CN102375631B - Surface capacitance contact control panel and control method thereof - Google Patents

Abstract

The invention discloses a surface capacitance contact control panel and a control method thereof. The analog-digital converter of the surface capacitance contact control panel converts the first current, second current, third current and fourth current in the first electrode, second electrode, third electrode and fourth electrode of the surface capacitance contact control panel into a first current value, a second current value, a third current value and a fourth current value respectively. The arithmetic element of the surface capacitance contact control panel computes a first contact control position according to the first current value, second current value, third current value and fourth current value at a first time point and computes a second contact control position according to the variations of the first current value, second current value, third current value and fourth current value from the first time point to a second time point.

Description

Surface-capacitive touch panel and control method thereof

Technical field

The present invention relates to a kind of surface-capacitive touch panel (surface capacitive touch panel) and control method thereof, and be particularly related to a kind of surface-capacitive touch panel and control method thereof of tool multi-point touch function.

Background technology

Along with making rapid progress of technology, no matter be the manufacturer of the electronic installations such as mobile computer, mobile phone or portable media player, all have and utilize contact panel to replace conventional keyboard with the trend as input interface of new generation.

In TaiWan, China patent announcement M361674, disclose a kind of position induction device and can respond to the touching act of more than one object, and the output induced signal relevant to object space.In U.S. Patent Publication No. 20100039405, disclose a kind of projecting type capacitor contactor control device, it can detect the position of multi-point touch, it produces first, second reference value according to first, second touch point, and filter the false touch point that the second touch point produces, to obtain real the first touch point and the second touch point.In TaiWan, China patent publication No. 200937269, disclose the apparatus and method of judging multi-contact positions on a kind of projective capacitive touch panel.In TaiWan, China patent publication No. 200842682, disclose a kind of digitial controller that uses true Multi-contact surface.In TaiWan, China patent publication No. 200847001, disclose a kind of method and system of the dumb show with multipoint sensing device, it can simultaneously or almost simultaneously detect multiple objects (for example: finger).In TaiWan, China patent announcement M368849, disclose a kind of multiple spot condenser type touch sensor.In TaiWan, China patent publication No. 200938861, disclose a kind of capacitive detection system, module and method.In TaiWan, China patent publication No. 201001258, disclose a kind of device and method that determines at least more than one object's position at surface in contact.In U.S. Patent Publication No. 20090085894, disclose a kind of there is transparent nano structural membrane can multi-point touch screen, it can accept multi-point touch simultaneously, and analyzes the data of this multiple spot.In U.S. Patent Publication No. 20070109280, disclose a kind of apparatus and method that can multi-point touch, its more for the first time touch point and touch point for the second time mistiming whether in the given time, to determine its start behavior.In U.S. Patent Publication No. 20080150906, disclose a kind of have multiaxis to touch sensing device, it can analyze the position of multi-point touch.In TaiWan, China patent 200933456, disclose a kind of Trackpad and application process thereof that carries out multi-object operation.In No. 7254775 patent of the U.S., disclose a kind of differentiation and refer to the System and method for of touch-control simultaneously more, to obtain the tram that refers to touch-control more.In addition,, in No. 4353552 patent of the U.S., disclosed a kind of surface-capacitive touch panel of single-point touch.

Summary of the invention

The present invention proposes a kind of surface-capacitive touch panel, it puts the electric current of four electrodes of the surface-capacitive touch panel of flowing through respectively according to the very first time, calculate the first position of touch, and calculate the second position of touch according to very first time o'clock to the current change quantity of above-mentioned four electrodes of flowing through during the second time point.

The present invention proposes a kind of control method of surface-capacitive touch panel, and it,, according to the flow through electric current of four electrodes of surface-capacitive touch panel of former and later two time points, calculates the first position of touch and the second position of touch.

Other object of the present invention and advantage can be further understood from the disclosed technical characterictic of the present invention.

For reaching above-mentioned one or part or all of object or other object, one embodiment of the invention provide a kind of surface-capacitive touch panel.Surface-capacitive touch panel comprises conducting film and driving circuit.Driving circuit comprises analog-digital converter and arithmetic element.Conducting film, is provided with the first electrode, the second electrode, third electrode and the 4th electrode.Driving circuit, be coupled to the first electrode, the second electrode, third electrode and the 4th electrode, in order to transmit flow through the 3rd electric current of the first electric current of the first electrode, the second electric current of second electrode of flowing through, the third electrode of flowing through and the 4th electric current of the 4th electrode of flowing through.Analog-digital converter, in order to convert respectively the first electric current, the second electric current, the 3rd electric current and the 4th electric current to the first current value, the second current value, the 3rd current value and the 4th current value.Arithmetic element, be coupled to analog-digital converter, calculate the first position of touch in order to the first current value, the second current value, the 3rd current value and the 4th current value that are dependent on very first time point, and according to the first current value, the second current value, the 3rd current value and the 4th current value the variable quantity during in very first time o'clock to the second time point, calculate the second position of touch.

One embodiment of the invention provide a kind of method of control surface capacitance type touch-control panel.Said method comprises: convert respectively the first electric current of the first electrode of the surface-capacitive touch panel of flowing through, the second electrode, third electrode and the 4th electrode, the second electric current, the 3rd electric current and the 4th electric current to the first current value, the second current value, the 3rd current value and the 4th current value by analog-digital converter; The first current value, the second current value, the 3rd current value and the 4th current value that are dependent on very first time point calculate the first position of touch; And according to the first current value, the second current value, the 3rd current value and the 4th current value the variable quantity during in very first time o'clock to the second time point, calculate the second position of touch.

In one embodiment of this invention, above-mentioned driving circuit also comprises storage unit, in order to be stored in the first current value, the second current value, the 3rd current value and the 4th current value of very first time point.When at the second time point, arithmetic element reads the first current value, the second current value, the 3rd current value and the 4th current value that are stored in storage unit, and be received in the first current value, the second current value, the 3rd current value and the 4th current value of the second time point from analog-digital converter, to calculate the second position of touch.

In one embodiment of this invention, the first above-mentioned current value, the second current value, the 3rd current value and the 4th current value are respectively I in very first time point _1t1, I _2t1, I _3t1and I _4t1.The first current value, the second current value, the 3rd current value and the 4th current value are respectively I in the second time point _1t2, I _2t2, I _3t2and I _4t2, and the first position of touch equals , and the second position of touch equals .Wherein Δ I _1t2=I _1t2-I _1t1, Δ I _2t2=I _2t2-I _2t1, Δ I _3t2=I _3t2-I _3t1, Δ I _4t2=I _4t2-I _4t1

In one embodiment of this invention, above-mentioned arithmetic element is the variable quantity during in very first time o'clock to the 3rd time point according to the first current value, the second current value, the 3rd current value and the 4th current value, calculates the 3rd position of touch.

In one embodiment of this invention, the first above-mentioned current value, the second current value, the 3rd current value and the 4th current value are respectively I in very first time point _1t1, I _2t1, I _3t1and I _4t1.The first current value, the second current value, the 3rd current value and the 4th current value are respectively I in the second time point _1t2, I _2t2, I _3t2and I _4t2.The first current value, the second current value, the 3rd current value and the 4th current value are respectively I in the 3rd time point _1t3, I _2t3, I _3t3and I _4t3.The first position of touch equals

, the second position of touch equals

, the 3rd position of touch equals $(\frac{{\mathrm{\ΔI}}_{2t3}+{\mathrm{\ΔI}}_{4t3}}{{\mathrm{\ΔI}}_{1t3}+{\mathrm{\ΔI}}_{2t3}+{\mathrm{\ΔI}}_{3t3}+{\mathrm{\ΔI}}_{4t3}},\frac{{\mathrm{\ΔI}}_{3t3}+{\mathrm{\ΔI}}_{4t3}}{{\mathrm{\ΔI}}_{1t3}+{\mathrm{\ΔI}}_{2t3}+{\mathrm{\ΔI}}_{3t3}+{\mathrm{\ΔI}}_{4t3}})$ 。Wherein Δ I _1t2=I _1t2-I _1t1, Δ I _2t2=I _2t2-I _2t1, Δ I _3t2=I _3t2-I _3t1, Δ I _4t2=I _4t2-I _4t1, Δ I _1t3=I _1t3-I _1t1, Δ I _2t3=I _2t3-I _2t1, Δ I _3t3=I _3t3-I _3t1, Δ I _4t3=I _4t3-I _4t1.

In one embodiment of this invention, above-mentioned arithmetic element, according to the first position of touch, the second position of touch and the 3rd position of touch, is amplified, is dwindled or target rotation.

In the above embodiment of the present invention, surface-capacitive touch panel is put the electric current of its four electrodes of flowing through respectively according to the very first time, calculate the first position of touch, and calculate the second position of touch according to very first time o'clock to the current change quantity of above-mentioned four electrodes of flowing through during the second time point, and make surface-capacitive touch panel there is the function of multi-point touch.

For above-mentioned feature and advantage of the present invention can be become apparent, multiple embodiment cited below particularly, and by reference to the accompanying drawings, be described in detail below.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of the surface-capacitive touch panel of one embodiment of the invention;

Fig. 2 is the top view of a panel body in Fig. 1;

Fig. 3 is the functional block diagram of the surface-capacitive touch panel of Fig. 1;

Fig. 4 is the situation in the time that panel body is not touched in order to the surface-capacitive touch panel that illustrates Fig. 1;

Fig. 5 in order to the surface-capacitive touch panel that illustrates Fig. 1 at panel body the situation during by user's a finger touches;

Fig. 6 in order to the surface-capacitive touch panel that illustrates Fig. 1 at panel body the situation during by two finger touches of user;

Fig. 7 has illustrated in the time amplifying object, the variation situation of user's two fingers;

Fig. 8 has illustrated in the time of reduced objects, the variation situation of user's two fingers;

Fig. 9 has illustrated in the time of target rotation, the variation situation of user's two fingers.

Embodiment

About aforementioned and other technology contents, feature and effect of the present invention, in the detailed description of the preferred embodiment below in conjunction with accompanying drawing, can clearly present.The direction term of mentioning in following examples, for example: upper and lower, left and right, front or rear etc. are only the directions with reference to accompanying drawing.Therefore, the direction term of use is to be not used for limiting the present invention for illustrating.

The know-why of surface-capacitive touch panel (surface capacitive touch panel) is for example, at a conductive plane (indium tin oxide (indium tin oxide; ITO) film or glass) four corners a voltage is provided, make it form a uniform electric field at conductive plane, when people's finger contact is during to conductive plane, electric current just can flow through generation signal from finger, just can calculate by the current signal in four corners the place, position that finger touches.

Referring to figs. 1 through Fig. 3.Fig. 1 is the schematic diagram of the surface-capacitive touch panel 100 of one embodiment of the invention, and Fig. 2 is the top view of a panel body 200 in Fig. 1, the functional block diagram of the surface-capacitive touch panel 100 that Fig. 3 is Fig. 1.Surface-capacitive touch panel 100 has driving circuit 110 and panel body 200.Panel body 200 has substrate 202, conducting film 204 and diaphragm 206.In an embodiment of the present invention, the material of substrate 202 is for example transparent glass, and the material of conducting film 204 is for example indium tin oxide (indium tin oxide; ITO), the material of diaphragm 206 is for example silicon dioxide (silicon dioxide; SiO ₂), so the present invention is not as limit.Between substrate 202 and conducting film 204, can form panel capacitance, and for convenience of representing, this panel capacitance represents with Cp in Fig. 1.Conducting film 204 is provided with the first electrode 210, the second electrode 220, third electrode 230 and the 4th electrode 240.As shown in Figure 2, in the present embodiment, the first electrode 210, the second electrode 220, third electrode 230 and the 4th electrode 240 are separately positioned on four corners of panel body 200.Driving circuit 110 is coupled to the first electrode 210, the second electrode 220, third electrode 230 and the 4th electrode 240, to transmit respectively the first electric current I ₁, the second electric current I ₂, the 3rd electric current I ₃, the 4th electric current I ₄to the first electrode 210, the second electrode 220, third electrode 230 and the 4th electrode 240.Because human body is electric conductor, when people's finger contact is during to conducting film 204, can produce capacitive coupling with the electric field of conducting film 204, therefore the capacitance of panel capacitance Cp can change.Because of the change of the capacitance of panel capacitance Cp, the first electric current I of flow through the first electrode 210, the second electrode 220, third electrode 230 and the 4th electrode 240 ₁, the second electric current I ₂, the 3rd electric current I ₃, the 4th electric current I ₄also can and then change.Driving circuit 110 can be according to the first electric current I ₁, the second electric current I ₂, the 3rd electric current I ₃, the 4th electric current I ₄variation, calculate the coordinate of corresponding touch point.

Driving circuit 110 has analog-digital converter 112 and arithmetic element 114.Analog-digital converter 112 is in order to by the first electric current I ₁, the second electric current I ₂, the 3rd electric current I ₃, the 4th electric current I ₄convert respectively the first current value, the second current value, the 3rd current value and the 4th current value to.And arithmetic element 114 is coupled to analog-digital converter 112, in order to the first current value, the second current value, the 3rd current value and the 4th current value exported according to analog-digital converter 112, calculate corresponding position of touch.In addition, in an embodiment of the present invention, driving circuit 110 also comprises storage unit 116, in order to the temporary required information of arithmetic element 114.In the following description, in connection with accompanying drawing, the control mode of surface-capacitive touch panel 100 is described.

With reference to Fig. 4, Fig. 4 is the situation in the time that panel body 200 is not touched in order to the surface-capacitive touch panel 100 that illustrates Fig. 1.In the time that panel body 200 is not touched, the first electric current I ₁, the second electric current I ₂, the 3rd electric current I ₃, the 4th electric current I ₄very little.In the present embodiment, the first electric current I now ₁, the second electric current I ₂, the 3rd electric current I ₃, the 4th electric current I ₄be respectively 10 micromicroamperes (μ A).

With reference to Fig. 5, Fig. 5 in order to the surface-capacitive touch panel 100 that illustrates Fig. 1 at panel body 200 situation during by user's a finger touches.At very first time point, because user's a finger touches arrives panel body 200, the capacitance of panel capacitance Cp can change, and causes the first electric current I ₁, the second electric current I ₂, the 3rd electric current I ₃with the 4th electric current I ₄change.As shown in Figure 5, the first electric current I now ₁, the second electric current I ₂, the 3rd electric current I ₃and the 4th electric current I ₄be respectively 300 micromicroamperes, 100 micromicroamperes, 300 micromicroamperes and 100 micromicroamperes.The first electric current I ₁, the second electric current I ₂, the 3rd electric current I ₃and the 4th electric current I ₄size relevant with the position that user touches panel body 200.In other words, when user touch panel body 200 position change time, the first electric current I ₁, the second electric current I ₂, the 3rd electric current I ₃with the 4th electric current I ₄size can change accordingly.Analog-digital converter 112 can be by the first electric current I ₁, the second electric current I ₂, the 3rd electric current I ₃with the 4th electric current I ₄convert respectively the first current value, the second current value, the 3rd current value and the 4th current value to.Take Fig. 5 as example, at very first time point, the first current value, the second current value, the 3rd current value and the 4th current value are respectively I _1t1, I _2t1, I _3t1and I _4t1.The current value that arithmetic element 114 converts to according to analog-digital converter 112, the coordinate that calculates the first position of touch A is

, and above-mentioned coordinate is take the upper left corner of panel body 200 as its initial point.In addition, in an embodiment of the present invention, the first current value I _1t1, the second current value I _2t1, the 3rd current value I _3t1and the 4th current value I _4t1can be stored in storage unit 116, and foundation while carrying out subsequent calculations as arithmetic element 114.

With reference to Fig. 6, Fig. 6 in order to the surface-capacitive touch panel 100 that illustrates Fig. 1 at panel body 200 situation during by two finger touches of user.At the second time point, because another finger touches of user arrives the second position of touch B of panel body 200, and the capacitance of panel capacitance Cp is changed, and cause the first electric current I ₁, the second electric current I ₂, the 3rd electric current I ₃with the 4th electric current I ₄change.As shown in Figure 6, the first electric current I now ₁, the second electric current I ₂, the 3rd electric current I ₃and the 4th electric current I ₄be all 400 micromicroamperes.It should be noted that above-mentioned the first electric current I ₁, the second electric current I ₂, the 3rd electric current I ₃and the 4th electric current I ₄size relevant with the first position of touch A and the coordinate of the second position of touch B on panel body 200, and the numerical value of each electric current is only as exemplary explanation above, the present invention should be as limit.

At the second time point, analog-digital converter 112 also can be by the first electric current I ₁, the second electric current I ₂, the 3rd electric current I ₃with the 4th electric current I ₄convert respectively the first current value, the second current value, the 3rd current value and the 4th current value to.Take Fig. 6 as example, at the second time point, the first current value, the second current value, the 3rd current value and the 4th current value are respectively I _1t2, I _2t2, I _3t2and I _4t2.Arithmetic element 114 is the variable quantity during in very first time o'clock to the second time point according to the first current values, the second current value, the 3rd current value and the 4th current value, and the coordinate that calculates the second position of touch B is $(\frac{{\mathrm{\ΔI}}_{2t2}+{\mathrm{\ΔI}}_{4t2}}{{\mathrm{\ΔI}}_{1t2}+{\mathrm{\ΔI}}_{2t2}+{\mathrm{\ΔI}}_{3t2}+{\mathrm{\ΔI}}_{4t2}},\frac{{\mathrm{\ΔI}}_{3t2}+{\mathrm{\ΔI}}_{4t2}}{{\mathrm{\ΔI}}_{1t2}+{\mathrm{\ΔI}}_{2t2}+{\mathrm{\ΔI}}_{3t2}+{\mathrm{\ΔI}}_{4t2}})$ , wherein Δ I _1t2=I _1t2-I _1t1, Δ I _2t2=I _2t2-I _2t1, Δ I _3t2=I _3t2-I _3t1, Δ I _4t2=I _4t2-I _4t1.

User can amplify, dwindle or target rotation at the finger of the second position of touch B by mobile.Wherein, above-mentioned object is for example picture or the window on computer screen.With reference to Fig. 6 and Fig. 7, wherein Fig. 7 has illustrated in the time amplifying object, the variation situation of user's two fingers.At the 3rd time point, user's finger moves to the 3rd position of touch B ' from the second position of touch B.Now, the first current value, the second current value, the 3rd current value and the 4th current value are respectively I _1t3, I _2t3, I _3t3and I _4t3.Arithmetic element 114 is the variable quantity during in very first time o'clock to the 3rd time point according to the first current values, the second current value, the 3rd current value and the 4th current value, and the coordinate that calculates the 3rd position of touch B ' is

, wherein Δ I _1t3=I _1t3-I _1t1, Δ I _2t3=I _2t3-I _2t1, Δ I _3t3=I _3t3-I _3t1, Δ I _4t3=I _4t3-I _4t1.Afterwards, arithmetic element 114 is further according to the coordinate of the first position of touch A, the second position of touch B and the 3rd position of touch B ', the variation situation of two fingers that judge user during the second time point to the three time points, to control the action of above-mentioned object.Take Fig. 7 as example, because of during the second time point to the three time points, the horizontal range between two fingers of user has increased and vertical range does not change haply, therefore arithmetic element 114 can produce corresponding control signal, to amplify object.

Except amplify object to, also can accomplish to dwindle the function with target rotation.With reference to Fig. 8, Fig. 8 has illustrated in the time of reduced objects, the variation situation of user's two fingers.Similarly, at the 3rd time point, user's finger moves to the 3rd position of touch B ' from the second position of touch B.Because of during the second time point to the three time points, the horizontal range between two fingers of user has been dwindled and vertical range does not change haply, therefore arithmetic element 114 can produce corresponding control signal, with reduced objects.

With reference to Fig. 9, Fig. 9 has illustrated in the time of target rotation, the variation situation of user's two fingers.Similarly, at the 3rd time point, user's finger moves to the 3rd position of touch B ' from the second position of touch B.Because of during the second time point to the three time points, finger is from the rough camber of track of the second position of touch B to the three position of touch B ', therefore arithmetic element 114 can produce corresponding control signal, with along positive clock direction rotation object.

In sum, in the above embodiment of the present invention, at least there is following one of them advantage, surface-capacitive touch panel is put the electric current of its four electrodes of flowing through respectively according to the very first time, calculate the first position of touch, and calculate the second position of touch according to very first time o'clock to the current change quantity of its four electrodes of flowing through during the second time point, and make surface-capacitive touch panel there is the function of multi-point touch.In addition, along with the change of user's position of touch, the computing unit of surface-capacitive touch panel can produce corresponding control signal, to amplify, to dwindle or target rotation.

The above, be only the preferred embodiments of the present invention, when not limiting scope of the invention process with this, the simple equivalence of generally doing according to the claims in the present invention and invention description content changes and modifies, and all still remains within the scope of the patent.Arbitrary embodiment of the present invention or claim scope must not reached the disclosed whole objects of the present invention or advantage or feature in addition.In addition, summary part and title are only for the use of auxiliary patent document search, are not used for limiting interest field of the present invention.

Claims (11)

1. a surface-capacitive touch panel, comprising:

Conducting film, is provided with the first electrode, the second electrode, third electrode and the 4th electrode; And

Driving circuit, be coupled to described the first electrode, described the second electrode, described third electrode and described the 4th electrode, in order to transmit flow through the 3rd electric current of the first electric current of described the first electrode, the second electric current of described the second electrode of flowing through, the described third electrode of flowing through and the 4th electric current of described the 4th electrode of flowing through, described driving circuit comprises:

Analog-digital converter, in order to convert respectively described the first electric current, described the second electric current, described the 3rd electric current and described the 4th electric current to the first current value, the second current value, the 3rd current value and the 4th current value; And

Arithmetic element, be coupled to described analog-digital converter, in order to be dependent on described first current value of very first time point, described the second current value, described the 3rd current value and described the 4th current value calculate the first position of touch, and according to described the first current value, described the second current value, described the 3rd current value and described the 4th current value variable quantity during in described very first time o'clock to the second time point, calculate the second position of touch, wherein said very first time point is that a point is while touching described contact panel, and described the second time point is two points while touching described contact panel.

2. surface-capacitive touch panel as claimed in claim 1, wherein said driving circuit also comprises storage unit, in order to be stored in described first current value of described very first time point, described the second current value, described the 3rd current value and described the 4th current value, and when at described the second time point, described arithmetic element reads described the first current value that is stored in described storage unit, described the second current value, described the 3rd current value and described the 4th current value, and be received in described first current value of described the second time point from described analog-digital converter, described the second current value, described the 3rd current value and described the 4th current value, to calculate described the second position of touch.

3. surface-capacitive touch panel as claimed in claim 1, wherein said the first current value, described the second current value, described the 3rd current value and described the 4th current value are respectively I in described very first time point _1t1, I _2t1, I _3t1and I _4t1, described the first current value, described the second current value, described the 3rd current value and described the 4th current value are respectively I in described the second time point _1t2, I _2t2, I _3t2and I _4t2, and described the first position of touch equals $(\frac{I_{2t1}+I_{4t1}}{I_{1t1}+I_{2t1}+I_{3t1}+I_{4t1}},\frac{I_{3t1}+I_{4t1}}{I_{1t1}+I_{2t1}+I_{3t1}+I_{4t1}}),$ Described the second position of touch equals $(\frac{\mathrm{\Δ}{I}_{2t2}+\mathrm{\Δ}{I}_{4t2}}{\mathrm{\Δ}{I}_{1t2}+\mathrm{\Δ}{I}_{2t2}+\mathrm{\Δ}{I}_{3t2}+\mathrm{\Δ}{I}_{4t2}},\frac{\mathrm{\Δ}{I}_{3t2}+\mathrm{\Δ}{I}_{4t2}}{\mathrm{\Δ}{I}_{1t2}+\mathrm{\Δ}{I}_{2t2}+\mathrm{\Δ}{I}_{3t2}+\mathrm{\Δ}{I}_{4t2}}),$ Wherein Δ I _1t2=I _1t2-I _1t1, Δ I _2t2=I _2t2-I _2t1, Δ I _3t2=I _3t2-I _3t1, Δ I _4t2=I _4t2-I _4t1.

4. surface-capacitive touch panel as claimed in claim 1, wherein said arithmetic element is the variable quantity during in described very first time o'clock to the 3rd time point according to described the first current value, described the second current value, described the 3rd current value and described the 4th current value, calculates the 3rd position of touch.

5. surface-capacitive touch panel as claimed in claim 4, wherein said the first current value, described the second current value, described the 3rd current value and described the 4th current value are respectively I in described very first time point _1t1, I _2t1, I _3t1and I _4t1, described the first current value, described the second current value, described the 3rd current value and described the 4th current value are respectively I in described the second time point _1t2, I _2t2, I _3t2and I _4t2, described the first current value, described the second current value, described the 3rd current value and described the 4th current value are respectively I in described the 3rd time point _1t3, I _2t3, I _3t3and I _4t3, and described the first position of touch equals $(\frac{I_{2t1}+I_{4t1}}{I_{1t1}+I_{2t1}+I_{3t1}+I_{4t1}},\frac{I_{3t1}+I_{4t1}}{I_{1t1}+I_{2t1}+I_{3t1}+I_{4t1}}),$ Described the second position of touch equals $(\frac{\mathrm{\Δ}{I}_{2t2}+\mathrm{\Δ}{I}_{4t2}}{\mathrm{\Δ}{I}_{1t2}+\mathrm{\Δ}{I}_{2t2}+\mathrm{\Δ}{I}_{3t2}+\mathrm{\Δ}{I}_{4t2}},\frac{\mathrm{\Δ}{I}_{3t2}+\mathrm{\Δ}{I}_{4t2}}{\mathrm{\Δ}{I}_{1t2}+\mathrm{\Δ}{I}_{2t2}+\mathrm{\Δ}{I}_{3t2}+\mathrm{\Δ}{I}_{4t2}}),$ Described the 3rd position of touch equals $(\frac{\mathrm{\Δ}{I}_{2t3}+\mathrm{\Δ}{I}_{4t3}}{\mathrm{\Δ}{I}_{1t3}+\mathrm{\Δ}{I}_{2t3}+\mathrm{\Δ}{I}_{3t3}+\mathrm{\Δ}{I}_{4t3}},\frac{\mathrm{\Δ}{I}_{3t3}+\mathrm{\Δ}{I}_{4t3}}{\mathrm{\Δ}{I}_{1t3}+\mathrm{\Δ}{I}_{2t3}+\mathrm{\Δ}{I}_{3t3}+\mathrm{\Δ}{I}_{4t3}}),$ Wherein Δ I _1t2=I _1t2-I _1t1, Δ I _2t2=I _2t2-I _2t1, Δ I _3t2=I _3t2-I _3t1, Δ I _4t2=I _4t2-I _4t1, Δ I _1t3=I _1t3-I _1t1, Δ I _2t3=I _2t3-I _2t1, Δ I _3t3=I _3t3-I _3t1, Δ I _4t3=I _4t3-I _4t1.

6. surface-capacitive touch panel as claimed in claim 4, wherein said arithmetic element, according to described the first position of touch, described the second position of touch and described the 3rd position of touch, is amplified, is dwindled or target rotation.

7. a method for control surface capacitance type touch-control panel, comprising:

By analog-digital converter, convert respectively the first electric current of the first electrode of the described surface-capacitive touch panel of flowing through, the second electrode, third electrode and the 4th electrode, the second electric current, the 3rd electric current and the 4th electric current to the first current value, the second current value, the 3rd current value and the 4th current value;

Described the first current value, described the second current value, described the 3rd current value and described the 4th current value that are dependent on very first time point calculate the first position of touch; And

Variable quantity according to described the first current value, described the second current value, described the 3rd current value and described the 4th current value during in described very first time o'clock to the second time point, calculate the second position of touch, wherein said very first time point is a point while touching described contact panel, and described the second time point is when to be two points touch described contact panel.

8. method as claimed in claim 7, wherein said the first current value, described the second current value, described the 3rd current value and described the 4th current value are respectively I in described very first time point _1t1, I _2t1, I _3t1and I _4t1, described the first current value, described the second current value, described the 3rd current value and described the 4th current value are respectively I in described the second time point _1t2, I _2t2, I _3t2and I _4t2, and described the first position of touch equals $(\frac{I_{2t1}+I_{4t1}}{I_{1t1}+I_{2t1}+I_{3t1}+I_{4t1}},\frac{I_{3t1}+I_{4t1}}{I_{1t1}+I_{2t1}+I_{3t1}+I_{4t1}}),$ Described the second position of touch equals $(\frac{\mathrm{\Δ}{I}_{2t2}+\mathrm{\Δ}{I}_{4t2}}{\mathrm{\Δ}{I}_{1t2}+\mathrm{\Δ}{I}_{2t2}+\mathrm{\Δ}{I}_{3t2}+\mathrm{\Δ}{I}_{4t2}},\frac{\mathrm{\Δ}{I}_{3t2}+\mathrm{\Δ}{I}_{4t2}}{\mathrm{\Δ}{I}_{1t2}+\mathrm{\Δ}{I}_{2t2}+\mathrm{\Δ}{I}_{3t2}+\mathrm{\Δ}{I}_{4t2}}),$ Wherein Δ I _1t2=I _1t2-I _1t1, Δ I _2t2=I _2t2-I _2t1, Δ I _3t2=I _3t2-I _3t1, Δ I _4t2=I _4t2-I _4t1.

9. method as claimed in claim 7, also comprises:

Variable quantity according to described the first current value, described the second current value, described the 3rd current value and described the 4th current value during in described very first time o'clock to the 3rd time point, calculates the 3rd position of touch.

10. method as claimed in claim 9, wherein said the first current value, described the second current value, described the 3rd current value and described the 4th current value are respectively I in described very first time point _1t1, I _2t1, I _3t1and I _4t1, described the first current value, described the second current value, described the 3rd current value and described the 4th current value are respectively I in described the second time point _1t2, I _2t2, I _3t2and I _4t2, described the first current value, described the second current value, described the 3rd current value and described the 4th current value are respectively I in described the 3rd time point _1t3, I _2t3, I _3t3and I _4t3, and described the first position of touch equals $(\frac{I_{2t1}+I_{4t1}}{I_{1t1}+I_{2t1}+I_{3t1}+I_{4t1}},\frac{I_{3t1}+I_{4t1}}{I_{1t1}+I_{2t1}+I_{3t1}+I_{4t1}}),$ Described the second position of touch equals $(\frac{\mathrm{\Δ}{I}_{2t2}+\mathrm{\Δ}{I}_{4t2}}{\mathrm{\Δ}{I}_{1t2}+\mathrm{\Δ}{I}_{2t2}+\mathrm{\Δ}{I}_{3t2}+\mathrm{\Δ}{I}_{4t2}},\frac{\mathrm{\Δ}{I}_{3t2}+\mathrm{\Δ}{I}_{4t2}}{\mathrm{\Δ}{I}_{1t2}+\mathrm{\Δ}{I}_{2t2}+\mathrm{\Δ}{I}_{3t2}+\mathrm{\Δ}{I}_{4t2}}),$ Described the 3rd position of touch equals $(\frac{\mathrm{\Δ}{I}_{2t3}+\mathrm{\Δ}{I}_{4t3}}{\mathrm{\Δ}{I}_{1t3}+\mathrm{\Δ}{I}_{2t3}+\mathrm{\Δ}{I}_{3t3}+\mathrm{\Δ}{I}_{4t3}},\frac{\mathrm{\Δ}{I}_{3t3}+\mathrm{\Δ}{I}_{4t3}}{\mathrm{\Δ}{I}_{1t3}+\mathrm{\Δ}{I}_{2t3}+\mathrm{\Δ}{I}_{3t3}+\mathrm{\Δ}{I}_{4t3}}),$ Wherein Δ I _1t2=I _1t2-I _1t1, