CN102375644B - Display device and touch induction device - Google Patents
Display device and touch induction device Download PDFInfo
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- CN102375644B CN102375644B CN201010266081.1A CN201010266081A CN102375644B CN 102375644 B CN102375644 B CN 102375644B CN 201010266081 A CN201010266081 A CN 201010266081A CN 102375644 B CN102375644 B CN 102375644B
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Abstract
A kind of display device and touch induction device.Described touch induction device comprises: drive wire, touching control, the line of induction and testing circuit, one end of described drive wire is connected with one end of described touching control, described testing circuit is connected by the other end of the described line of induction with described touching control, and described touching control is conductor.Described display device comprises described touch induction device, and described display device, touch induction device can detect single-point and touch and two touch, and structure simple, be easy to realize.For the touch-screen of support two touch, described display device cost is low, technique is simple.
Description
Technical field
The present invention relates to touch sensible technology, particularly relate to a kind of touch induction device and there is the display device of described touch induction device.
Background technology
Along with the development of science and technology, touch sensible technology is subject to more concerns and application day by day, is more and more applied in the applications such as household electrical appliances, handheld device, Industry Control, automotive electronics, military use product.Touching technique can be divided into: resistive touch technology and capacitive touch technology.The signal of capacitive touch technology detecting comes from the trace change caused because of touching.By the difference of principle of work, surface capacitance type touching technique (SCT, SurfaceCapacitiveTouch) and projected capacitive touching technique (PCT, ProjectedCapacitiveTouch) generally can be divided into again.In multiple technologies, capacitance touch induction technology has become the main flow of touch sensible technology.
At present, Touch control key, touch-control draw runner, touch-control slipping ring have started to replace traditional mechanical key and film key, and for traditional mechanical key, Touch control key, touch-control draw runner and touch-control slipping ring have larger sensitivity, stability and reliability.Simultaneously because Touch control key and touch-control draw runner make control panel have the longer life-span, it also accept by increasing user.
Fig. 1 is the schematic diagram of touch-control draw runner in prior art, and wherein 101 ~ 104 for being positioned at the touching on touch-control draw runner; Fig. 2 is the schematic diagram of touch-control slipping ring in prior art, and wherein 201 ~ 203 for being positioned at the touching on touch-control slipping ring.In practical application, touch-control draw runner/touch-control slipping ring is the action being detected finger by the principle of self-capacitance.With reference to figure 3, Fig. 3 is the circuit diagram of prior art touch induction device, wherein 301 for driving circuit, 302 be touching (being namely equivalent to any one touching in above-mentioned 101 ~ 104 or 201 ~ 203), and it can become by coupling capacitance C in equivalence when the close touching 302 of finger
fthe structure 303 of ground connection.After finger is close, be equivalent to add coupling capacitance C in 303
fsize, therefore detect coupling capacitance C by driving circuit 301
fchange, just can judge finger touched which touching actually.But said process is no problem for the detection (single-point detection) of single finger motion, but just have problem for multiple finger (multiple spot detection).For touch-control draw runner, when prior art detects touch signal, undertaken by driving circuit 301, when finger touch is to touch-control draw runner, if it has only touched certain one-touch key on draw runner, then the corresponding upper signal intensity exported of touching lead-in wire is maximum (namely coupling capacitance change is maximum).But, in practical application, finger may not only touch certain one-touch key, for Fig. 1, point likely touched touching 101,102,103 simultaneously in the process touching draw runner, at this moment it is different for pointing the area contacted with each touching, and the button area touched is larger, be coupled to the electric capacity C on it
fchange larger, the change of output signal is also larger.Therefore, the signal exported corresponding to every bar lead-in wire is not identical yet, at this moment can by analyze the upper signal intensity of lead-in wire maximum determine finger touch position is from which touching more close to, judge to point concrete touch location, thus improve the resolution of touch location.But when two fingers are pressed simultaneously, still with reference to figure 1, suppose that finger 1 has touched 101 ~ 102, finger 2 has touched 103 ~ 104, the lead signal of at this moment touching 102 may alter a great deal, the lead signal change of touching 103 simultaneously also very greatly, so just cannot judge finger is actually close to which touching more.If finger 1 has touched 101 ~ 102, finger 2 has touched 102 ~ 103, and the lead signal of now touching 102 alters a great deal, but may be judged as only having finger 1 to touch touching 102.And for multi-point gestures, such as two fingers close to each other or away from gesture just more cannot judge.If must judge that the motion of multiple finger changes as 2 gestures, then must increase the quantity of touching, do like this and extension line can be caused to increase, use very inconvenient, also can reduce the speed detecting finger touch position simultaneously.
