CN103777821B - Anti-interference method and device for touch system - Google Patents
Anti-interference method and device for touch system Download PDFInfo
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Abstract
The invention provides an anti-interference method and device for a touch system. The anti-interference method and device for the touch system aim to solve the problem that touch position judgment is influenced when the signal intensity of external natural light is changed sharply. The method comprises the steps of detecting the signal intensity of the natural light, judging whether the changing amplitude of the intensity of the natural light exceeds a preset amplitude threshold value or not, detecting the signal intensity of infrared light if the changing amplitude of the intensity of the natural light exceeds the preset amplitude threshold value, judging whether the signal intensity of the infrared light meets an adjusting condition or not, and adjusting a touch threshold value for judging touch positions if the signal intensity of the infrared light meets the adjusting condition. According to the anti-interference method and device for the touch system, when the signal intensity of the natural light is changed sharply, the touch threshold value can be adjusted timely, the touch threshold value is made to be adaptive to touch position judgment under the current intensity of the natural light, the touch position judged according to the adjusted touch threshold value is more accurate, and interference generated on the touch position judgment by the sharp change of the external natural light is avoided.
Description
Technical field
The present invention relates to technical field of touch control, particularly relate to the anti-interference method and of a kind of touch-control system
Plant the noise trap of touch-control system.
Background technology
Along with developing rapidly of science and technology, the application of touch technology is more and more universal.Such as, withdraw the money at present
A lot of equipment such as machine, computer, mobile phone, digital camera, television set is both provided with touch-control system.User
On the touch screen of touch-control system touch, touch-control system i.e. may recognize that correspondence information, thus reduce right
The dependence of other input equipment (such as keyboard, mouse, remote controller etc.), user friendly operation.Touch-control
System generally has the polytypes such as resistance-type, condenser type, ultrasonic type and infrared type, its mid-infrared touch-control
System because having that technology is simple, the feature of low cost and be widely used.
Infrared touch-control system includes MCU(Micro Control Unit, micro-control unit) and uniformly divide
Cloth is at the infrared tube (including infrared transmitting tube and infrared receiving tube) of touch screen surrounding, in infrared tube
Infrared transmitting tube launch infrared light, infrared receiving tube receive this infrared light, infrared transmitting tube and infrared
Receive pipe one_to_one corresponding and form the infrared light net anyhow intersected.
When touch-control system normally works, MCU detects the letter of the infrared light that infrared receiving tube receives in real time
Number intensity, when user carries out touch control operation on touch screen, will stop infrared transmitting tube and infrared receiver
The path of pipe, so that the signal strength weakening of infrared light that infrared receiving tube receives.When MCU examines
When measuring the signal intensity of the infrared light that infrared receiving tube receives less than touch-control threshold value, i.e. can determine that this is red
The position that emission pipe is corresponding with infrared receiving tube is position of touch.
Owing to infrared touch-control system uses under nature light, containing a large amount of infrared lights in natural light, the external world is certainly
So the infrared light in light also can be irradiated to infrared receiving tube, in the infrared light that therefore infrared receiving tube receives
Also the infrared light in the extraneous natural light of a part can be included.When the signal intensity of external world's nature light occurs acutely
During change, the signal intensity of the infrared light that infrared receiving tube receives also can occur acute variation, therefore will
The signal intensity of the infrared light that MCU can be detected produces considerable influence, thus sentences position of touch
The raw interference of pregnancy ceased.
For the problems referred to above, following two method is the most generally used to reduce nature light to infrared touch-control system
The impact of system:
(1) on infrared tube, add protection housing, infrared tube is hidden in inside protection housing, from
And make the infrared light in extraneous natural light cannot shine directly into infrared receiver tube-surface；
(2) dead ahead at infrared tube adds smooth optical filtering bar at an angle, thus filters
Need not the light of wavelength, the extraneous natural light of a part can also be reflected simultaneously.
Above two method is all to be controlled by the luminous flux of the extraneous natural light of directly reduction.But,
When the change in signal strength of external world's nature light is more violent, the infrared light still suffering from various frequency can
Direct projection or reflex on infrared receiving tube, so that the signal of infrared light that infrared receiving tube receives is strong
Also there is acute variation in degree, affects the judgement of position of touch.
Summary of the invention
The invention provides the anti-interference method of a kind of touch-control system and the anti-interference dress of a kind of touch-control system
Put, to solve when the signal intensity generation acute variation of external world's nature light, affect what position of touch judged
Problem.
In order to solve the problems referred to above, the invention discloses the anti-interference method of a kind of touch-control system, its feature
It is, including:
The signal intensity of detection nature light；
Judge whether the amplitude of variation of the signal intensity of described natural light exceedes default amplitude threshold；
If exceeding, then detect the signal intensity of infrared light；
Judge whether the signal intensity of described infrared light meets regularization condition；
If meeting, then adjust the touch-control threshold value for judging position of touch.
Preferably, described natural light is the natural light that light sensation receives, and described infrared light is infrared receiving tube
The infrared light received；
The step of the signal intensity of described detection nature light includes:
The signal intensity of the natural light that per interval T light sensation of detection receives；
Wherein, T is more than the time that described infrared receiving tube carries out single pass；To all infrared receiver
The signal strength detection of the infrared light that pipe receives is once for single pass.
Preferably, whether the amplitude of variation at the signal intensity judging described natural light exceedes default amplitude
Before threshold value, also include:
According to presetting rule, the signal intensity of natural light is divided into M interval, wherein M >=1；
Whether the amplitude of variation of the described signal intensity judging described natural light exceedes default amplitude threshold
Step include:
Judge the signal intensity of the signal intensity of this natural light detected and the natural light of front one-time detection
Whether it is positioned at same interval；
If being not in same interval, it is determined that the amplitude of variation of the signal intensity of described natural light surpasses
Cross the amplitude threshold preset；
If being positioned at same interval, it is determined that the amplitude of variation of the signal intensity of described natural light does not surpass
Cross the amplitude threshold preset.
