CN102375644A - Display device and touch sensing device - Google Patents
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- CN102375644A CN102375644A CN2010102660811A CN201010266081A CN102375644A CN 102375644 A CN102375644 A CN 102375644A CN 2010102660811 A CN2010102660811 A CN 2010102660811A CN 201010266081 A CN201010266081 A CN 201010266081A CN 102375644 A CN102375644 A CN 102375644A
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Abstract
A display device and a touch sensing device are provided. The touch sensing apparatus includes: drive line, touch controlling part, induction line and detection circuitry, the one end of drive line with the one end of touching the controlling part is connected, detection circuitry passes through the induction line with the other end of touching the controlling part links to each other, and it is the conductor to touch the controlling part. The display device comprises the touch sensing device, the display device and the touch sensing device can detect single-point touch and two-point touch, and the display device and the touch sensing device are simple in structure and easy to realize. Compared with a touch screen supporting two-point touch, the display device is low in cost and simple in process.
Description
Technical field
The present invention relates to the touch sensible technology, the display device that particularly relates to a kind of touch induction device and have said touch induction device.
Background technology
Along with development of science and technology, the touch sensible technology receives the more concern and application day by day, by the increasing applications such as household electrical appliances, handheld device, Industry Control, automotive electronics, military use product that are applied in.Touching technique can be divided into: resistive touch technology and capacitive touch technology.The signal of capacitive touch technology detecting comes from the trace that causes because of touching to be changed.By the difference of principle of work, can be divided into surface capacitance type touching technique (SCT, Surface Capacitive Touch) and projected capacitive touching technique (PCT, Projected Capacitive Touch) again generally.In multiple technologies, the 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 begun to replace traditional mechanical key and film key, and touch-control key, touch-control draw runner and touch-control slipping ring have bigger sensitivity, stability and reliability for traditional mechanical key.Because touch-control key and touch-control draw runner make control panel have the longer life-span, it is also accepted by more and more users simultaneously.
Fig. 1 is the synoptic diagram of touch-control draw runner in the prior art, and wherein 101～104 for being positioned at the touching on the touch-control draw runner; Fig. 2 is the synoptic diagram of touch-control slipping ring in the prior art, and wherein 201～203 for being positioned at the touching on the touch-control slipping ring.In the practical application, touch-control draw runner/touch-control slipping ring is the action that detects finger through 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 is touching (promptly being equivalent to any touching in above-mentioned 101～104 or 201～203), and it can become through coupling capacitance C in equivalence when pointing near touching 302
fThe structure 303 of ground connection.When the finger near after, be equivalent to increase coupling capacitance C in 303
fSize, therefore detect coupling capacitance C through driving circuit 301
fChange, just can judge which touching finger has touched actually.Yet said process is no problem for the detection (single-point detection) of single finger motion, but for a plurality of fingers (multiple spot detection), just has problem.With the touch-control draw runner is example; When prior art detects touch signal; Carry out through driving circuit 301; When finger touch arrived the touch-control draw runner, if it has only touched certain one-touch key on the draw runner, the signal that then corresponding touching lead-in wire is upward exported changed maximum (being that coupling capacitance changes maximum).But; Finger possibly not only touch certain one-touch key in the practical application; With Fig. 1 is example, and finger might touch touching 101,102,103 simultaneously in the process that touches draw runner, and it is different at this moment pointing the area that contacts with each touching; And the button area that touches is big more, is coupled to the capacitor C on it
fChange just big more, the change of output signal is also just big more.Therefore, also inequality corresponding to the signal of every lead-in wire output, at this moment can go up signal and change maximum confirming the finger touch position is nearer from which touching through analyzing lead-in wire, judge and point concrete touch location, thereby improved the resolution of touch location.Yet 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, and the lead signal of touching at this moment 102 possibly alter a great deal; The lead signal of touching 103 simultaneously changes also very greatly, so just can't judge that finger is nearer from which touching actually.If finger 1 has touched 101～102, finger 2 has touched 102～103, and the lead signal of touching 102 this moment alters a great deal, and only has finger 1 to touch touching 102 but may be judged as.And for multi-point gestures, for example two fingers each other near or away from gesture just more can't judge.Change like 2 gestures if must judge the motion of a plurality of fingers, then must increase the quantity of touching, do like this and can cause extension line to increase, use very inconveniently, also can reduce the speed that detects the 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 promptly is not suitable for multiple spot and detects, particularly 2 detections that gesture changes.
Summary of the invention
The problem that the present invention solves provides a kind of touch induction device, display device, to be applicable to the detection of 2 touches.
For addressing the above problem; The present invention provides a kind of touch induction device; Comprise: drive wire, touching control, the line of induction and testing circuit; One end of said drive wire is connected with an end of said touching control, and said testing circuit links to each other with the other end of said touching control through the said line of induction, and said touching control is a conductor.
Optional, the touch-control of said touch induction device increases than the resistance of the touching control between two touch objects when taking place to touch, and the touch-control of said touch induction device reduces than the resistance of the touching control between two touch objects when touch takes place and reduces.
Optional, said touch-control ratio is: the induction current when (induction current the when induction current-touch objects when touch objects touches said touching control does not touch said touching control)/touch objects does not touch said touching control.
Optional, said touch objects is finger.
Optional, said induction current detects or calculates through said testing circuit.
Optional, the resistance of the touching control of surrounding when said two touch objects are closed up is greater than 10 kilo-ohms.
Optional, the resistance of the touching control of surrounding when said two touch objects are closed up is greater than 40 kilo-ohms.
Optional, said touch induction device also comprises drive source, and said drive source is that said drive wire provides sinusoidal signal.
Optional, said testing circuit is a current amplification circuit, the induced signal that the said line of induction is exported is converted into detection signal; Said induced signal is a current signal, and said detection signal is a voltage signal.
Optional, said touch induction device also comprises the single-point driving circuit, and connects said touching control, said single-point driving circuit is used for output single-point detection signal when said touching control receives single-point touches.
Optional, said touching control is the touch-control draw runner.
For addressing the above problem, the present invention also provides a kind of display device that comprises above-mentioned touch induction device.
Compared with prior art, technique scheme has the following advantages:
The touch-control of touch induction device is than the touch-control changes in resistance between two touch objects when touching and monotone variation makes it can detect 2 touches, and simple in structure, be easy to realize.
Touch induction device is realized based on the mutual resistance principle, need not to change the structure (for example adding new touching) of touching control, and only needs two extension lines (being the drive wire and the line of induction), thereby simple in structure and be easy to realize.
Only needing increases the single-point driving circuit, promptly applicable to single-point and 2 detections.
Display device with above-mentioned touch induction device, for the touch display unit of supporting 2 gestures, cost is low, and technology is simple.
Description of drawings
Fig. 1 is a kind of synoptic diagram of touch-control draw runner;
Fig. 2 is a kind of synoptic diagram of touch-control slipping ring;
Fig. 3 is the circuit diagram of prior art touch induction device;
Fig. 4 is the synoptic diagram that mutual capacitance detects 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 synoptic diagram that concerns 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 synoptic diagram of the display device of the specific embodiment of the invention.
Embodiment
In the prior art, the touch-control draw runner is to detect through the touch of self-capacitance principle to single-point, and it can't detect the touch of 2 gestures.And the inventor discovers, to prior art the basis of mutual capacitance principle on carry out suitable change, just can be under the situation of having only two extension lines, realize two touch-controls that refer to.
In order to understand the present invention better, first brief account is the mutual capacitance principle in the touching technique once.