Patent publication No. is that US20080062148 discloses a kind of single-point driving circuit, and it does not still solve the problems of the technologies described above, and is not namely suitable for multiple spot and detects, the detection of particularly 2 gesture changes.
Summary of the invention
The problem that the present invention solves is to provide a kind of touch induction device, display device, to be applicable to the detection of two touch.
For solving the problem, the invention provides a kind of touch induction device, comprise: drive wire, touching control, the line of induction and testing circuit, one end of described drive wire is connected with one end of described touching control, described testing circuit is connected by the other end of the described line of induction with described touching control, and described touching control is conductor.
Optionally, the touch-control of described touch induction device increases than the resistance with touching control when occurring to touch between two touch objects and increases, and the touch-control of described touch induction device reduces than the resistance with touching control when occurring to touch between two touch objects and reduces.
Optionally, described touch-control ratio is: (induction current-touch objects when touch objects touches described touching control does not touch induction current during described touching control)/touch objects does not touch induction current during described touching control.
Optionally, described touch objects is finger.
Optionally, described induction current is detected by described testing circuit or is calculated.
Optionally, the resistance of the touching control of surrounding when described two touch objects are closed up is greater than 10 kilo-ohms.
Optionally, the resistance of the touching control of surrounding when described two touch objects are closed up is greater than 40 kilo-ohms.
Optionally, described touch induction device also comprises drive source, and described drive source provides sinusoidal signal for described drive wire.
Optionally, described testing circuit is current amplification circuit, and the induced signal that the described line of induction exports is converted into detection signal; Described induced signal is current signal, and described detection signal is voltage signal.
Optionally, described touch induction device also comprises single-point driving circuit, and connects described touching control, and described single-point driving circuit is used for exporting single-point detection signal when described touching control touches by single-point.
Optionally, described touching control is touch-control draw runner.
For solving the problem, the present invention also provides a kind of display device comprising above-mentioned touch induction device.
Compared with prior art, technique scheme has the following advantages:
The touch-control of touch induction device is monotone variation than the change with touch-control resistance when touching between two touch objects, makes it can detect two touch, and structure simple, be easy to realize.
Touch induction device realizes based on mutual resistance principle, without the need to changing the structure (such as adding new touching) of touching control, and only needs two extension lines (i.e. drive wire and the line of induction), and thus structure is simple and be easy to realize.
Only need to increase single-point driving circuit, be namely applicable to single-point and 2 detections.
Have the display device of above-mentioned touch induction device, for the touch display unit of support 2 gestures, cost is low, and technique is simple.
Accompanying drawing explanation
Fig. 1 is a kind of schematic diagram of touch-control draw runner;
Fig. 2 is a kind of schematic diagram of touch-control slipping ring;
Fig. 3 is the circuit diagram of prior art touch induction device;
Fig. 4 is the schematic diagram of mutual capacitance Cleaning Principle;
Fig. 5 is the circuit diagram of the touch induction device of the specific embodiment of the invention;
Fig. 6 is the mutual resistance of the specific embodiment of the invention and the relation schematic diagram of touch-control ratio;
Fig. 7 is the structural representation of the touch induction device of the specific embodiment of the invention;
Fig. 8 is the schematic diagram of the display device of the specific embodiment of the invention.
Embodiment
In the prior art, touch-control draw runner is detected by the touch of self-capacitance principle to single-point, and it cannot detect the touch of 2 gestures.And inventor studies discovery, to prior art mutual capacitance principle basis on carry out suitable change, just when only having two extension lines, the touch-control of two fingers can be realized.
In order to the present invention can be understood better, first simply introduce the mutual capacitance principle in touching technique.
