CN103309529B - A kind of capacitance touch screen and the method identifying touch signal thereof - Google Patents
A kind of capacitance touch screen and the method identifying touch signal thereof Download PDFInfo
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Abstract
Embodiments provide a kind of capacitance touch screen and the method identifying touch signal thereof, first select to meet pre-conditioned optimum frequency section from the current environment at capacitance touch screen place, and this optimum frequency section is set to the operating frequency section of described capacitance touch screen, thus capacitance touch screen can only receive the signal in described optimum frequency section or noise, noise in the range of other does not receives, namely judge whether to receive touch signal according to the change of the current environment Whole frequency band frequency spectrum at capacitance touch screen place, it is substantially to carry out judging according to the change of signal and noise spectrum in this optimum frequency section, thus reached to improve the purpose identifying touch signal.The capacitance touch screen using the embodiment of the present invention to provide can also reach to improve the purpose identifying touch signal.
Description
Technical field
The present invention relates to touch screen field, in particular, relate to a kind of capacitance touch screen and identification thereof
The method of touch signal.
Background technology
Along with developing rapidly of touch screen, capacitance touch screen has become as requisite lifestyle device and work
Make equipment.
Capacitance touch screen surfaces has particulate metal layer of layer of transparent, when finger touches on the metal layer,
The electric capacity of touch point will change, thus creates touch signal, and capacitance touch screen is according to self institute
Current environment in full frequency band frequency spectrum change judge whether to receive touch signal.
During realizing the invention, inventor finds that prior art at least has a disadvantage in that
In actual applications, capacitance touch screen is often used in conjunction with LCD module, and capacitance touch screen is by handing over
Flowing signal-powered, the fluorescent tube in LCD module is also powered by AC signal, and the crystal in LCD divides
The deflection voltage needed when son rotates also is produced by AC signal, and the electric field of these three AC signal is folded
It is added together and will produce interference signal；The environment at capacitance touch screen place also likely to be present environment noise,
Due to obtain touch signal time, be Whole frequency band frequency spectrum in the current environment according to capacitance touch screen place
Change, namely according to interference signal, environment noise and the change of touch signal frequency spectrum, owing to touching
Signal is the faintest signal, in that way it is possible to touch signal can be caused by environment noise and interference signal
Flood, it is impossible to the correct consequence identifying touch signal.
Summary of the invention
In view of this, the invention provides a kind of capacitance touch screen and the method identifying touch signal thereof, with
Overcome in prior art due to touch signal by environment noise and interference signal flood, capacitance touch screen without
The problem that method correctly identifies touch signal.
For achieving the above object, the present invention provides following technical scheme:
A kind of method of capacitance touch screen identification touch signal, described method includes:
Determine and the current environment at capacitance touch screen place meets pre-conditioned optimum frequency section；
Described optimum frequency section is set to the operating frequency section of described capacitance touch screen；
Detect whether to receive described touch signal in described operating frequency section.
Wherein, the described current environment determining capacitance touch screen place meets pre-conditioned optimum frequency
Section includes:
Whole frequency band frequency spectrum in the current environment at capacitance touch screen place is sampled, it is thus achieved that multiple sampling frequencies
Rate；
Obtain according to each sampling frequency and meet described pre-conditioned optimum frequency section.
Wherein, described acquisition according to each sampling frequency meets described pre-conditioned optimum frequency section and includes:
By sampling frequency one frequency band of composition adjacent at least two, it is thus achieved that at least two frequency band；
Calculate the meansigma methods of noise energy at the sampling frequency in each frequency band；
Obtain to meet by the meansigma methods comparing the noise energy at the sampling frequency in each frequency band and preset
The optimum frequency section of condition.
Preferably, the described pre-conditioned meansigma methods for the noise energy at sampling frequency is minimum.