Existing equivalent circuit diagram with the intersection point place of any drive wire and the line of induction in the mutual capacitance principle describes; As shown in Figure 4: drive wire 1 is two working electrodes in the mutual capacitance principle with the line of induction 2; A mutual capacitance 12 has been coupled between the two; Drive wire 1 all has stray capacitance 13 over the ground with the line of induction 2, and testing circuit 6 is current amplifiers, and the electric current I on the line of induction is transformed into voltage signal V output.Mutual capacitance 12 changes when finger touch, so just causes the output current I of the line of induction 2 to change, thereby output voltage V is changed.And then whether the intersection point place of detecting the drive wire and the line of induction produces touching signals.
The inventor is according to the structure of touch-control draw runner and combine above-mentioned mutual capacitance principle to find if with the mutual resistance that changes into of the mutual capacitance in the above-mentioned principle, just can under the situation that does not increase lead-in wire, realize the detection to 2 touches.And, only need change type of drive and just can realize for the detection of single-point touches.
Describe for touch induction device of the present invention with reference to Fig. 5 below.For the present invention can clearly be described, be that touch objects describes with the 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 ' be drive source, 1 ' be drive wire, 2 ' the be line of induction, 6 ' for testing circuit, resistance R 1 be drive wire 1 ' equivalent resistance; Resistance R 6 is a mutual resistance, resistance R 2 be the line of induction 2 ' equivalent resistance; Drive wire 1 ' with the line of induction 2 ' have respectively over the ground stray capacitance C2 and C3; Testing circuit 6 ' be a current amplifier, in order to measure the induction current I of the line of induction 2 ' output
Sense, induction current I preferably
SenseThrough voltage signal V
OutCalculate.When finger touch, finger becomes a resistance-capacitance network 5 with equivalence, and said resistance-capacitance network 5 comprises: resistance R 3, and R4, R5, capacitor C 4, C5, C6, wherein: capacitor C 6 is a human body electric capacity over the ground, capacitor C 4 is that finger exists the coupling capacitance that produces with C5.
For can clearer explanation touch induction device of the present invention; Define as follows earlier: the induction current of (induction current the when induction current-touch objects when touch objects touches touching control does not touch touching control)/when touch objects does not touch touching control is that touch-control is than (touch objects described in the present embodiment is a hand; The equivalence in the circuit diagram of present embodiment touch induction device of said touching control is mutual resistance R6); Wherein, Induction current when said touch objects touches touching control is meant when the resistance-capacitance network 5 by the finger equivalence is linked into the two ends of mutual resistance R6, the line of induction 2 ' the go up induction current I of output
SenseInduction current when said touch objects does not touch touching control is meant when the resistance-capacitance network 5 of finger equivalence is not linked into the two ends of mutual resistance R6, the induction current I of the line of induction 2 ' last output
SenseThe sine wave of getting frequency at present and be 20 megahertzes, peak value and be 10V as drive source 3 ' driving; Drive wire 1 ' equivalent resistance R1 and the line of induction 2 ' equivalent resistance R2 equate to be 5 ohm, the stray capacitance C3 of the stray capacitance C2 of drive wire 1 ' over the ground and the line of induction 2 ' over the ground equates to be 500 pico farads, in the resistance-capacitance network 5 that is formed by the finger equivalence; Resistance R 3=R4=1 kilo-ohm; R5=1.5 kilo-ohm, coupling capacitance C4 and C5 that finger produces are 1 pico farad, and human body ground capacitance C6 is 100 pico farads; Change the resistance of mutual resistance R6 at present, observe the induction current I of the line of induction 2 ' output
SenseAlong with the resistance-capacitance network 5 by finger equivalence inserts, the variation of induction current, touch-control ratio when not inserting mutual resistance R6 two ends.Because the detection signal V of testing circuit 6 ' output
OutInduction current I with the line of induction 2 ' output
SenseVariation tendency is identical, therefore, and at the induction current I that observes the line of induction 2 ' output
SenseAlso observed detection signal V when reaching the touch-control ratio
OutVariation.