Now be described with the equivalent circuit diagram of the point of intersection of a drive wire any in mutual capacitance principle and the line of induction, as shown in Figure 4: drive wire 1 and the line of induction 2 are two working electrodes in mutual capacitance principle, therebetween be coupled a mutual capacitance 12, drive wire 1 and the line of induction 2 have stray capacitance 13 over the ground, testing circuit 6 is current amplifiers, the electric current I on the line of induction is transformed into voltage signal V and exports.When finger touch, mutual capacitance 12 changes, and so just causes the output current I of the line of induction 2 to change, thus output voltage V is changed.And then whether the point of intersection detecting drive wire and the line of induction produces touching signals.
If inventor is according to the structure of touch-control draw runner and find to change the mutual capacitance in above-mentioned principle into mutual resistance in conjunction with above-mentioned mutual capacitance principle, the detection to two touch just can be realized when not increasing lead-in wire.And for the detection that single-point touches, only need to change type of drive and just can realize.
Referring to Fig. 5, touch induction device of the present invention is described.In order to clearly the present invention is described, be that touch objects is described with finger in the present embodiment.As shown in Figure 5, Fig. 5 is the circuit diagram of the touch induction device of the specific embodiment of the invention, wherein 3 ' is drive source, 1 ' be drive wire, 2 ' be the line of induction, 6 ' be testing circuit, resistance R1 is the equivalent resistance of drive wire 1 ', resistance R6 is mutual resistance, and resistance R2 is the equivalent resistance of the line of induction 2 '; Drive wire 1 ' and the line of induction 2 ' have stray capacitance C2 over the ground and C3 respectively; Testing circuit 6 ' is a current amplifier, in order to measure the induction current I that the line of induction 2 ' exports
sense, preferably induction current I
senseby voltage signal V
outcalculate.When finger touch, point and equivalence is become a resistance-capacitance network 5, described resistance-capacitance network 5 comprises: resistance R3, R4, R5, electric capacity C4, C5, C6, and wherein: electric capacity C6 is human body electric capacity over the ground, electric capacity C4 and C5 is that finger exists the coupling capacitance produced.
In order to can clearer explanation touch induction device of the present invention, first define as follows: for touch-control ratio, (touch objects described in the present embodiment is hand to induction current when (induction current when induction current-touch objects when touch objects touches touching control does not touch touching control)/touch objects does not touch touching control, described touching control is equivalent to mutual resistance R6 in the circuit diagram of the present embodiment touch induction device), wherein, when induction current during described touch objects touch touching control refers to and is linked into the two ends of mutual resistance R6 by the resistance-capacitance network 5 of finger equivalence, the upper induction current I exported of the line of induction 2 '
sense, when induction current when described touch objects does not touch touching control refers to that the resistance-capacitance network 5 of finger equivalence is not linked into the two ends of mutual resistance R6, the upper induction current I exported of the line of induction 2 '
sense.Now getting frequency is 20 megahertzes, peak value is the driving of sine wave as drive source 3 ' of 10V, the equivalent resistance R1 of drive wire 1 ' is equal with the equivalent resistance R2 of the line of induction 2 ' is 5 ohm, drive wire 1 ' stray capacitance C2 is over the ground equal with the line of induction 2 ' stray capacitance C3 is over the ground 500 pico farads, in the resistance-capacitance network 5 formed by finger equivalence, resistance R3=R4=1 kilo-ohm, R5=1.5 kilo-ohm, the coupling capacitance C4 that finger produces and C5 is 1 pico farad, human body ground capacitance C6 is 100 pico farads, now change the resistance of mutual resistance R6, observe the induction current I that the line of induction 2 ' exports
sensealong with by finger equivalence resistance-capacitance network 5 access, do not access mutual resistance R6 two ends time induction current, touch-control ratio change.Due to the detection signal V that testing circuit 6 ' exports
outthe induction current I exported with the line of induction 2 '
sensevariation tendency is identical, therefore, is observing the induction current I of the line of induction 2 ' output
senseand also observe detection signal V while touch-control ratio
outchange.