Preferably, after detecting whether to receive described touch signal step in described operating frequency section,
Described method also includes:
When arriving at preset time intervals, calculate signal to noise ratio；Described signal to noise ratio is the touch signal received
The ratio of all signal energies that receives in described optimum frequency section with described capacitance touch screen of energy；
The signal to noise ratio that relatively whether current signal calculates when arriving less than previous predetermined time interval,
If it is, again determine and the current environment at capacitance touch screen place meet pre-conditioned operating frequency
Section, if it is not, then described capacitance touch screen continues to detect whether to receive described touch signal.
A kind of capacitance touch screen, described capacitance touch screen includes:
Determine module, for determine the current environment at capacitance touch screen place meets pre-conditioned optimal
Frequency band；
Module is set, for described optimum frequency section is set to the operating frequency section of described capacitance touch screen；
Detection module, for detecting whether to receive touch signal in described operating frequency section.
Wherein, described determine that module includes:
Sampling unit, for Whole frequency band frequency spectrum in the current environment at capacitance touch screen place is sampled,
Obtain multiple sampling frequency；
Acquiring unit, meets described pre-conditioned optimum frequency section for obtaining according to each sampling frequency.
Wherein, described acquiring unit includes:
Composition subelement, for by sampling frequency one frequency band of composition adjacent at least two, it is thus achieved that extremely
Few two frequency bands；
Computation subunit, for calculating the meansigma methods of the noise energy at the sampling frequency in each frequency band；
Obtain subelement, for by comparing in each frequency band the average of noise energy at sampling frequency
Value obtains and meets pre-conditioned optimum frequency section.
Preferably, the described pre-conditioned meansigma methods for the noise energy at sampling frequency is minimum.
Preferably, described capacitance touch screen also includes:
Computing module, in time arriving at preset time intervals, calculates signal to noise ratio；Described signal to noise ratio is for connecing
It is all that the energy of the touch signal received and described capacitance touch screen receive in described optimum frequency section
The ratio of signal energy；
Comparison module, by comparing based on when whether current signal arrives less than previous predetermined time interval
The signal to noise ratio calculated；
Trigger module, in the case of at the comparative result of described comparison module for being, trigger described really
Cover half block, in the case of the comparative result of described comparison module is for being, triggers described detection module.
A kind of electronic equipment, including the capacitance touch screen described in any of the above-described item.
Understand via above-mentioned technical scheme, compared with prior art, the embodiment of the invention discloses one
The method of capacitance touch screen identification touch signal, first selects from the current environment at capacitance touch screen place
Meet pre-conditioned optimum frequency section, and this optimum frequency section is set to the work of described capacitance touch screen
Working frequency section, thus, capacitance touch screen can only receive the signal in described optimum frequency section or noise,
Noise in the range of other does not receives, and namely the current environment according to capacitance touch screen place is complete
The change of band spectrum judges whether to receive touch signal, is substantially to believe according in this optimum frequency section
Number and the change of noise spectrum carry out judging, thus reached to improve the purpose identifying touch signal；Enter
One step, if described optimum frequency section does not interferes with signal and ambient noise signal, so, electric capacity
The signal that touch screen detects in optimum frequency section almost only has touch signal, thus reaches more accurate
Identify touch signal purpose.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to reality
Execute the required accompanying drawing used in example or description of the prior art to be briefly described, it should be apparent that below,
Accompanying drawing in description is only embodiments of the invention, for those of ordinary skill in the art, not
On the premise of paying creative work, it is also possible to obtain other accompanying drawing according to the accompanying drawing provided.
Fig. 1 is the method for the embodiment of the present invention the first capacitance touch screen identification touch signal disclosed
Flow chart；
Fig. 2 is the stream of the method for the second capacitance touch screen identification touch signal disclosed in the embodiment of the present invention
Cheng Tu；
Fig. 3 is the structural representation of the embodiment of the present invention the first capacitance touch screen disclosed；
Fig. 4 is the result schematic diagram of the second capacitance touch screen disclosed in the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the present invention, and
It is not all, of embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art are not doing
Go out the every other embodiment obtained under creative work premise, broadly fall into the scope of protection of the invention.
