CN104216570B - Method for improving touch accuracy of infrared touch screen - Google Patents
Method for improving touch accuracy of infrared touch screen Download PDFInfo
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- CN104216570B CN104216570B CN201310205870.8A CN201310205870A CN104216570B CN 104216570 B CN104216570 B CN 104216570B CN 201310205870 A CN201310205870 A CN 201310205870A CN 104216570 B CN104216570 B CN 104216570B
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Abstract
The invention relates to a method for improving touch accuracy of an infrared touch screen. The method includes the steps that a control system sets the signal amplitude value and the signal threshold value according to the signal amplitude values Am received by infrared receiving tubes when the signal amplitude value received by each infrared receiving tube is unchanged and the touch screen is in the touch-free state within a preset time T, and meanwhile, the touch states of a touch object are divided into the first-time touch state, the sliding touch state, the clicking state and the dead point state; the control system switches the signal amplitude value and the signal threshold value according to the signal amplitude values Am in the touch-free state and the previous touch states. The method for improving touch accuracy of the infrared touch screen is combined with the performance and the work environment of the infrared touch screen, the problems that touch accuracy is low and even touch operation fails due to the fact that the constant signal amplitude value and the constant signal threshold value are adopted in different work environments and different touch states in the prior art are effectively solved, and use experience of a user is greatly improved.
Description
Technical field
The present invention relates to infrared touch panel control technology field, specifically a kind of to improve the side that infrared touch panel touches precision
Method.
Background technology
Generally, as shown in figure 1, infrared touch panel includes a circuit board housing 2 and is arranged on circuit board housing 2
Circuit board and infrared receiving/transmission element.Circuit board housing 2 and touch panel are arranged on before display 5, and circuit board housing 2 is prominent
For touch panel, infrared receiving/transmission element of arranging on the four edges of circuit board housing 2, infrared receiving/transmission element includes infrared emission
Pipe 4 and infrared receiving tube 1, generally infrared transmitting tube 4 and infrared receiving tube 1 be arranged on relative two sides of frame,
So as to form the infrared matrix of intersection.
When actually used, the control system of infrared touch panel gates one by one infrared transmitting tube and corresponding one or many
Individual infrared receiving tube so that the light of an infrared transmitting tube transmitting is received by corresponding one or more infrared receiving tubes, shape
Into infrared ray grid lattice.When touching object such as finger etc. enters light grid lattice, some light paths are blocked, cause that part is infrared to be connect
The intensity of the light that closed tube is received is affected.In order to ensure the sensitivity of touch screen, in the control system of touch screen in advance
A signal amplitude threshold value is stored, when control system detects the signal amplitude that infrared receiving tube receives signal amplitude threshold value is less than
When think that light path is blocked, according to being blocked optical path information, by such as polyline intersection method, node statistical approach, image method etc., judge
Go out particular location of the touching object in touch panel.
In theory, signal amplitude threshold value is bigger, and the reaction of touch screen is sensitiveer.But because circuit board has certain height
Degree so that infrared transmitting tube and infrared receiving tube are positioned above at touch panel, therefore infrared transmitting tube and infrared receiving tube
There is certain distance between touch panel.Meanwhile, infrared transmitting tube also has certain height with infrared receiving tube itself, as usual
Infrared transmitting tube is highly 1.6 millimeters with infrared receiving tube, therefore the light path between infrared transmitting tube and infrared receiving tube
Also there is a certain distance between circuit board.Two factors of summary, light grid lattice place plane is located with touch panel
There is certain distance, touch objects just come into light net in dropping process, when also not in contact with to touch panel between plane
The region of grid, meeting blocking part light path, when the signal amplitude degree that infrared receiving tube is received is less than signal width set in advance
During value threshold value, control system judges that corresponding light path is blocked and will think that touch objects have touched touch panel, so as to make
Into mistaken touch.And touch objects are during the touch panel, the light path of blocking easily causes knowledge among being continually changing
Other position deviation, affects to touch precision, such as when finger is touched, finger tip can be introduced into light net grid region, next to that finger belly, so
After be whole finger, and the light path quantity of finger belly blocking will be more than finger tip, therefore the light path for blocking in this course can occur
Change, may carry out deviation to identification band of position.