As shown in Figure 6, horizontal ordinate is the resistance of mutual resistance R6 among Fig. 6, unit be ohm, ordinate be touch-control than 11, it is a ratio, no unit.The size of touch-control ratio has then reflected because the faradic rate of change of the induction current of the line of induction output that finger touch causes line of induction output during with respect to touch not is as shown in Figure 6, when the resistance of mutual resistance R6 when infinity reduces gradually; Touch-control can reduce from positive dirction than 11 gradually, can be known by the definition of above-mentioned touch-control ratio, when mutual resistance R6 is enough big; The induction current of exporting on the line of induction when induction current of exporting on the line of induction behind the finger touch does not touch greater than finger; Also be behind the finger touch detected detection signal greater than finger detected detection signal when not touching, and when the resistance of mutual resistance R6 when infinity reduces gradually, touch-control also can begin to reduce gradually from positive dirction than 11 value; Continuation can be found after 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, and along with further reducing of R6 resistance, touch-control also can continue to be reduced to negative than 11; This also just means detected signal when this moment, detected signal did not touch less than finger during finger touch; When mutual resistance R6 continues to reduce, touch-control can continue to reduce than 11 absolute value, levels off to 0 at last.And (resistance of R6 shown in Fig. 6 is about 40 kilo-ohms) touch-control has reached minimum value than 11 when mutual resistance R6 has been reduced on certain resistance, is the maximal value of negative sense in the drawings.
Can see that from Fig. 6 the resistance of R6 is a separation about 40 kilo-ohms, be dull at its both sides touch-control than 11 value.Thus, the inventor considers, if adopt the bigger material of a kind of resistivity, refer to touch when two as touching control, each other near with away from the time, its equivalent circuit diagram is just identical with Fig. 5.So just can through touch-control among Fig. 6 than 11 variation analyze two when refer to touching separately and the gesture of drawing close, promptly can correspondingly judge " amplification is dwindled " action in 2 gestures.
Based on the circuit diagram of above-mentioned touch induction device, with reference to figure 7, the embodiment of the 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 " an end be electrically connected drive wire 1 with the left end of touching control 8 ", " provide, drive source 3 in the present embodiment " is a current source by drive source 3.Testing circuit 6 " through the line of induction 2 " is electrically connected with the right-hand member of touching control 8, and testing circuit 6 in the present embodiment " with testing circuit among Fig. 56 ' identical, is current amplifier, so only illustrate with block diagram.The touch-control draw runner of said in the present embodiment touching control 8 for having certain resistivity, for example metal runner.
In conjunction with Fig. 5 and Fig. 7, when finger touch during to said touching control 8, two refer to the touching control in the outside resistance R 1 ' with R2 ' respectively equivalence become R1 and the R2 shown in Fig. 5, two touching control that refer to be surrounded resistance R 6 ' then equivalence is mutual resistance R6.When two fingers are drawn close each other; The resistance that is equivalent to mutual resistance R6 ' reduces, between two fingers when closing up (distance of two fingers can not be again near, promptly the distance between two fingers is 0; Be actually the thickness sum that is similar to two fingers), this moment, R6 ' reached minimum value.In conjunction with touch-control among Fig. 6 than 11 and mutual resistance R6 between concern synoptic diagram; When mutual resistance R6 was adjusted to a certain value, its corresponding touch-control ratio can reach minimum value, i.e. the maximal value of negative sense; Then, just can reflect the monotone variation trend of detection signal according to the variation tendency of mutual resistance resistance.Therefore, as long as control R6 ' is when be minimum value, promptly two when closing up between pointing, and the touch-control ratio reaches minimum value, promptly can detect the variation of 2 gestures.When mutual resistance R6 ' reached 40 kilo-ohms of left and right sides in the present embodiment, touch-control was than being minimum value (maximum negative value).