Embodiment one
Refer to accompanying drawing 1, the embodiment of the present invention the first capacitance touch screen identification touch signal disclosed
Method includes:
Step S101: determine and meet pre-conditioned optimum frequency in the current environment at capacitance touch screen place
Section；
In actual applications, capacitance touch screen is often used in conjunction with LCD module, and capacitance touch screen is by handing over
Flowing signal-powered, the fluorescent tube in LCD module is also powered by AC signal, and the crystal in LCD divides
The deflection voltage needed when son rotates also is produced by AC signal, and the electric field of these three AC signal is folded
Being added together and will produce interference signal, the current environment at capacitance touch screen place also likely to be present environment and makes an uproar
Sound, in the current environment of described capacitance touch screen place, Whole frequency band frequency spectrum potentially includes: ambient noise spectrum,
Interference signal spectrum and touch signal frequency spectrum.
Preferably, capacitance touch screen performs step S101 in the case of not touched by people, due to now electric
Hold the Whole frequency band frequency spectrum in the current environment at touch screen place and potentially include ambient noise spectrum and interference letter
Number frequency spectrum, does not include the frequency spectrum of touch signal, and the optimum frequency section so determined is the most accurately, certainly
Step S101 can also be performed in the case of being touched by people according to different practical situation capacitance touch screens.
Concrete, determine and the current environment at capacitance touch screen place meets pre-conditioned optimum frequency section
Step include:
Whole frequency band frequency spectrum in the current environment at capacitance touch screen place is sampled, it is thus achieved that multiple sampling frequencies
Rate；
Obtain according to each sampling frequency and meet pre-conditioned optimum frequency section.
Preferably, before capacitance touch screen receives touch signal, namely user touches capacitance touch
Before screen, first detect the full frame i.e. noise spectrum of band frequency spectrum and the interference signal of capacitance touch screen place environment
Frequency spectrum, so, can by sampling method detect current environment Whole frequency band frequency spectrum, by sampling
Obtain multiple sampling frequency, obtain according to each sampling frequency and meet pre-conditioned optimum frequency section.
Concrete, compare the acquisition of each sampling frequency value and meet pre-conditioned optimum frequency section implementation method
Can be:
By sampling frequency one frequency band of composition adjacent at least two, it is thus achieved that at least two frequency band；Its
In, each frequency band does not has identical sampling frequency.
Calculate the meansigma methods of sampling frequency in each frequency band；
Meansigma methods in each frequency band obtains and meets pre-conditioned optimum frequency section.
Preferably, pre-conditioned can be that sampling frequency meansigma methods is minimum, and namely noise energy is relatively
Weak frequency range.
Step S102: optimum frequency section is set to the operating frequency section of capacitance touch screen；
Here, described operating frequency section refers to the frequency band that capacitance touch screen is used when detecting touch signal.
Preferably, optimum frequency section is the frequency range that noise energy is relatively weak, so, touches electricity user
The when of holding touch screen, capacitance touch screen detects just for touch signal, thus can be well
Avoid noise signal and the interference signal impact on touch signal.
Step S103: detect whether to receive touch signal in operating frequency section.
The method of the capacitance touch screen identification touch signal that the embodiment of the present invention provides, first from capacitance touch screen
The current environment at place selects to meet pre-conditioned optimum frequency section, and this optimum frequency section is arranged
Operating frequency section for described capacitance touch screen；Thus, capacitance touch screen can only receive at described optimal frequency
Signal in rate section or noise, the noise in the range of other does not receives, namely according to capacitive touch
The change of the current environment full frequency band frequency touching screen place judges whether to receive touch signal, is substantially
Carry out judging according to the change of signal and noise frequency in this optimum frequency section, thus reached to improve and know
The purpose of other touch signal.Further, if described optimum frequency section does not interferes with signal and environment
Noise signal, so, capacitance touch screen detects signal in optimum frequency and almost only has touch signal, from
And reach to identify more accurately the purpose of touch signal.
Embodiment two
Refer to Fig. 2, the second capacitance touch screen identification touch signal disclosed in the embodiment of the present invention
The flow chart of method, the method includes:
Step S201: determine and meet pre-conditioned optimum frequency in the current environment at capacitance touch screen place
Section；
Here, described pre-conditioned can be the most weak frequency range of noise energy.
Step S202: optimum frequency section is set to the operating frequency section of capacitance touch screen；
Step S203: detect whether to receive touch signal in operating frequency section；
Step S204: calculate signal to noise ratio when arriving at preset time intervals；
Wherein, described signal to noise ratio is the institute that the energy of the touch signal received receives with capacitance touch screen
There is the ratio of signal energy.
Step S205: compare when whether current signal arrives less than previous predetermined time interval and calculate
Signal to noise ratio, if it is, return step S201, if it is not, then return step S203.
In the optimum frequency section determined sometime, it is not necessarily optimum frequency section at other times.Such as,
The frequency range i.e. optimum frequency section relatively weak 9 noise energies determined is 10KHz-50KHz, but
Some environment noises, optimum frequency at this moment is added in 10KHz-50KHz frequency range when 9: 10 seconds
Section is just not necessarily 10KHz-50KHz, it may be possible to 70KHz-100KHz.
The method of the capacitance touch screen identification touch signal that the embodiment of the present invention provides, the most only embodiment one
In advantage, but also when can arrive at preset time intervals, judge that previously determined optimum frequency section exists
Whether remain as optimum frequency section in current time, so, will more adapt to the change of noise in environment.
Embodiment three
Describing method in detail in the invention described above disclosed embodiment, the method for the present invention can use
The device of various ways realizes, and therefore the invention also discloses two kinds of devices, concrete enforcement is given below
Example is described in detail.
Refer to Fig. 3, the structural representation of the first capacitance touch screen disclosed in the embodiment of the present invention,
This capacitance touch screen may include that and determines module 301, arranges module 302 and detection module 303, its
In:
Determine module 301, meet pre-conditioned in the current environment determining capacitance touch screen place
Optimum frequency section；
Determine that module 301 specifically includes: sampling unit 3011, current for capacitance touch screen place
In environment, Whole frequency band frequency spectrum is sampled, it is thus achieved that multiple sampling frequencys；And acquiring unit 3012, it is used for
Obtain according to each sampling frequency and meet pre-conditioned optimum frequency section.
Acquiring unit 3012, may include that composition subelement 30121, at least two is adjacent
Sampling frequency one frequency band of composition, it is thus achieved that at least two frequency band；
Computation subunit 30122, for calculating the meansigma methods of the sampling frequency in each frequency band；
Obtain subelement 30123, for meeting pre-conditioned according to the meansigma methods acquisition in each frequency band
Optimum frequency section；Preferably, described pre-conditioned minimum for sampling frequency value.
Module 302 is set, for optimum frequency section is set to the operating frequency section of described capacitance touch screen；
Detection module 303, for detecting whether to receive touch signal in operating frequency section.
The capacitance touch screen that the embodiment of the present invention provides, first passes through and determines that module 301 determines optimum frequency section,
By arranging module 302, this optimum frequency section is being set to the operating frequency section of described capacitance touch screen,
Thus capacitance touch screen can only receive the signal in described optimum frequency section or noise, in the range of other
Noise does not receives, and detection module 303 is according to the current environment Whole frequency band frequency at capacitance touch screen place
The change of rate judges whether to receive touch signal, is substantially according to signal in this optimum frequency section and to make an uproar
The change of acoustic frequency carries out judging, thus has reached to improve the purpose identifying touch signal.Further,
If described optimum frequency section does not interferes with signal and ambient noise signal, so, capacitance touch screen exists
Optimum frequency detects signal and almost only has touch signal, thus reach to identify more accurately touch signal
Purpose.
Embodiment four
Refer to Fig. 4, the result schematic diagram of the second capacitance touch screen disclosed in the embodiment of the present invention,
This capacitance touch screen may include that
Determine module 301, meet pre-conditioned in the current environment determining capacitance touch screen place
Optimum frequency section；
Here, described pre-conditioned can be the most weak frequency range of noise energy.