Preferably, the step of the signal intensity of described detection infrared light includes:
Described infrared receiving tube carries out Y scanning, and detection scanning mid-infrared every time receives what pipe received
The signal intensity of infrared light, wherein Y >=1.
Preferably, whether the described signal intensity judging described infrared light meets the step bag of regularization condition
Include:
Calculate the meansigma methods of the signal intensity of the infrared light of detection in described Y scanning；
Judge whether described meansigma methods is positioned in default threshold interval [α V, β V], wherein 1 ＜ α ＜ β,
V is described for judging the touch-control threshold value of position of touch；
If in being not at [α V, β V], it is determined that the signal intensity of described infrared light meets regularization condition.
Preferably, described adjustment includes for the step judging the touch-control threshold value of position of touch:
If described meansigma methods is less than α V, then reduce described touch-control threshold value V, until described meansigma methods is more than
Or equal to α V；
If described meansigma methods is more than β V, then increase described touch-control threshold value V, until described meansigma methods is less than
Or equal to β V.
Preferably, before the signal intensity of detection nature light, also include:
Described infrared receiving tube is carried out normal scan, the letter of the infrared light that detection infrared receiving tube receives
Number intensity；
Determine tactile according to signal intensity and the described touch-control threshold value of the infrared light of detection in described normal scan
Control position；
The step bag of the meansigma methods of the signal intensity of the infrared light of detection in described Y the scanning of described calculating
Include:
Determine that corresponding infrared of the position of touch that determines in the previous subnormal scanning of described Y scanning connects
Closed tube；
Described position of touch is deleted corresponding from the signal intensity of the infrared light of described Y Scanning Detction
The signal intensity of the infrared light that infrared receiving tube receives；
Calculating the meansigma methods of the signal intensity of remaining infrared light, result of calculation is to examine in described Y scanning
The meansigma methods of the signal intensity of the infrared light surveyed.
According to a further aspect in the invention, also disclose the noise trap of a kind of touch-control system, its feature
It is, including:
First detection module, for detecting the signal intensity of nature light；
First judge module, for judging whether the amplitude of variation of the signal intensity of described natural light exceedes pre-
If amplitude threshold；
Second detection module, for when the judged result of described first judge module is for exceeding, detects red
The signal intensity of outer light；
Second judge module, for judging whether the signal intensity of described infrared light meets regularization condition；
Adjusting module, for when the judged result of described second judge module is for meeting, adjusts and is used for sentencing
The touch-control threshold value of disconnected position of touch.
Preferably, described natural light is the natural light that light sensation receives, and described infrared light is infrared receiving tube
The infrared light received；
Described first detection module, the natural light received specifically for per interval T light sensation of detection
Signal intensity；
Wherein, T is more than the time that described infrared receiving tube carries out single pass；To all infrared receiver
The signal strength detection of the infrared light that pipe receives is once for single pass.
Preferably, described device also includes:
Divide module, for judging the change of the signal intensity of described natural light at described first judge module
Before whether amplitude exceedes default amplitude threshold, according to presetting rule, the signal intensity of natural light is divided
Interval for M, wherein M >=1；
Described first judge module includes:
First judges submodule, for judging the signal intensity of this natural light detected and front one-time detection
The signal intensity of natural light whether be positioned at same interval；
First determines submodule, same as being not at for judging the judged result of submodule described first
Time in one interval, determine that the amplitude of variation of the signal intensity of described natural light exceedes default amplitude threshold
Value；When described first judges the judged result of submodule as being positioned at same interval, determine described from
So the amplitude of variation of the signal intensity of light is not above the amplitude threshold preset.
Preferably, described second detection module, specifically for described infrared receiving tube being carried out Y scanning,
Detection scanning mid-infrared every time receives the signal intensity of the infrared light that pipe receives, wherein Y >=1.
Preferably, described second judge module includes:
Calculating sub module, for calculating the average of the signal intensity of the infrared light detected in described Y scanning
Value；
Second judges submodule, for judge described meansigma methods whether be positioned at default threshold interval [α V,
β V] in, wherein 1 ＜ α ＜ β, V are described for judging the touch-control threshold value of position of touch；
Second determines submodule, for judging that the judged result of submodule is as being not at described second
When [α V, β V] is interior, determine that the signal intensity of described infrared light meets regularization condition.
Preferably, described adjusting module includes:
Reduce submodule, for when described meansigma methods is less than α V, reducing described touch-control threshold value V, directly
To described meansigma methods more than or equal to α V；
Increase submodule, for when described meansigma methods is more than β V, increasing described touch-control threshold value V, directly
To described meansigma methods less than or equal to β V.
Compared with prior art, the present invention includes advantages below:
The present invention signal intensity of natural light to external world can detect, and judge described natural light
Whether the amplitude of variation of signal intensity exceedes default amplitude threshold, if it does, then can detect infrared
The signal intensity of light, and judge whether the signal intensity of described infrared light meets regularization condition, at satisfied tune
During shelf-regulating Conditions, then adjust the touch-control threshold value for judging position of touch.Due to the change according to external world's nature light
Touch-control threshold value is adjusted by change amplitude, therefore when the signal intensity generation acute variation of natural light, and can
To adjust touch-control threshold value in time so that it is adapt to the position of touch under current Natural light intensity degree and judge, according to tune
The position of touch that touch-control threshold decision after whole goes out is more accurate, it is to avoid the acute variation of extraneous natural light
Position of touch is judged the interference produced.
Accompanying drawing explanation
Fig. 1 is the structural representation of prior art mid-infrared touch-control system；
Fig. 2 is the schematic diagram that in prior art, touching object carries out touch control operation on touch screen；
Fig. 3 is the flow chart of the anti-interference method of a kind of touch-control system of the embodiment of the present invention one；
Fig. 4 is the schematic diagram that in the embodiment of the present invention two, touching object carries out touch control operation on touch screen；
Fig. 5 is the flow chart of the anti-interference method of a kind of touch-control system of the embodiment of the present invention two；
Fig. 6 is the structured flowchart of the noise trap of a kind of touch-control system of the embodiment of the present invention three.
Detailed description of the invention
Understandable, below in conjunction with the accompanying drawings for enabling the above-mentioned purpose of the present invention, feature and advantage to become apparent from
The present invention is further detailed explanation with detailed description of the invention.
As it is shown in figure 1, be the structural representation of prior art mid-infrared touch-control system.Infrared touch-control system
Including MCU and the infrared transmitting tube and the infrared receiving tube that are evenly distributed on touch screen surrounding, infrared tube
In infrared transmitting tube launch infrared light, infrared receiving tube receive this infrared light, infrared transmitting tube and red
External closed tube one_to_one corresponding forms the infrared light net anyhow intersected.MCU is used for detecting infrared receiving tube and connects
The signal intensity of the infrared light received, judges position of touch by this signal intensity.
Fig. 2 is the schematic diagram that in prior art, touching object carries out touch control operation on touch screen.According to figure
2, when carrying out touch control operation, touching object will stop leading between infrared transmitting tube and infrared receiving tube
Road, under conditions of touch-control system normally works, MCU is red by detecting that infrared receiving tube receives
The signal strength weakening of outer light, if MCU detects the infrared light that certain infrared receiving tube receives
Signal intensity is less than touch-control threshold value, then may determine that the position that this infrared receiving tube is corresponding is position of touch.
Such as in Fig. 2, touch-control system includes 1,2 ..., a ..., b ..., N is N number of the most infrared
Receive pipe, and with receive pipe one to one 1,2 ..., a ..., b ..., N, altogether N
Individual infrared transmitting tube.MCU detects the signal intensity of the infrared light that infrared receiving tube a and b receive
Less than touch-control threshold value, thus may determine that path between infrared transmitting tube a and infrared receiving tube a, with
And the intersection point of the path between infrared transmitting tube b and infrared receiving tube b is position of touch.
But, containing a large amount of infrared lights in extraneous natural light, extraneous infrared light (i.e. infrared in nature light
Light) infrared receiving tube can also be irradiated to, outside the infrared light that therefore infrared receiving tube receives also includes
Boundary's infrared light.Therefore, when the change in signal strength of external world's nature light is more violent, infrared receiver is caused
Also there is acute variation in the signal intensity of the infrared light that pipe receives, thus affects the judgement of position of touch.
For the problems referred to above, the present invention proposes the anti-interference method of a kind of touch-control system and a kind of touch-control system
The noise trap of system, can adjust touch-control threshold value in time for the intensity of variation of external world's nature light, from
And avoid judging to produce impact on position of touch.
Below, by each embodiment following to the anti-interference method of the touch-control system that the present invention proposes and dress
Put and describe in detail.
Embodiment one:
With reference to Fig. 3, it is shown that the flow process of the anti-interference method of a kind of touch-control system of the embodiment of the present invention one
Figure, the method specifically may comprise steps of:
Step 301, the signal intensity of detection nature light.
Owing to the infrared light in external world's nature light also can be received by infrared receiving tube, therefore natural in the external world
When the change in signal strength of light is violent, it will the signal intensity of the infrared light receiving infrared receiving tube produces
Raw large effect.Therefore, in the embodiment of the present invention, can the signal intensity of natural light to external world carry out
Detection, to perform corresponding operating according to the different of natural light signal strength.
Step 302, it is judged that whether the amplitude of variation of the signal intensity of described natural light exceedes default amplitude
Threshold value.
After detecting the signal intensity of extraneous natural light, then may determine that the signal of described natural light is strong
Whether the amplitude of variation of degree exceedes default amplitude threshold.If it exceeds the amplitude threshold preset, the most permissible
Illustrate that the signal intensity of nature light there occurs acute variation, now, the signal intensity of infrared light can be detected；
Without exceeding default amplitude threshold, then can illustrate that the signal intensity of nature light does not occur acutely
Change, now can perform normal position of touch judge process.
Step 303, if exceeding, then detects the signal intensity of infrared light.
Step 304, it is judged that whether the signal intensity of described infrared light meets regularization condition.
Step 305, if meeting, then adjusts the touch-control threshold value for judging position of touch.
After the signal intensity detecting infrared light, whether i.e. can determine whether the signal intensity of described infrared light
Meeting regularization condition, if meeting regularization condition, then can adjust the touch-control threshold for judging position of touch
Value.Thus when carrying out position of touch and judging, can judge according to the touch-control threshold value after adjusting, with
Adapt to the change of extraneous natural light.
In the embodiment of the present invention, owing to touch-control threshold value being adjusted according to the amplitude of variation of external world's nature light
Whole, therefore when Natural light intensity degree generation acute variation, touch-control threshold value can be adjusted in time so that it is adapt to
Position of touch under current Natural light intensity degree judges, the touch-control position gone out according to the touch-control threshold decision after adjusting
It is more accurate to put, it is to avoid the acute variation of extraneous natural light judges the interference produced to position of touch.
Embodiment two:
With reference to Fig. 4, it is shown that in the embodiment of the present invention two, touching object carries out touch control operation on touch screen
Schematic diagram.
According to Fig. 4, infrared touch-control system may include that MCU, infrared penetrate send out pipe, infrared receiving tube and
Light sensation, wherein, infrared transmitting tube and infrared receiving tube one_to_one corresponding are distributed in the surrounding of touch screen, MCU
It is connected with infrared transmitting tube and infrared receiving tube respectively, for detecting the infrared light that infrared receiving tube receives
Signal intensity, MCU is also connected with light sensation, strong for detecting the signal of the natural light that light sensation receives
Degree.Infrared transmitting tube can launch the infrared receiving tube that infrared light is the most corresponding, due to external world's nature light
In also include a large amount of extraneous infrared light, therefore, infrared receiving tube can also receive extraneous infrared light.
In the embodiment of the present invention, described light sensation can be infrared light transducer[sensor, is mainly used in receiving the external world certainly
So infrared light in light, described light sensation can also be general visible sensor, is mainly used in receiving the external world
Natural light (if extraneous natural light generation acute variation, then extraneous infrared light also can occur acute variation),
This is not any limitation as by the embodiment of the present invention.
With reference to Fig. 5, it is shown that the flow process of the anti-interference method of a kind of touch-control system of the embodiment of the present invention two
Figure, the method specifically may comprise steps of:
Step 501, carries out normal scan to infrared receiving tube, and it is infrared that detection infrared receiving tube receives
The signal intensity of light.
When infrared touch-control system normally works, infrared transmitting tube launches infrared light, and infrared receiving tube will connect
Receive the infrared light that infrared transmitting tube is launched, and infrared receiving tube is also possible to receive in extraneous natural light
Including extraneous infrared light.MCU will carry out normal scan to infrared receiving tube, detect infrared receiving tube
The signal intensity of the infrared light received, judges position of touch with the signal intensity according to described infrared light.
In the embodiment of the present invention, infrared touch-control system includes multiple infrared transmitting tube and infrared receiving tube,
MCU is once single pass to the signal strength detection of the infrared light that all infrared receiving tubes receive.
During normal scan, after single pass is complete, i.e. may determine that the position of touch in this scanning.
Step 502, according to signal intensity and the described touch-control threshold of the infrared light detected in described normal scan
Value determines position of touch.
After a normal scan process terminates, MCU can be red according to detect in described normal scan
Signal intensity and the described touch-control threshold value of outer light determine position of touch.In a preferred embodiment of the present invention
In, this infrared receiving tube detected can be received by MCU for each infrared receiving tube
The signal intensity of infrared light compares with touch-control threshold value.If it is judged that what this infrared receiving tube received
The signal intensity of infrared light be less than touch-control threshold value, then may determine that this infrared receiving tube be touched object resistance
Gear, the position of its correspondence is position of touch；If it is judged that the infrared light that receives of this infrared receiving tube
Signal intensity be more than or equal to touch-control threshold value, then may determine that this infrared receiving tube be not touched object resistance
Gear.
As shown in Figure 4, infrared transmitting tube and infrared receiving tube are evenly distributed on the surrounding of touch screen, along
The top edge of touch screen arranges a line infrared receiving tube, and the lower limb along touch screen arranges a line and top
The infrared transmitting tube that the infrared receiving tube of edge is corresponding, the left hand edge along touch screen arranges string infrared receiver
Pipe, the right hand edge along touch screen arranges the infrared emission that string is corresponding with the infrared receiving tube of left hand edge
Pipe.Therefore, the path between infrared receiving tube and the infrared transmitting tube of lower limb of top edge, with the left side
Path between infrared receiving tube and the infrared transmitting tube of right hand edge of edge intersects to form light net.Work as touch objects
When body touches touch screen, certain or certain the several infrared receiving tubes simultaneously stopping top edge are received lower limb
The infrared light that corresponding infrared transmitting tube is launched, and certain or certain several infrared receiving tubes of left hand edge connect
Receive the infrared light that infrared transmitting tube corresponding to right hand edge is launched.Therefore, the infrared of the top edge being blocked connects
Path between closed tube and the infrared transmitting tube of lower limb, with the infrared receiving tube of the left hand edge being blocked and
The cross point of the path between the infrared transmitting tube of right hand edge is position of touch.
Such as, as shown in Figure 4, can be each infrared transmitting tube and infrared receiving tube is numbered, red
Emission pipe is identical with the numbering of corresponding infrared receiving tube, such as the volume of the infrared receiving tube of top edge
Number be respectively 1,2 ..., a ..., the numbering of the infrared receiving tube of left hand edge be respectively ..., b ...,
The N(i.e. sum of infrared receiving tube is N).Receive infrared owing to touching object blocks infrared receiving tube a
Infrared light and infrared receiving tube b that transmitting tube a launches receive the infrared light that infrared transmitting tube b launches,
Therefore MCU detects what the infrared receiving tube a of top edge and the infrared receiving tube b of left hand edge received
The signal intensity of infrared light be less than touch-control threshold value, therefore judge position of touch be (a, b).
For the concrete value of described touch-control threshold value, those skilled in the art are correlated with according to practical experience
Setting, concrete numerical value is not any limitation as by the embodiment of the present invention.
Step 503, the signal intensity of the natural light that per interval T light sensation of detection receives is (the most real
Execute the step 301 in example one).
To touch-control position during the extraneous natural light generation acute variation of the purpose of the embodiment of the present invention mainly reduction
Put the interference judging to produce.Therefore, it can the light increased in touch-control system for receiving extraneous natural light
Sense, this light sensation is connected with MCU, and therefore, MCU can detect the letter of the natural light that light sensation receives
Number intensity.
In the embodiment of the present invention, MCU can during infrared receiving tube is carried out normal scan,
The signal intensity of the natural light that per interval T light sensation of detection receives, the signal intensity to natural light
Detection process do not affect the normal scan in above-mentioned steps 501～step 502, determine the mistake of position of touch
Journey.
For time T selection can not excessive can not be too small, if excessive, then in real time detection not
Meaningful；If too small, then may also be not fully complete detection, judge, adjust the processes such as threshold value.Therefore exist
In a preferred embodiment of the present invention, could be arranged to T more than described infrared receiving tube is carried out once
The time (such as can be more than 2 to 3 times of the single pass time) of scanning, and less than mainly causing
The time (time of touch screen is blocked in the movement of such as user) of natural light acute variation.
Step 504, it is judged that whether the amplitude of variation of the signal intensity of described natural light exceedes default amplitude
Threshold value.If it does, then perform step 505；If not less than, then return and perform step 501, continue
Continue and carry out normal scan.
After the signal intensity of natural light that light sensation receives being detected, it can be determined that extraneous natural light
Whether signal intensity there is acute variation, in the embodiment of the present invention, and can be by judging described natural light
Whether the amplitude of variation of signal intensity exceedes default amplitude threshold judges whether acute variation.
In one preferred embodiment of the invention, at the change width of the signal intensity judging described natural light
Before whether degree exceedes default amplitude threshold, it is also possible to including: according to presetting rule by the letter of natural light
Number intensity be divided into M interval, each interval is properly termed as U1, U2... UM, wherein M >=1.
Such as, the highest anti-interference of touch-control system is the unit of intensity of illumination for 80000Lx(Lx) natural
Light, by from signal intensity conversion (binaryzation) without light natural under natural light to 80000LX nature light
For numerical value 0～1024, can be 5 intervals [0,205] by this numerical division, [206,410], [411,
615], [615,820], [821,1024].
In the embodiment of the present invention, this step 504 can include following sub-step:
Sub-step a1, it is judged that the signal intensity of the natural light of this detection and the natural light of front one-time detection
Whether signal intensity is positioned at same interval；
Sub-step a2, if being not in same interval, it is determined that the signal intensity of described natural light
Amplitude of variation exceedes default amplitude threshold；
Sub-step a3, if being positioned at same interval, it is determined that the change of the signal intensity of described natural light
Amplitude is not above the amplitude threshold preset.
Due to the signal intensity of the natural light that per interval T light sensation of detection receives, therefore can lead to
Cross and judge that the signal intensity of this natural light detected with the signal intensity of the natural light of front one-time detection is
No it is positioned at same interval, judges whether the amplitude of variation of the signal intensity of described natural light exceedes pre-
If amplitude threshold.If located in same interval, then the signal intensity of described natural light can be described
Amplitude of variation less, without being positioned at same interval, then the letter of described natural light can be described
The amplitude of variation of number intensity is bigger.
Step 505, carries out Y scanning to described infrared receiving tube, and detection scanning mid-infrared every time receives
The signal intensity (i.e. step 303 in embodiment one) of the infrared light that pipe receives.
If step 504 detecting, the amplitude of variation of the signal intensity of described natural light exceedes default width
Degree threshold value, then can temporarily cease the normal scan to infrared receiving tube, enters the process of Y scanning.
During scanning at Y time, the infrared light that infrared receiving tube receives can be detected in every time scanning
Signal intensity (in this Y time scanning, do not judge position of touch, do not record the position of all infrared tubes).
Such as, in scanning at Y time, the signal of the infrared light that each infrared receiving tube of detection receives is strong
Degree is recorded as respectively: A11, A21... AN1, A12, A22……AN2, A1Y, A2Y……ANY
(wherein, N is total number of infrared receiving tube, and Y is the total degree of scanning).
Selection for Y can not be excessive, if excessive, then mean that sky flyback time is long, easily causes disconnected
Line, lose a mistake.The most in one preferred embodiment of the invention, Y >=1, in order to not affect user
Normal operating, Y value can select 2 or 3.
Step 506, it is judged that whether the signal intensity of described infrared light meets regularization condition.If it is satisfied,
Then perform step 507；If be unsatisfactory for, then return and perform step 501, proceed normal scan.
After Y time is scanned, the infrared light that can receive according to the infrared receiving tube of detection in Y scanning
Signal intensity, it is judged that whether the signal intensity of described infrared light meets regularization condition.
In one preferred embodiment of the invention, this step 506 can include following sub-step:
Sub-step b1, calculates the meansigma methods of the signal intensity of the infrared light of detection in described Y scanning；
Sub-step b2, it is judged that whether described meansigma methods is positioned in default threshold interval [α V, β V], its
In 1 ＜ α ＜ β, the sample reference voltage of β V≤MCU, V is described for judging touching of position of touch
Control threshold value；
Sub-step b3, if in being not at [α V, β V], it is determined that the signal intensity of described infrared light is full
Foot regularization condition；If in being positioned at [α V, β V], it is determined that the signal intensity of described infrared light is unsatisfactory for adjusting
Condition.
Owing to the speed of Y scanning is exceedingly fast, therefore within the time of this Y time scanning, touching object is also
Have not enough time to change position, it can be considered that stop when this Y time scanning previous subnormal is scanned
Infrared tube is the same with the infrared tube stopped in this Y time scanning process.
The most above-mentioned sub-step b1 can include suddenly:
B11, determines corresponding red of the position of touch that determines in the previous subnormal scanning of described Y scanning
External closed tube；
B12, deletes described position of touch pair from the signal intensity of the infrared light of described Y Scanning Detction
The signal intensity of the infrared light that the infrared receiving tube answered receives；
B13, calculates the meansigma methods of the signal intensity of remaining infrared light, and result of calculation is to sweep for described Y time
Retouch the meansigma methods of the signal intensity of the infrared light of middle detection.
Such as, in scanning at Y time, the signal of the infrared light that each infrared receiving tube of detection receives is strong
Degree is recorded as respectively: A11, A21... AN1, A12, A22……AN2, A1Y, A2Y……ANY,
The infrared receiving tube that the position of touch that determines is corresponding in the previous subnormal scanning of this Y time scanning is a,
B ... this m of a+m, then the infrared light that this m infrared receiving tube receives in this scanning of Y
Signal intensity be: Aa1, Ab1... A(a+m)1, Aa2, Ab2……A(a+m)2, AaY, AbY……
A(a+m)Y.Therefore in Y scanning, meansigma methods A of the signal intensity of the infrared light of detection is:
Step 507, adjusts the touch-control threshold value for judging position of touch.