Therefore, according to above-mentioned analysis, when selecting the material of touching control 8, the resistance value decision of the touching control that said touching control (touch-control draw runner) can be surrounded when closing up by said two fingers.The length of the touch-control draw runner that common two fingers are surrounded when closing up is 0.8cm～1.2cm; The length of the touch-control draw runner that is surrounded when closing up with two fingers in the present embodiment is that 1cm is that example describes; Continuation is with reference to figure 6; Mutual resistance R6 touch-control when 40 kilo-ohms of left and right sides is that 40 kilo-ohms/centimetre material is done the touch-control draw runner if get resistivity this moment than for minimum value among the figure, and the resistance of the touch-control draw runner that two fingers are surrounded when closing up then is 40 kilo-ohms; So can be so that finger touch-control when closing up reaches the maximal value of negative sense than 11 value; And when two fingers separated, the resistance of mutual resistance R6 ' increased, in conjunction with Fig. 6; Mutual resistance R6 is when 40 kilo-ohms increase; Its touch-control is a monotone increasing than 11, that is: the value of the output current of (output current the when output current-finger during finger touch touch-control draw runner does not touch the touch-control draw runner)/finger when not touching the touch-control draw runner is a monotone increasing, and the induced signal of line of induction output (being current signal in the present embodiment) also can increase thereupon so; " detection signal of output (being voltage signal in the present embodiment) also can increase and then testing circuit 6 accordingly, therefore can be monotonically increasing trend through the voltage signal of judging testing circuit output and judge that two fingers are in separated position.In like manner; When two fingers are drawn close; The resistance of its mutual resistance R6 ' reduces, and still combines Fig. 6, and this moment, touch-control was a monotone decreasing than 11; The value of the output current of i.e. (output current the when output current-finger during finger touch touch-control draw runner does not touch the touch-control draw runner)/finger when not touching the touch-control draw runner is a monotone decreasing; The induced signal of line of induction output (being current signal in the present embodiment) also can reduce thereupon so, and then the detection signal of testing circuit 6 ' output (being voltage signal in the present embodiment) also can reduce accordingly, and the trend that therefore can be monotone decreasing through the voltage signal of judging testing circuit output judges that two point the state of drawing close that is in.
From the above; The variation of the voltage signal through detecting testing circuit output whether be monotone increasing or for monotone decreasing just can judge finger separately and draw close action, we just can judge that " amplification is dwindled " in 2 gestures (corresponding respectively finger separate and draw close) moves like this.
Still with reference to figure 6; When the resistance of the touch-control draw runner of encirclement is greater than 40 kilo-ohms when two fingers close up (the mutual resistance R6 shown in Fig. 6); Touch-control all presents monotonically increasing trend than the value with touch-control draw runner resistance, and the resistance of the touch-control draw runner that therefore preferably said two fingers surround when closing up is greater than 40 kilo-ohms.Be that example describes with the finger touch in the present embodiment, but not as limit, touch objects can also be other article except that finger, felt pen etc. for example.
It should be noted that; Because the stray capacitance of touch-control draw runner self, the difference of the mutual resistance R6 that all can cause corresponding touch-control when reaching minimum value such as the difference of the different thereby equivalent network values of finger and the influence of surrounding environment factor when touching, the inventor passes through repetition test in the real process, for the drive source in the circuit diagram shown in Figure 53 '; Equivalent resistance R1, R2; Stray capacitance C2, C3, resistance R 3, R4, R5, capacitor C 4; C5; C6 sets different values, and the length that touch objects is closed up is set at respectively less than the arbitrary value among the 1.2cm, thereby draws different touch-control ratio/mutual resistance curves shown in Figure 6; The resistance of the touch-control draw runner of finding when two touch objects are closed up, to surround can realize better also that in greater than 10 kilo-ohms scope touch-control compares and the monotone increasing trend of mutual resistance, thereby can judge that touch objects is in closes up or separated position.
In addition,, the touch-control draw runner that we provide present embodiment drives if connecing the existing single-point of a cover through drive wire, driving circuit 301 as shown in Figure 3, and then the touch-control draw runner that provides of present embodiment also can be used to detect the touch of single-point.
Present embodiment also provides a kind of display device that comprises above-mentioned touch induction device.