Module 302 is set, for described optimum frequency section is set to the work frequency of described capacitance touch screen
Rate section；
Detection module 303, for detecting whether to receive touch signal in described operating frequency section；
Computing module 401, in time arriving at preset time intervals, calculates signal to noise ratio, and signal to noise ratio is for connecing
The ratio of all signal energies that the energy of the touch signal received and capacitance touch screen receive；
Comparison module 402, is used for comparing whether current signal arrives less than previous predetermined time interval
Time the signal to noise ratio that calculates；
Trigger module 403, in the case of the comparative result at comparison module is for being, triggers and determines mould
Block, in the case of the comparative result of comparison module is for being, detection trigger module.
In the optimum frequency section determined sometime, it is not necessarily optimum frequency section at other times.Such as,
The frequency range i.e. optimum frequency section relatively weak 9 noise energies determined is 10KHz-50KHz, but
9: point 0 10 seconds time in 10KHz-50KHz frequency range, add some environment noises,
Good frequency band is just not necessarily 10KHz-50KHz, it may be possible to 70KHz-100KHz.
The capacitance touch screen that the embodiment of the present invention provides, the most only advantage in embodiment three, and pass through
Computing module 401, comparison module 402 and trigger module 403 can also judge previously determined optimal
Whether frequency band, remain as optimum frequency section in current time, so, will more adapt in environment
The change of noise.
The embodiment of the present invention additionally provides a kind of electronic equipment, and this electronic equipment includes that above-described embodiment is retouched
The arbitrary capacitance touch screen stated, concrete, described electronic equipment can be: mobile phone, computer and PAD.
In this specification, each embodiment uses the mode gone forward one by one to describe, and each embodiment stresses
Being the difference with other embodiments, between each embodiment, identical similar portion sees mutually.
For device disclosed in embodiment, owing to it corresponds to the method disclosed in Example, so describing
Fairly simple, relevant part sees method part and illustrates.
The method described in conjunction with the embodiments described herein or the step of algorithm can directly use hardware,
The software module that processor performs, or the combination of the two implements.Software module can be placed in and deposit at random
Reservoir (RAM), internal memory, read only memory (ROM), electrically programmable ROM, electric erasable can be compiled
Well known in journey ROM, depositor, hard disk, moveable magnetic disc, CD-ROM or technical field
In any other form of storage medium.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses
The present invention.Multiple amendment to these embodiments will be aobvious and easy for those skilled in the art
See, generic principles defined herein can without departing from the spirit or scope of the present invention,
Realize in other embodiments.Therefore, the present invention is not intended to be limited to the embodiments shown herein,
And it is to fit to the widest scope consistent with principles disclosed herein and features of novelty.
Claims (5)
1. the method for a capacitance touch screen identification touch signal, it is characterised in that described method includes:
Determine and the current environment at capacitance touch screen place meets pre-conditioned optimum frequency section；
Described optimum frequency section is set to the operating frequency section of described capacitance touch screen；
Detect whether to receive described touch signal in described operating frequency section；
Wherein, the described current environment determining capacitance touch screen place meets pre-conditioned optimum frequency section
Including: in the current environment to capacitance touch screen place, Whole frequency band frequency spectrum is sampled, it is thus achieved that multiple sampling frequencies
Rate；Obtain according to each sampling frequency and meet described pre-conditioned optimum frequency section；
Described acquisition according to each sampling frequency meets described pre-conditioned optimum frequency section, including: near
Few two adjacent sampling frequencys, one frequency band of composition, it is thus achieved that at least two frequency band；Calculate each frequency
The meansigma methods of the noise energy at sampling frequency in Duan；By comparing at the sampling frequency in each frequency band
The meansigma methods of noise energy obtain and meet pre-conditioned optimum frequency section, described pre-conditioned for sampling frequency
The meansigma methods of the noise energy at rate is minimum.