And, existing infrared touch panel adopts larger signal amplitude threshold value, may go out in the case of hot and humid
The problem for now breaking.So-called broken string is referred to：In the event of high temperatures output declines infrared transmitting tube, the infrared light of transmitting
Weakened, even if the signal amplitude degree received without touch objects infrared receiving tube also can be very low, if less than the letter of setting
During number amplitude thresholds, control system can still regard as light path and be blocked；There are the feelings of water vapour in light net grid region in addition
Under condition, due to the reflection and refraction of water vapour, the signal amplitude degree that infrared receiving tube is received also can decline, if less than setting
Signal amplitude threshold value when, control system can still regard as light path and be blocked；If situation that above-mentioned light path is blocked is long
Between exist, control system will be considered that this light path is non-existent, therefore can reject this light path in follow-up scanning process
Fall, no longer scan the infrared receiving tube.Therefore, in order to the situation for preventing mistaken touch and broken string occurs, signal amplitude can be reduced
Threshold value, but this cannot just ensure the sensitivity of infrared touch panel.
Also have in prior art and mistaken touch is solved the problems, such as using highly less infrared transmitting tube and infrared receiving tube
Scheme.For example with infrared transmitting tube and infrared receiving tube that height is 1.0 millimeters or 0.8 millimeter, can relatively reduced smooth grid
The distance between lattice and touch panel place plane, but cost can greatly improve, technological requirement is also high, therefore the program and without
Ji is practical.
The content of the invention
The technical problem to be solved is infrared touch panel of the prior art using fixed signal amplitude threshold
Value, easily causes the problem of mistaken touch or broken string if signal amplitude threshold value is larger, if signal amplitude threshold value is less, meeting
The sensitivity of touch screen is reduced, can guarantee that the raising of sensitivity of touch screen is red again simultaneously so as to provide a kind of mistaken touch that do not easily cause
The method that outer touch screen touches precision.
To solve above-mentioned technical problem, the present invention is achieved by the following technical solutions：
It is a kind of to improve the method that infrared touch panel touches precision：Control system connects according to infrared receiving tube during no touch state
The signal amplitude A for receivingmSignal amplitude threshold value is set, and the signal amplitude threshold value is used to determine whether that touch point is present.
The control system determines that the process of the no touch state is as follows：
The control system gathers the signal amplitude A that each infrared receiving tube is receivedm；
In scheduled time T, the signal amplitude A that each infrared receiving tube is receivedmIt is constant, it is determined that described pre-
Fix time in T, infrared touch panel is in no touch state, wherein T >=3 second.
Described improves the method that infrared touch panel touches precision, and touch condition is divided into：Touch first, slide and touch
Touch, click on and dead point；The control system is according to signal amplitude A during no touch statemAnd touch condition arranges signal width
Value threshold value.
In the no touch state when, the signal amplitude threshold value of the control system is set to first threshold Ath1=
0.3Am, the signal amplitude that the infrared receiving tube is received is less than first threshold Ath1When be identified as with the presence of touch point,
Then touch condition switches to the touch condition first；
Into after the touch condition first, signal amplitude threshold value is set to Second Threshold A by the control systemth2=
0.5AmWith the 3rd threshold value Ath3=0.8Am；
The signal amplitude that the infrared receiving tube is received is less than the Second Threshold Ath2And while meet following two
Part：The position of the interior presence for all detecting touch point of continuous K scan period and the touch point detected in K scan period is equal
Differ, then touch condition switches to the slip touch condition；
The signal amplitude that the infrared receiving tube is received is less than the Second Threshold Ath2And in the first preset time T1It is interior
At least two scan periods are all detected with the presence of touch point, then touch condition switches to the click state；
The signal amplitude that the infrared receiving tube is received is more than the 3rd threshold value Ath3, then touch condition switch to institute
State no touch state；
Into after click state, the signal amplitude threshold value is set to the 3rd threshold value A by the control systemth3；
The signal amplitude that the infrared receiving tube is received is more than the 3rd threshold value Ath3And in the second preset time T2It is interior
All scan periods be all not detected by touch point, then touch condition switches to the no touch state；
The touch point for all detecting the presence of touch point and detecting in K scan period in the continuous K scan period
Position differs, then touch condition switches to the slip touch condition；
During presence when all detecting touch point information in continuous N number of scan period, then switched by the click state
To the dead point state；Wherein, N is integer, and N >=200；
Into after slip touch condition, the signal amplitude threshold value is set to the 4th threshold value A by the control systemth4=
0.7Am；
Within the time period less than the scheduled time T, detect the persistent period with the presence of touch point scans less than K
During the cycle, then touch condition switches to the click state, and wherein K is integer and K >=3；
If all detect with the presence of touch point within M continuous scan period, and the position of touch point is constant, then by institute
State slip touch condition and switch to dead point state；Wherein, M is integer, and M >=200；
Into after the dead point state, the signal amplitude threshold value is set to the 3rd threshold value by the control system
Ath3；
The signal amplitude that the infrared receiving tube is received within the continuous G scan period is all higher than the 3rd threshold value
Ath3, then touch condition switch to no touch state, wherein G is integer and G >=200.
First preset time T1For 1 second.
Second preset time T2For 3 seconds.
N=M=G=200。
K=3；The T=5 seconds.
The above-mentioned technical proposal of the present invention has compared to existing technology advantages below：
（1）It is of the present invention to improve the method that infrared touch panel touches precision, when control system is according to no touch state
The signal amplitude that infrared receiving tube is received arranges signal amplitude threshold value, when the working environment or working condition of infrared touch panel
The optical signal amplitude that changing causes infrared transmitting tube to send decreases, and infrared receiving tube receives relatively low signal amplitude
When, will not also judge light path by accident and be blocked, while it also avoid the appearance of broken string situation, effectively increase the touch of infrared touch panel
Precision.
（2）It is of the present invention to improve the method that infrared touch panel touches precision, it is determined that during no touch state by
In scheduled time T, when signal amplitude that each infrared receiving tube is received is constant in no touch state when infrared receiver
The signal amplitude A that pipe is receivedmArrange signal amplitude threshold value, the present invention will improve infrared touch panel touch precision method with it is red
Outer touch screen performance and working environment combine, and effectively prevent in prior art due to being existed using constant signal amplitude threshold value
Touch that precision is high or even problem of failure under different working environment and different touch conditions.
（3）It is of the present invention to improve the method that infrared touch panel touches precision, the touch condition of touch objects is divided into：
Touch first, sliding touchs, clicks on and dead point；The control system is according to signal amplitude A during no touch statemAnd it is above-mentioned
The switching signal amplitude thresholds of touch condition, above-mentioned four kinds of touch conditions can switch under certain condition, because different are touched
Touch action amplitude difference under state is touched, touch effect is also different, and touch objects are also different to light circumstance of occlusion, by different
Different threshold values are set under touch condition, be effectively prevent using unified signal amplitude threshold value, under different touch conditions
The problem for preferably touching effect can not be reached, the use feeling of user is substantially increased.
Description of the drawings
In order that present disclosure is more likely to be clearly understood, below in conjunction with the accompanying drawings, the present invention is made further in detail
Thin explanation, wherein,
Fig. 1 is the structural representation of infrared touch panel of the present invention；
Fig. 2 be it is of the present invention raising infrared touch panel touch precision method four kinds of touch conditions under certain condition
Switching schematic diagram.
Reference is expressed as in figure：1- infrared receiving tubes, 2- circuit board housings, 3- infrared light paths, 4- infrared transmitting tubes,
5- display.
Specific embodiment
Embodiment 1
In the present embodiment, the signal amplitude A that control system is received according to infrared receiving tube during no touch statemLetter is set
Number amplitude thresholds, the signal amplitude threshold value is used to determine whether that touch point is present.Wherein, it is infrared during the no touch state
The signal amplitude A that reception pipe is receivedmShow light path not by believing that infrared receiving tube in the case of any blocking can be received
Number amplitude, arranges signal amplitude threshold value for using fixed signal amplitude threshold value, its energy according to this signal amplitude
Situation about breaking enough is avoided, the touch precision of infrared touch panel is effectively improved.
Determine the signal amplitude threshold value, first have to determine the signal amplitude A during no touch statem, this method
Can flexibly be selected according to practical situation, control system described in the present embodiment determines that the process of the no touch state is as follows：
The control system gathers the signal amplitude A that each infrared receiving tube is receivedm；
In scheduled time T, the signal amplitude A that each infrared receiving tube is receivedmIt is constant, it is determined that described pre-
Fix time in T, infrared touch panel is in no touch state.
Scheduled time T >=3 second, are because generally, when operating infrared touch panel, complete once to appoint
The most fast time of business is relevant with the reaction waiting time of user all in the several seconds, is typically based on size and the scanning of touch screen
The duration in cycle selecting the size of the scheduled time T, when ATM or automatic machine is applied to, the T=5 seconds, user's
Use feeling is preferable.
Embodiment 2
The present embodiment is further to be divided into touch condition on the basis of above-described embodiment 1：Touch first, slide and touch
Touch, click on and dead point；The control system is according to signal amplitude A during no touch statemAnd the setting of above-mentioned touch condition
Signal amplitude threshold value.
As shown in Fig. 2 the present embodiment provides above-mentioned four kinds of touch conditions, and under certain condition switching mode is as follows：
Originally, when touch condition is the no touch state, the signal amplitude threshold value of the control system is set to
First threshold Ath1=0.3Am, when the signal amplitude that the infrared receiving tube is received is less than first threshold Ath1When be identified as
With the presence of touch point, then touch condition switches to the touch condition first.
Into after the touch condition first, signal amplitude threshold value is set to Second Threshold A by the control systemth2=
0.5AmWith the 3rd threshold value Ath3=0.8Am；The signal amplitude that the infrared receiving tube is received is less than the Second Threshold Ath2And it is same
When meet following two conditions：There are the presence for detecting touch point and inspection in K scan period in the continuous K scan period
The position of the touch objects for measuring differs, then switch to the slip touch condition by the touch condition first；It is described red
The signal amplitude that outer reception pipe is received is less than the Second Threshold Ath2And in the first preset time T1Inside at least two scanning
Cycle is all detected with the presence of touch point, then switch to the click state by the touch condition first, wherein described first
Preset time T1For 1 second；The signal amplitude that the infrared receiving tube is received is more than the 3rd threshold value Ath3, then by the head
Secondary touch condition switches to the no touch state.
Into after click state, the signal amplitude threshold value is set to the 3rd threshold value A by the control systemth3；Institute
State the signal amplitude that infrared receiving tube receives and be more than the 3rd threshold value Ath3And in the second preset time T2Interior all scannings
Cycle is all not detected by touch point, then switch to the no touch state by the click state, wherein described second is default
Time T2For 3 seconds；The touch for all detecting the presence of touch point and detecting in K scan period in the continuous K scan period
The position of point differs, then touch condition switches to the slip touch condition；All detect in continuous N number of scan period
During presence during the information of touch point, then the dead point state is switched to by the click state；Wherein, N is integer, and N >=
200。
Into after slip touch condition, the signal amplitude threshold value is set to the 4th threshold value A by the control systemth4=
0.7Am；Within the time period less than the scheduled time T, detect all less than K scanning with the presence of the persistent period of touch point
During the phase, then touch condition switches to the click state, and wherein K is integer and K >=3；If within M continuous scan period all
Detect with the presence of touch point, and the position of touch point is constant, then switch to dead point state by the slip touch condition；Its
In, M is integer, and M >=200.
Into after the dead point state, the signal amplitude threshold value is set to the 3rd threshold value by the control system
Ath3；The signal amplitude that the infrared receiving tube is received within the continuous G scan period is all higher than the 3rd threshold value, then
Into no touch state；Wherein, G is integer, and G >=200.
In the present embodiment N=M=G=200, T=3 seconds, in other embodiments, described N, M, G can take 250,300 etc. no
Same value, T can take 4 seconds, 6 seconds, the different value such as 7 seconds.
The value of the scheduled time T is mainly relevant with the response time of user, generally, is using touch screen
When, the response time of user is in or so several seconds.It is thereby possible to select the scheduled time is more than 3 seconds, the reaction with user
Waiting time is relevant, and specific value can be selected according to practical situation.The value of described N, M and G is carried out also according to practical situation
Select, it is mainly associated with the scan period, when ATM or automatic machine is applied to, N=M=G=200, the use of user
Impression is preferable.
Obviously, above-described embodiment is only intended to clearly illustrate example, and not to the restriction of embodiment.It is right
For those of ordinary skill in the art, can also make on the basis of the above description other multi-forms change or
Change.There is no need to be exhaustive to all of embodiment.And the obvious change thus extended out or
Among changing still in the protection domain of the invention.
Claims (4)
- It is 1. a kind of to improve the method that infrared touch panel touches precision, it is characterised in that：Control system is according to red during no touch state The signal amplitude A that outer reception pipe is receivedmSignal amplitude threshold value is set, and the signal amplitude threshold value is used to determine whether to touch Point is present；The control system determines that the process of the no touch state is as follows：The control system gathers the signal amplitude A that each infrared receiving tube is receivedm；In scheduled time T, the signal amplitude A that each infrared receiving tube is receivedmIt is constant, it is determined that in the pre- timing Between in T, infrared touch panel is in no touch state, wherein T >=3 second；Touch condition is divided into：Touch first, sliding touchs, clicks on and dead point；The control system is according to no touch state When signal amplitude AmAnd touch condition arranges signal amplitude threshold value；In the no touch state when, the signal amplitude threshold value of the control system is set to first threshold Ath1= 0.3Am, it is identified as with the presence of touch point when the signal amplitude that the infrared receiving tube is received is less than first threshold Ath1, Then touch condition switches to the touch condition first；Into after the touch condition first, signal amplitude threshold value is set to Second Threshold A by the control systemth2=0.5Am With the 3rd threshold value Ath3=0.8Am；The signal amplitude that the infrared receiving tube is received is less than the Second Threshold Ath2And while meet following two conditions： The position of the interior presence for all detecting touch point of continuous K scan period and the touch point detected in K scan period is not Identical, then touch condition switches to the slip touch condition；The signal amplitude that the infrared receiving tube is received is less than the Second Threshold Ath2And in the first preset time T1Inside at least Touch point is all detected with the presence of two scan periods, then touch condition switches to the click state；The signal amplitude that the infrared receiving tube is received is more than the 3rd threshold value Ath3, then touch condition switch to the nothing Touch condition；Into after click state, the signal amplitude threshold value is set to the 3rd threshold value A by the control systemth3；The signal amplitude that the infrared receiving tube is received is more than the 3rd threshold value Ath3And in the second preset time T2Interior institute There is the scan period to be all not detected by touch point, then touch condition switches to the no touch state；The presence of touch point and the position of the touch point detected in K scan period are all detected in the continuous K scan period Differ, then touch condition switches to the slip touch condition；During presence when all detecting touch point information in continuous N number of scan period, then institute is switched to by the click state State dead point state；Wherein, N is integer, and N >=200；Into after slip touch condition, the control system is by the signal width Value threshold value is set to the 4th threshold value Ath4=0.7Am；Within the time period less than the scheduled time T, the persistent period with the presence of touch point is detected less than K scan period When, then touch condition switches to the click state, and wherein K is integer and K >=3；If all detect with the presence of touch point within M continuous scan period, and the position of touch point is constant, then by the cunning Dynamic touch condition switches to dead point state；Wherein, M is integer, and M >=200；Into after the dead point state, the control system The signal amplitude threshold value is set to the 3rd threshold value A by systemth3；The signal amplitude that the infrared receiving tube is received within the continuous G scan period is all higher than the 3rd threshold value Ath3, Then touch condition switches to no touch state, and wherein G is integer and G >=200.
- It is 2. according to claim 1 to improve the method that infrared touch panel touches precision, it is characterised in that：Described first presets Time T1For 1 second.
- It is 3. according to claim 1 and 2 to improve the method that infrared touch panel touches precision, it is characterised in that：Described second Preset time T2For 3 seconds.
- It is 4. according to claim 1 to improve the method that infrared touch panel touches precision, it is characterised in that：N=M=G= 200。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310205870.8A CN104216570B (en) | 2013-05-29 | 2013-05-29 | Method for improving touch accuracy of infrared touch screen |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310205870.8A CN104216570B (en) | 2013-05-29 | 2013-05-29 | Method for improving touch accuracy of infrared touch screen |
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| CN104216570A CN104216570A (en) | 2014-12-17 |
| CN104216570B true CN104216570B (en) | 2017-04-26 |
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| US3775560A (en) * | 1972-02-28 | 1973-11-27 | Univ Illinois | Infrared light beam x-y position encoder for display devices |
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| CN102147684A (en) * | 2010-11-30 | 2011-08-10 | 广东威创视讯科技股份有限公司 | Screen scanning method for touch screen and system thereof |
| CN102902424A (en) * | 2012-10-23 | 2013-01-30 | 广东威创视讯科技股份有限公司 | Method for improving ambient light interference resistance of infrared touch panel |
| CN103064563A (en) * | 2012-12-28 | 2013-04-24 | 北京汇冠触摸技术有限公司 | Signal processing and control method and signal processing and control device of infrared touch screen |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012053684A (en) * | 2010-09-01 | 2012-03-15 | Toshiba Tec Corp | Display input device and display input method |
-
2013
- 2013-05-29 CN CN201310205870.8A patent/CN104216570B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3775560A (en) * | 1972-02-28 | 1973-11-27 | Univ Illinois | Infrared light beam x-y position encoder for display devices |
| WO2009136522A1 (en) * | 2008-05-09 | 2009-11-12 | 株式会社セガ | Position input device, position input method, and position input program |
| CN102147684A (en) * | 2010-11-30 | 2011-08-10 | 广东威创视讯科技股份有限公司 | Screen scanning method for touch screen and system thereof |
| CN102902424A (en) * | 2012-10-23 | 2013-01-30 | 广东威创视讯科技股份有限公司 | Method for improving ambient light interference resistance of infrared touch panel |
| CN103064563A (en) * | 2012-12-28 | 2013-04-24 | 北京汇冠触摸技术有限公司 | Signal processing and control method and signal processing and control device of infrared touch screen |
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