As shown in Figure 8, display device 10 comprises: LCDs 101, and touching control 102, touch-control slipping ring 103 and internal circuit (not shown), LCDs 101 can be common display screen here, and does not require it is touch display screen.Wherein, Internal circuit comprises the drive wire and the line of induction that is connected touching control 102 other ends that connects touching control 102 1 ends, and the line of induction is connected with testing circuit (testing circuit 6 as shown in Figure 5 '), drive wire input sinusoidal signal; Can provide by drive source (for example current source); Touching control, drive wire, the line of induction and testing circuit are formed touch induction device shown in Figure 7, can realize 2 detections, and through driving circuit (not shown) demonstration of LCDs 101 controlled.Internal circuit can also comprise the single-point driving circuit, connects said touching control 102, and said single-point driving circuit is exported the single-point detection signal when said touching control 102 receives single-point touches, realizes that thus single-point detects (for example single-point drag and drop control).In addition, can also realize the control of some rotary manipulations through 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 invention provides can be realized the detection to 2 touches, and only needs two extension lines, and need not to change the touching control structure or add new touching.The display device of the embodiment of the invention; For the display device of supporting 2 touches with touch display screen; Just can realize the detection of 2 touches through touching control and testing circuit; To realize that convergent-divergent control is carried out in the demonstration of display screen, therefore have advantages such as cost is low, technology is simple.
Though the present invention with preferred embodiment openly as above; But it is not to be used for limiting the present invention; Any those skilled in the art are not breaking away from the spirit and scope of the present invention; Can utilize the method and the technology contents of above-mentioned announcement that technical scheme of the present invention is made possible change and modification, therefore, every content that does not break away from technical scheme of the present invention; To any simple modification, equivalent variations and modification that above embodiment did, all belong to the protection domain of technical scheme of the present invention according to technical spirit of the present invention.
Claims (12)
1. touch induction device; It is characterized in that, comprise drive wire, touching control, the line of induction and testing circuit, an end of said drive wire is connected with an end of said touching control; Said testing circuit links to each other with the other end of said touching control through the said line of induction, and said touching control is a conductor.
2. touch induction device as claimed in claim 1; It is characterized in that; The touch-control of said touch induction device increases than the resistance of the touching control between two touch objects when taking place to touch, and the touch-control of said touch induction device reduces than the resistance of the touching control between two touch objects when touch takes place and reduces.
3. touch induction device as claimed in claim 2; It is characterized in that said touch-control ratio is: the induction current when (induction current the when induction current-touch objects when touch objects touches said touching control does not touch said touching control)/touch objects does not touch said touching control.
4. touch induction device as claimed in claim 2 is characterized in that, said touch objects is finger.
5. touch induction device as claimed in claim 3 is characterized in that, said induction current detects or calculates through said testing circuit.
6. touch induction device as claimed in claim 2 is characterized in that, the resistance of the touching control of surrounding when said two touch objects are closed up is greater than 10 kilo-ohms.
7. touch induction device as claimed in claim 1 is characterized in that, the resistance of the touching control of surrounding when said two touch objects are closed up is greater than 40 kilo-ohms.
8. touch induction device as claimed in claim 1 is characterized in that said touch induction device also comprises drive source, and said drive source is that said drive wire provides sinusoidal signal.
9. touch induction device as claimed in claim 1 is characterized in that, said testing circuit is a current amplification circuit, and the induced signal that the said line of induction is exported is converted into detection signal; Said induced signal is a current signal, and said detection signal is a voltage signal.
10. touch induction device as claimed in claim 1 is characterized in that said touch induction device also comprises the single-point driving circuit, and connects said touching control, and said single-point driving circuit is used for output single-point detection signal when said touching control receives single-point touches.
11. touch induction device as claimed in claim 1 is characterized in that, said touching control is the touch-control draw runner.
12. display device that comprises each described touch induction device of claim 1～11.
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| CN106054793A (en) * | 2016-06-17 | 2016-10-26 | 江南大学 | Pattern progress tracking and controlling device and controlling method for warp knitting machine |
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