As shown in Figure 6, in Fig. 6, horizontal ordinate is the resistance of mutual resistance R6, and unit is ohm, ordinate be touch-control than 11, it is a ratio, without unit.The size of touch-control ratio then reflects the faradic rate of change that induction current that the line of induction that causes due to finger touch exports exports relative to line of induction during non-touch, as shown in Figure 6, when the resistance of mutual resistance R6 reduces gradually from infinity, touch-control can reduce from positive dirction gradually than 11, can be known by the definition of above-mentioned touch-control ratio, when mutual resistance R6 is enough large, the induction current after finger touch, the line of induction exported is greater than induction current when finger does not touch, the line of induction exported, also be that the detection signal detected after finger touch is greater than the detection signal detected when finger does not touch, and when the resistance of mutual resistance R6 reduces gradually from infinity, the value of touch-control than 11 also can reduce gradually from positive dirction, continue can find when the resistance of mutual resistance R6 is reduced to a certain degree with reference to figure 6, touch-control can be reduced to 0 than 11, along with the further reduction of R6 resistance, touch-control also can continue than 11 to be reduced to negative, the signal detected when this is also with regard to meaning now finger touch is less than the signal detected when finger does not touch, when mutual resistance R6 continues to reduce, the absolute value of touch-control than 11 can continue to reduce, finally level off to 0.And (resistance of R6 shown in Fig. 6 is about 40 kilo-ohms) touch-control reaches minimum value than 11 when mutual resistance R6 has been reduced in certain resistance, be the maximal value of negative sense in the drawings.
As can see from Figure 6, the resistance of R6 is a separation at about 40 kilo-ohms, is dull in the value of its both sides touch-control than 11.Thus, inventor considers, if adopt material that a kind of resistivity is larger as touching control, when two refer to touch, close to each other and away from time, the circuit diagram of its equivalence is just identical with Fig. 5.So just can by the change of touch-control in Fig. 6 than 11 analyze when two fingers touch separately and the gesture of drawing close, namely corresponding can judge " Scalable " action in 2 gestures.
Based on the circuit diagram of above-mentioned touch induction device, with reference to figure 7, the embodiment of the present invention provides a kind of touch induction device, comprising: drive wire 1 ", touching control 8, the line of induction 2 " and testing circuit 6 ".The other end input sinusoidal signal of drive wire 1 " one end be electrically connected with the left end of touching control 8, drive wire 1 ", by drive source 3, " provide, drive source 3 in the present embodiment " is a current source.Testing circuit 6 " by the line of induction 2 " is electrically connected with the right-hand member of touching control 8, testing circuit 6 in the present embodiment " identical with testing circuit in Fig. 56 ', be current amplifier, therefore only illustrate with block diagram.Described touching control 8 such as, for having the touch-control draw runner of certain resistivity, metal runner in the present embodiment.
Composition graphs 5 and Fig. 7, when finger touch is to described touching control 8, the resistance R1 ' of the touching control in two finger outsides and R2 ' respectively equivalence has become R1 and R2 shown in Fig. 5, and two refer to that the resistance R6 ' of the touching control of surrounding then is equivalent to mutual resistance R6.When two fingers are drawn close mutually, the resistance being equivalent to mutual resistance R6 ' reduces, and when closing up between two fingers, (distance of two fingers can not be close again, and the distance namely between two fingers is 0, be actually the thickness sum being similar to two fingers), now R6 ' reaches minimum value.The relation schematic diagram of touch-control than 11 and between mutual resistance R6 in composition graphs 6, when adjusting to a certain value to mutual resistance R6, the touch-control ratio of its correspondence can reach minimum value, i.e. the maximal value of negative sense, then according to the variation tendency of mutual resistance resistance, the monotone variation trend of detection signal just can be reflected.Therefore, as long as when control R6 ' is for minimum value, when namely closing up between two fingers, touch-control ratio reaches minimum value, namely can detect the change of 2 gestures.When in the present embodiment, mutual resistance R6 ' reaches about 40 kilo-ohms, touch-control is than being minimum value (maximum negative value).