If step 506 being judged, the signal intensity of described infrared light meets regularization condition, then can be right
Touch-control threshold value is adjusted, and after adjustment, i.e. can return to proceed in step 501 normal scan process,
Therefore position of touch can be carried out according to the touch-control threshold value after adjusting during upper normal scan once
Judgement.
In one preferred embodiment of the invention, this step 507 can include following sub-step:
Sub-step c1, if described meansigma methods is less than α V, then reduces described touch-control threshold value V, until described
Meansigma methods is more than or equal to α V；
If the meansigma methods A ＜ α V of the signal intensity of the infrared light of detection, then show in described Y scanning
Extraneous infrared light interference this moment relatively low (have object to stop nature light before such as touch screen, natural light not according to
It is mapped on infrared receiving tube), cause the signal intensity of the infrared light that infrared receiving tube receives to diminish.If
Do not make any adjustments, it is possible to causing when not having any touching object to enter in touch area, it is infrared
The signal intensity receiving the infrared light that pipe receives still is below touch-control threshold value V, and system still can be judged to
Touch control operation, causes maloperation.Therefore as A ＜ α V, touch-control threshold value V can be reduced, until A >=
α V, so that it is guaranteed that be not result in maloperation when the infrared light in external environment reduces suddenly.
Sub-step c2, if described meansigma methods is more than β V, then increases described touch-control threshold value V, until described
Meansigma methods is less than or equal to β V.
If the meansigma methods A ＞ β V of the signal intensity of the infrared light of detection, then show in described Y scanning
The infrared light of external interference is relatively strong, on more extraneous Infrared irradiation to infrared receiving tube, causes infrared
The average signal strength receiving pipe is bigger.If there being touching object to enter in touch area, stop the most infrared
Path to pipe, the signal intensity of the infrared light that this infrared receiving tube receives reduces, but due to the external world
The infrared light of interference is relatively strong, may cause the signal intensity of the infrared light that this infrared receiving tube receives this moment
It is not lowered to below touch-control threshold value V, it is therefore desirable to adjust touch-control threshold value V.Therefore as A ＞ β V,
Then can increase touch-control threshold value V, until A≤β V, so that it is guaranteed that after touching object stops infrared tube,
The signal intensity of the infrared light that its infrared receiving tube receives is less than touch-control threshold value V, therefore can accurately sentence
Disconnected touch location.
In the embodiment of the present invention, can be according to the amplitude of variation of the signal intensity of external world's nature light to touch-control threshold
Value is adjusted, and then can carry out touch-control position according to the touch-control threshold value after adjusting during normal scan
The judgement put, thus avoid the acute variation of extraneous natural light that position of touch judges the interference produced, carry
The accuracy that high touch-control judges.
For aforesaid each method embodiment, in order to be briefly described, therefore it is all expressed as a series of dynamic
Combining, but those skilled in the art should know, the present invention is not by described sequence of movement
Limiting, because according to the present invention, some step can use other orders or carry out simultaneously.Secondly,
Those skilled in the art also should know, embodiment described in this description belongs to preferred embodiment,
Necessary to involved action and the module not necessarily present invention.
Embodiment three:
With reference to Fig. 6, it is shown that the structure of the noise trap of a kind of touch-control system of the embodiment of the present invention three
Block diagram, this device specifically can include with lower module:
First detection module 601, for detecting the signal intensity of nature light；
First judge module 602, for judging whether the amplitude of variation of the signal intensity of described natural light surpasses
Cross the amplitude threshold preset；
Second detection module 603, for when the judged result of described first judge module is for exceeding, examines
Survey the signal intensity of infrared light；
Second judge module 604, for judging whether the signal intensity of described infrared light meets regularization condition；
Adjusting module 605, for when the judged result of described second judge module is for meeting, adjusts and uses
In the touch-control threshold value judging position of touch.
In one preferred embodiment of the invention, described natural light is the natural light that light sensation receives, institute
Stating infrared light is the infrared light that infrared receiving tube receives；
Described first detection module, the natural light received specifically for per interval T light sensation of detection
Signal intensity；Wherein, T is more than the time that described infrared receiving tube carries out single pass；To all
The signal strength detection of the infrared light that infrared receiving tube receives is once for single pass.
Described second detection module, specifically for described infrared receiving tube carries out Y scanning, detection is every
Secondary scanning mid-infrared receives the signal intensity of the infrared light that pipe receives, wherein Y >=1.
Described device can also include: divides module, for described certainly in described first judge module judgement
Before so whether the amplitude of variation of the signal intensity of light exceedes default amplitude threshold, will according to presetting rule
The signal intensity of natural light is divided into M interval, wherein M >=1；
Described first judge module can include following submodule:
First judges submodule, for judging the signal intensity of this natural light detected and front one-time detection
The signal intensity of natural light whether be positioned at same interval；
First determines submodule, same as being not at for judging the judged result of submodule described first
Time in one interval, determine that the amplitude of variation of the signal intensity of described natural light exceedes default amplitude threshold
Value；When described first judges the judged result of submodule as being positioned at same interval, determine described from
So the amplitude of variation of the signal intensity of light is not above the amplitude threshold preset.
Described second judge module can include following submodule:
Calculating sub module, for calculating the average of the signal intensity of the infrared light detected in described Y scanning
Value；
Second judges submodule, for judge described meansigma methods whether be positioned at default threshold interval [α V,
β V] in, wherein 1 ＜ α ＜ β, V are described for judging the touch-control threshold value of position of touch；
Second determines submodule, for judging that the judged result of submodule is as being not at described second
When [α V, β V] is interior, determine that the signal intensity of described infrared light meets regularization condition.
Described adjusting module can include following submodule:
Reduce submodule, for when described meansigma methods is less than α V, reducing described touch-control threshold value V, directly
To described meansigma methods more than or equal to α V；
Increase submodule, for when described meansigma methods is more than β V, increasing described touch-control threshold value V, directly
To described meansigma methods less than or equal to β V.
The embodiment of the present invention can the signal intensity of natural light to external world detect, and judge described from
So whether the amplitude of variation of the signal intensity of light exceedes default amplitude threshold, if it does, then can examine
Survey the signal intensity of infrared light, and judge whether the signal intensity of described infrared light meets regularization condition,
When meeting regularization condition, then adjust the touch-control threshold value for judging position of touch.Due to natural according to the external world
Touch-control threshold value is adjusted by the amplitude of variation of light, therefore when Natural light intensity degree generation acute variation, and can
To adjust touch-control threshold value in time so that it is adapt to the position of touch under current Natural light intensity degree and judge, according to tune
The position of touch that touch-control threshold decision after whole goes out is more accurate, it is to avoid the acute variation of extraneous natural light
Position of touch is judged the interference produced.
The noise trap of the touch-control system described in the embodiment of the present invention can be applied in television set, calculating
Machine, mobile phone, digital camera etc. are supported in the equipment of touch control operation, to reduce when touch control operation by the external world
The interference that natural light produces.
For device embodiment, due to itself and embodiment of the method basic simlarity, so the comparison described
Simply, relevant part sees the part of embodiment of the method and illustrates.
Each embodiment in this specification all uses the mode gone forward one by one to describe, and each embodiment stresses
Be all the difference with other embodiments, between each embodiment, identical similar part sees mutually
?.
The present invention can described in the general context of computer executable instructions,
Such as program module.Usually, program module includes performing particular task or realizing specific abstract data class
The routine of type, program, object, assembly, data structure etc..Can also be in a distributed computing environment
Put into practice the present invention, in these distributed computing environment, by by communication network connected remotely
Reason equipment performs task.In a distributed computing environment, program module may be located at and includes storage device
In interior local and remote computer-readable storage medium.
Finally, in addition it is also necessary to explanation, in this article, the relational terms of such as first and second or the like
It is used merely to separate an entity or operation with another entity or operating space, and not necessarily requires
Or imply relation or the order that there is any this reality between these entities or operation.And, art
Language " includes ", " comprising " or its any other variant are intended to comprising of nonexcludability, so that
Must include that the process of a series of key element, method, commodity or equipment not only include those key elements, but also
Including other key elements being not expressly set out, or also include for this process, method, commodity or
The key element that equipment is intrinsic.In the case of there is no more restriction, statement " including ... " limit
Fixed key element, it is not excluded that there is also in including the process of described key element, method, commodity or equipment
Other identical element.
Anti-interference method and device to a kind of touch-control system provided by the present invention above, has been carried out in detail
Introducing, principle and the embodiment of the present invention are set forth by specific case used herein, above
The explanation of embodiment is only intended to help to understand method and the core concept thereof of the present invention；Simultaneously for this
The those skilled in the art in field, according to the thought of the present invention, the most all
Will change, in sum, this specification content should not be construed as limitation of the present invention.
Claims (7)
1. the anti-interference method of a touch-control system, it is characterised in that including:
The signal intensity of detection nature light；
Judge whether the amplitude of variation of the signal intensity of described natural light exceedes default amplitude threshold；
If exceeding, then detect the signal intensity of infrared light；
Judge whether the signal intensity of described infrared light meets regularization condition；
If meeting, then adjust the touch-control threshold value for judging position of touch；
Wherein, the step of the signal intensity of described detection nature light includes:
The signal intensity of the natural light that per interval T light sensation of detection receives；Wherein, T is more than right
Infrared receiving tube carries out the time of single pass；
Signal strength detection to the infrared light that all infrared receiving tubes receive is once single pass；
The step of the signal intensity of described detection infrared light includes:
Described infrared receiving tube carries out Y scanning, and detection scanning mid-infrared every time receives what pipe received
The signal intensity of infrared light, wherein Y >=1；
The step whether described signal intensity judging described infrared light meets regularization condition includes:
Calculate the meansigma methods of the signal intensity of the infrared light of detection in described Y scanning；
Judge whether described meansigma methods is positioned in default threshold interval [α V, β V], wherein 1 ＜ α ＜ β,
V is described for judging the touch-control threshold value of position of touch；
If in being not at [α V, β V], it is determined that the signal intensity of described infrared light meets regularization condition.
Method the most according to claim 1, it is characterised in that
Amplitude of variation at the signal intensity judging described natural light whether exceed default amplitude threshold it
Before, also include:
According to presetting rule, the signal intensity of natural light is divided into M interval, wherein M >=1；
Whether the amplitude of variation of the described signal intensity judging described natural light exceedes default amplitude threshold
Step include:
Judge the signal intensity of the signal intensity of this natural light detected and the natural light of front one-time detection
Whether it is positioned at same interval；
If being not in same interval, it is determined that the amplitude of variation of the signal intensity of described natural light surpasses
Cross the amplitude threshold preset；
If being positioned at same interval, it is determined that the amplitude of variation of the signal intensity of described natural light does not surpass
Cross the amplitude threshold preset.
Method the most according to claim 1, it is characterised in that described adjustment is used for judging touch-control
The step of the touch-control threshold value of position includes:
If described meansigma methods is less than α V, then reduce described touch-control threshold value V, until described meansigma methods is more than
Or equal to α V；
If described meansigma methods is more than β V, then increase described touch-control threshold value V, until described meansigma methods is less than
Or equal to β V.
Method the most according to claim 1, it is characterised in that strong at the signal of detection nature light
Before degree, also include:
Described infrared receiving tube is carried out normal scan, the letter of the infrared light that detection infrared receiving tube receives
Number intensity；
Determine tactile according to signal intensity and the described touch-control threshold value of the infrared light of detection in described normal scan
Control position；
The step bag of the meansigma methods of the signal intensity of the infrared light of detection in described Y the scanning of described calculating
Include:
Determine that corresponding infrared of the position of touch that determines in the previous subnormal scanning of described Y scanning connects
Closed tube；
Described position of touch is deleted corresponding from the signal intensity of the infrared light of described Y Scanning Detction
The signal intensity of the infrared light that infrared receiving tube receives；
Calculating the meansigma methods of the signal intensity of remaining infrared light, result of calculation is to examine in described Y scanning
The meansigma methods of the signal intensity of the infrared light surveyed.
5. the noise trap of a touch-control system, it is characterised in that including:
First detection module, for detecting the signal intensity of nature light；
First judge module, for judging whether the amplitude of variation of the signal intensity of described natural light exceedes pre-
If amplitude threshold；
Second detection module, for when the judged result of described first judge module is for exceeding, detects red
The signal intensity of outer light；Second judge module, for judging whether the signal intensity of described infrared light meets
Regularization condition；Adjusting module, for when the judged result of described second judge module is for meeting, adjusts
For judging the touch-control threshold value of position of touch；
Wherein, described first detection module, receive specifically for per interval T light sensation of detection
The signal intensity of natural light；Wherein, T is more than the time that infrared receiving tube carries out single pass；
Signal strength detection to the infrared light that all infrared receiving tubes receive is once single pass；
Described second detection module, specifically for described infrared receiving tube carries out Y scanning, detection is every
Secondary scanning mid-infrared receives the signal intensity of the infrared light that pipe receives, wherein Y >=1；
Described second judge module includes:
Calculating sub module, for calculating the average of the signal intensity of the infrared light detected in described Y scanning
Value；
Second judges submodule, for judge described meansigma methods whether be positioned at default threshold interval [α V,
β V] in, wherein 1 ＜ α ＜ β, V are described for judging the touch-control threshold value of position of touch；
Second determines submodule, for judging that the judged result of submodule is as being not at described second
When [α V, β V] is interior, determine that the signal intensity of described infrared light meets regularization condition.
Device the most according to claim 5, it is characterised in that described device also includes:
Divide module, for judging the change of the signal intensity of described natural light at described first judge module
Before whether amplitude exceedes default amplitude threshold, according to presetting rule, the signal intensity of natural light is divided
Interval for M, wherein M >=1；
Described first judge module includes:
First judges submodule, for judging the signal intensity of this natural light detected and front one-time detection
The signal intensity of natural light whether be positioned at same interval；
First determines submodule, same as being not at for judging the judged result of submodule described first
Time in one interval, determine that the amplitude of variation of the signal intensity of described natural light exceedes default amplitude threshold
Value；When described first judges the judged result of submodule as being positioned at same interval, determine described from
So the amplitude of variation of the signal intensity of light is not above the amplitude threshold preset.
Device the most according to claim 5, it is characterised in that described adjusting module includes:
Reduce submodule, for when described meansigma methods is less than α V, reducing described touch-control threshold value V, directly
To described meansigma methods more than or equal to α V；
Increase submodule, for when described meansigma methods is more than β V, increasing described touch-control threshold value V, directly
To described meansigma methods less than or equal to β V.
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| CN104049813B (en) * | 2014-06-18 | 2017-07-18 | 青岛海信电器股份有限公司 | A kind of processing method and processing device of interference signal |
| CN106328097A (en) * | 2016-09-19 | 2017-01-11 | 歌尔科技有限公司 | Display brightness control method, display brightness control device, and electronic equipment |
| CN110825270A (en) * | 2019-09-17 | 2020-02-21 | 深圳市凯健奥达科技有限公司 | Natural highlight resistant device of infrared touch screen |
| CN110597076A (en) * | 2019-09-24 | 2019-12-20 | 广东美的厨房电器制造有限公司 | Trigger device, control method, control device and household appliance |
| CN111338508B (en) * | 2020-02-20 | 2023-02-28 | Oppo（重庆）智能科技有限公司 | Touch screen point reporting method, terminal and storage medium |
| CN111942028B (en) * | 2020-06-30 | 2022-07-12 | 厦门汉印电子技术有限公司 | Thermal printer, method and device for detecting external light source interference and storage medium |
| US11764894B2 (en) * | 2021-08-26 | 2023-09-19 | Qualcomm Incorporated | Unstable jamming signal detection |
| CN114120865B (en) * | 2021-12-03 | 2023-12-01 | 江西建邦科技有限公司 | Modularized steel bar truss convenient to combine and disassemble |
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| CN102637096A (en) * | 2011-12-16 | 2012-08-15 | 友达光电股份有限公司 | Light sensing device and adjusting method thereof |
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| US20100001978A1 (en) * | 2008-07-02 | 2010-01-07 | Stephen Brian Lynch | Ambient light interference reduction for optical input devices |
| CN105786268B (en) * | 2010-02-19 | 2019-03-12 | 株式会社半导体能源研究所 | Show equipment and its driving method |
| CN102622139B (en) * | 2012-03-06 | 2015-03-25 | 中国电子科技集团公司第五十五研究所 | Strong sunshine interference-resisting method for infrared touch screen |
| CN102902424B (en) * | 2012-10-23 | 2015-10-07 | 广东威创视讯科技股份有限公司 | A kind of method improving the interference of infrared touch panel environment resistant light |
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| CN102103440A (en) * | 2009-12-16 | 2011-06-22 | 北京汇冠新技术股份有限公司 | Infrared touch screen |
| CN102637096A (en) * | 2011-12-16 | 2012-08-15 | 友达光电股份有限公司 | Light sensing device and adjusting method thereof |
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