Method the most according to claim 1, it is characterised in that detection is in described operating frequency section
No receive described touch signal step after, described method also includes:
When arriving at preset time intervals, calculate signal to noise ratio；Described signal to noise ratio is the touch signal received
The ratio of all signal energies that energy receives in described optimum frequency section with described capacitance touch screen；
The signal to noise ratio that relatively whether current signal calculates when arriving less than previous predetermined time interval, as
Fruit is the most again to determine and meet pre-conditioned operating frequency section in the current environment at capacitance touch screen place,
If it is not, then described capacitance touch screen continues to detect whether to receive described touch signal.
3. a capacitance touch screen, it is characterised in that described capacitance touch screen includes:
Determine module, in the current environment determining capacitance touch screen place, meet pre-conditioned optimal frequency
Rate section；
Module is set, for described optimum frequency section is set to the operating frequency section of described capacitance touch screen；
Detection module, for detecting whether to receive touch signal in described operating frequency section；
Wherein, described determine that module includes: sampling unit, for the current environment to capacitance touch screen place
Middle Whole frequency band frequency spectrum is sampled, it is thus achieved that multiple sampling frequencys；Acquiring unit, for according to each sampling frequency
Rate obtains and meets described pre-conditioned optimum frequency section；
Described acquiring unit includes: composition subelement, for by sampling frequency composition one adjacent at least two
Individual frequency band, it is thus achieved that at least two frequency band；Computation subunit, for calculating the sampling in each frequency band
The meansigma methods of the noise energy at frequency；Obtain subelement, for by sampling in comparing each frequency band frequently
The meansigma methods of the noise energy at rate obtains and meets pre-conditioned optimum frequency section, described pre-conditioned for taking out
The meansigma methods of the noise energy at sample frequency is minimum.
Capacitance touch screen the most according to claim 3, it is characterised in that described capacitance touch screen also wraps
Include:
Computing module, in time arriving at preset time intervals, calculates signal to noise ratio；Described signal to noise ratio is for receiving
To all letters of receiving in described optimum frequency section of energy and the described capacitance touch screen of touch signal
The ratio of number energy；
Comparison module, is used for comparing calculating when whether current signal arrives less than previous predetermined time interval
The signal to noise ratio gone out；
Trigger module, in the case of at the comparative result of described comparison module for being, triggers and described determines
Module, in the case of the comparative result of described comparison module is for being, triggers described detection module.
5. an electronic equipment, it is characterised in that include the capacitance touch screen described in claim 3 or 4.
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104571732B (en) * | 2013-10-14 | 2018-09-21 | 深圳市汇顶科技股份有限公司 | Touch terminal, active stylus detection method and system |
| CN105659197B (en) * | 2014-01-26 | 2019-07-23 | 华为终端有限公司 | A kind of disturbance restraining method of touch screen, device and terminal device |
| CN105320319A (en) * | 2014-06-30 | 2016-02-10 | 晨星半导体股份有限公司 | Touch device and control method of touch electronic system |
| TWI531141B (en) * | 2015-01-12 | 2016-04-21 | 友達光電股份有限公司 | Noise eliminating method and adapter |
| CN105677099B (en) * | 2016-01-05 | 2018-09-21 | 京东方科技集团股份有限公司 | Method and system for the working frequency range for setting touch detecting system |
| CN105528117B (en) * | 2016-01-28 | 2019-02-19 | 青岛海信移动通信技术股份有限公司 | A kind of acquisition methods and device of touch screen scan frequency |
| CN107506067B (en) * | 2017-07-24 | 2020-02-21 | Oppo广东移动通信有限公司 | Method and device for debugging working frequency of touch screen and terminal equipment |
| CN109753174A (en) * | 2017-11-06 | 2019-05-14 | 中华映管股份有限公司 | Touch device and its touching signals processing method |
| CN110214302B (en) * | 2017-12-28 | 2022-09-16 | 深圳市汇顶科技股份有限公司 | Noise elimination circuit and touch device |
| CN114925014B (en) * | 2022-05-24 | 2024-03-26 | 深圳市爱协生科技股份有限公司 | Capacitive touch serial port screen capable of self-adapting to strong electric interference |
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| CN1197555A (en) * | 1996-07-12 | 1998-10-28 | 辛纳普蒂克斯有限公司 | Object position detector with noise suppression feature |
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