And
A touch sensor is driven with this drive singal.
6. signal noise ratio control method according to claim 5, is characterized in that: wherein comprise the step that those digital original signals are analyzed:
Pick out those digital original signals with special value scope; And
Those the digital original signals be selected are averaged, to obtain an original signal mean value.
7. signal noise ratio control method according to claim 6, it is characterized in that: be wherein that this original signal mean value and a standard value are compared, when this original signal mean value is greater than this standard value, the level representing this drive singal needs to switch.
8. signal noise ratio control method according to claim 6, is characterized in that: be wherein that the level of this drive singal to be adjusted to the level of branch pressure voltage former in this or this new branch pressure voltage equal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210095123.9A CN102662518B (en) | 2012-03-31 | 2012-03-31 | System and method for controlling signal noise ratio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210095123.9A CN102662518B (en) | 2012-03-31 | 2012-03-31 | System and method for controlling signal noise ratio |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102662518A CN102662518A (en) | 2012-09-12 |
| CN102662518B true CN102662518B (en) | 2015-02-11 |
Family
ID=46772022
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210095123.9A Expired - Fee Related CN102662518B (en) | 2012-03-31 | 2012-03-31 | System and method for controlling signal noise ratio |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102662518B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101455315B1 (en) | 2012-11-13 | 2014-10-27 | 엘지디스플레이 주식회사 | Display device with integrated touch screen and method for driving the same |
| TWI497371B (en) * | 2013-05-03 | 2015-08-21 | Elan Microelectronics Corp | Touch device and measuring voltage dynamic adjustment method thereof |
| TWI522862B (en) * | 2014-01-06 | 2016-02-21 | 聯陽半導體股份有限公司 | Touch apparatus 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 |
| US10372271B2 (en) * | 2014-07-18 | 2019-08-06 | Apple Inc. | Adjustment of touch sensing stimulation voltage levels based on touch performance |
| CN104881190B (en) * | 2015-05-11 | 2017-12-29 | 联想(北京)有限公司 | One kind interference processing method and electronic equipment |
| KR102592849B1 (en) | 2015-09-30 | 2023-10-20 | 엘지디스플레이 주식회사 | Apparatus for generating touch driving signal and apparatus for driving touch comprising the same, display apparatus and method for driving thereof |
| TWI584170B (en) * | 2016-01-08 | 2017-05-21 | Egalax_Empia Tech Inc | Applies to the touch screen controller |
| TWI765967B (en) * | 2018-02-14 | 2022-06-01 | 李尚禮 | Capacitive sensor device and method for obtaining a reference level thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101983372A (en) * | 2008-04-04 | 2011-03-02 | 高通股份有限公司 | Low-power touch screen controller |
| CN102289332A (en) * | 2010-06-21 | 2011-12-21 | 安华高科技Ecbuip(新加坡)私人有限公司 | Reduction of electromagnetic interference in capacitive touchscreen system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100449745B1 (en) * | 2002-11-21 | 2004-09-22 | 삼성전자주식회사 | Apparatus and Method for avoiding noise of touch screen |
-
2012
- 2012-03-31 CN CN201210095123.9A patent/CN102662518B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101983372A (en) * | 2008-04-04 | 2011-03-02 | 高通股份有限公司 | Low-power touch screen controller |
| CN102289332A (en) * | 2010-06-21 | 2011-12-21 | 安华高科技Ecbuip(新加坡)私人有限公司 | Reduction of electromagnetic interference in capacitive touchscreen system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102662518A (en) | 2012-09-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102662518B (en) | System and method for controlling signal noise ratio | |
| US8593212B2 (en) | Signal noise ratio control system and method thereof | |
| US9898109B2 (en) | Active stylus pen and signal transmission methods for stylus pen and touch panel | |
| US8493131B2 (en) | Capacitive touch panel detection circuit and boost circuit thereof | |
| CN103809824B (en) | Touch sensing system and method of controlling power consumption thereof | |
| US20120256870A1 (en) | Stimulus signal for a capacitive sense array | |
| CN104679367A (en) | Transmitter and controlling method thereof | |
| CN102087565A (en) | Touch control pen applied to touchpad module and method for automatically emiting signals | |
| CN104423647A (en) | Touch input device and system thereof | |
| CN108021269A (en) | Touch sensor controller | |
| CN104951157A (en) | Capacitive touch device and method for detecting active pen and object | |
| CN100573431C (en) | cursor control device and method | |
| CN103645813A (en) | Stylus and method for initiatively transmitting signal of stylus | |
| CN103365507A (en) | Sensing device and method for improving reliability of capacitive touch device | |
| CN106909244B (en) | Touch key, touch operation detection method, touch IC and electronic equipment | |
| CN103677467A (en) | Touch sensitive device | |
| CN111164556A (en) | Touch chip, electronic equipment and touch method | |
| CN104881152A (en) | Transmitter and Transmitting Method Thereof | |
| CN104657008A (en) | Touch sensing device and operation method thereof | |
| CN206696833U (en) | Electronic handwriting device and electronic handwritten display system | |
| CN105306038A (en) | Capacitive sensing touch control key and key judging method thereof | |
| CN203287847U (en) | Gesture recognition all-in-one machine based on MGC3130 chip | |
| US11487391B2 (en) | Touch sensing device and method for multi-driving | |
| CN103677432A (en) | Touch panel driving method and touch system | |
| CN103365503B (en) | Phase mutual capacitance type contactor control device and its method of operating |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150211 Termination date: 20200331 |