Therefore, according to the above analysis, when selecting the material of touching control 8, the resistance value of the touching control of surrounding when described touching control (touch-control draw runner) can be closed up by described two fingers determines.The length of the touch-control draw runner that usual two fingers surround when closing up is 0.8cm ~ 1.2cm, the length of touch-control draw runner of surrounding when closing up for two fingers in the present embodiment is described for 1cm, continue with reference to figure 6, in figure, mutual resistance R6 touch-control ratio about 40 kilo-ohms time is minimum value, if now getting resistivity is that the material of 40 kilo-ohms/centimetre does touch-control draw runner, the resistance of the touch-control draw runner that two fingers surround when closing up is then 40 kilo-ohms, therefore finger touch-control value than 11 when closing up can be made to reach the maximal value of negative sense, and when two fingers separate, the resistance of mutual resistance R6 ' increases, composition graphs 6, when mutual resistance R6 increases from 40 kilo-ohms, its touch-control is monotone increasing than 11, that is: the value of output current when (output current-finger during finger touch touch-control draw runner does not touch output current during touch-control draw runner)/finger does not touch touch-control draw runner is monotone increasing, the induced signal (being current signal in the present embodiment) that so line of induction exports also can increase thereupon, and then testing circuit 6 " detection signal (in the present embodiment for voltage signal) exported also can increase accordingly, therefore can by judging that the voltage signal that testing circuit exports is that monotonically increasing trend judges that two fingers are in separated position.In like manner, when two fingers are drawn close, the resistance of its mutual resistance R6 ' reduces, still composition graphs 6, now touch-control is monotone decreasing than 11, the value of output current when namely (output current-finger during finger touch touch-control draw runner does not touch output current during touch-control draw runner)/finger does not touch touch-control draw runner is monotone decreasing, the induced signal (being current signal in the present embodiment) that so line of induction exports also can reduce thereupon, and then the detection signal that testing circuit 6 ' exports (being voltage signal in the present embodiment) also can reduce accordingly, therefore can by judging that voltage signal that testing circuit exports is that the trend of monotone decreasing judges that two fingers are in the state of drawing close.
From the above, by detect the change of the voltage signal that testing circuit exports be whether monotone increasing or for monotone decreasing just can judge to point separately and draw close action, we just can judge " Scalable " in 2 gestures (corresponding respectively point separate and draw close) action like this.
Still with reference to figure 6, when the resistance of touch-control draw runner surrounded when two fingers close up is greater than 40 kilo-ohms (the mutual resistance R6 shown in Fig. 6), touch-control all presents monotonically increasing trend than with the value of touch-control draw runner resistance, and the resistance of the touch-control draw runner surrounded when therefore preferably described two fingers close up is greater than 40 kilo-ohms.Be described for finger touch in the present embodiment, but not as limit, touch objects can also be other article except finger, such as felt pen etc.
It should be noted that, due to the stray capacitance of touch-control draw runner self in real process, the difference of network values of finger different thus equivalence during touch and the impact etc. of ambient environmental factors all can cause corresponding touch-control than the difference of mutual resistance R6 when reaching minimum value, inventor passes through repetition test, for the drive source 3 ' in the circuit diagram shown in Fig. 5, equivalent resistance R1, R2, stray capacitance C2, C3, resistance R3, R4, R5, electric capacity C4, C5, C6 sets different values, and the length of touch objects being closed up is set smaller than the arbitrary value in 1.2cm respectively, thus draw the touch-control ratio/mutual resistance curve shown in different Fig. 6, find that the resistance of the touch-control draw runner surrounded when two touch objects are closed up also can realize the monotone increasing trend of touch-control ratio and mutual resistance better in the scope being greater than 10 kilo-ohms, thus can judge that touch objects is in and close up or separated position.
In addition, drive if the touch-control draw runner that the present embodiment provides by we connects a set of existing single-point by drive wire, driving circuit 301 as shown in Figure 3, then the touch-control draw runner that the present embodiment provides also may be used for the touch detecting single-point.
The present embodiment also provides a kind of display device comprising above-mentioned touch induction device.
As shown in Figure 8, display device 10 comprises: LCDs 101, touching control 102, touch-control slipping ring 103 and internal circuit (not shown), and LCDs 101 can be common display screen herein, and does not want Seeking Truth touch display screen.Wherein, internal circuit comprises the drive wire and the line of induction being connected touching control 102 other end that connect touching control 102 one end, the line of induction is connected with testing circuit (testing circuit 6 ' as shown in Figure 5), drive wire input sinusoidal signal, can be provided by drive source (such as current source), touching control, drive wire, the touch induction device shown in the line of induction and testing circuit composition diagram 7,2 detections can be realized, and controlled by driving circuit (not shown) display to LCDs 101.Internal circuit can also comprise single-point driving circuit, connects described touching control 102, and described single-point driving circuit exports single-point detection signal when described touching control 102 touches by single-point, realizes single-point thus and detects (such as single-point drag and drop control).In addition, the control of some rotation process can also be realized by slipping ring 103.
In addition, display device also can only comprise touch induction device and display screen, realizes 2 detections.
To sum up, the touch induction device that the embodiment of the present invention provides can realize the detection to two touch, and only needs two extension lines, and without the need to changing touching control structure or adding new touching.The display device of the embodiment of the present invention, for the display device with touch display screen of support two touch, the detection of two touch just can be realized by touching control and testing circuit, to realize carrying out convergent-divergent control to the display of display screen, therefore there is the advantages such as cost is low, technique is simple.
Although the present invention with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; the Method and Technology content of above-mentioned announcement can be utilized to make possible variation and amendment to technical solution of the present invention; therefore; every content not departing from technical solution of the present invention; the any simple modification done above embodiment according to technical spirit of the present invention, equivalent variations and modification, all belong to the protection domain of technical solution of the present invention.
Claims (10)
1. a touch induction device, it is characterized in that, comprise drive wire, touching control, the line of induction and testing circuit, one end of described drive wire is connected with one end of described touching control, described testing circuit is connected by the other end of the described line of induction with described touching control, and described touching control is conductor;
The induced signal that the described line of induction exports increases with the resistance increase of touching control when occurring to touch between two touch objects;
Induction current is detected by described testing circuit or is calculated, and described testing circuit is current amplification circuit, and the induced signal that the described line of induction exports is converted into detection signal; Described induced signal is current signal, and described detection signal is voltage signal.
2. touch induction device as claimed in claim 1, it is characterized in that, the touch-control of described touch induction device increases than the resistance with touching control when occurring to touch between two touch objects and increases, and the touch-control of described touch induction device reduces than the resistance with touching control when occurring to touch between two touch objects and reduces.
3. touch induction device as claimed in claim 2, it is characterized in that, described touch-control ratio is: (induction current-touch objects when touch objects touches described touching control does not touch induction current during described touching control)/touch objects does not touch induction current during described touching control.
4. touch induction device as claimed in claim 2, is characterized in that, described touch objects is finger.
5. touch induction device as claimed in claim 2, is characterized in that, the resistance of the touching control of surrounding when described two touch objects are closed up is greater than 10 kilo-ohms.
6. touch induction device as claimed in claim 1, is characterized in that, the resistance of the touching control of surrounding when described two touch objects are closed up is greater than 40 kilo-ohms.
7. touch induction device as claimed in claim 1, it is characterized in that, described touch induction device also comprises drive source, and described drive source provides sinusoidal signal for described drive wire.
8. touch induction device as claimed in claim 1, it is characterized in that, described touch induction device also comprises single-point driving circuit, and connects described touching control, and described single-point driving circuit is used for exporting single-point detection signal when described touching control touches by single-point.
9. touch induction device as claimed in claim 1, it is characterized in that, described touching control is touch-control draw runner.
10. one kind comprises the display device of the touch induction device described in any one of claim 1 ~ 9.
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| CN101464767A (en) * | 2007-12-19 | 2009-06-24 | 华硕电脑股份有限公司 | Touching control panel |
| CN101493744A (en) * | 2008-01-25 | 2009-07-29 | 三菱电机株式会社 | Touch panel device and user interface device |
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| CN201402456Y (en) * | 2009-04-20 | 2010-02-10 | 深圳市汇顶科技有限公司 | Capacitance-type touch panel with single-side wiring and touch screen terminal |
| CN101702110A (en) * | 2009-11-25 | 2010-05-05 | 松翰科技股份有限公司 | Method for detecting multi-touch of resistive touch pad |
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| CN101464767A (en) * | 2007-12-19 | 2009-06-24 | 华硕电脑股份有限公司 | Touching control panel |
| CN101493744A (en) * | 2008-01-25 | 2009-07-29 | 三菱电机株式会社 | Touch panel device and user interface device |
| CN101510136A (en) * | 2008-02-13 | 2009-08-19 | 株式会社和冠 | Position detecting device and position detecting method |
| CN101739188A (en) * | 2008-11-14 | 2010-06-16 | 胜华科技股份有限公司 | Multi-touch resistance-type touch panel and method for detecting multiple pointing sticks |
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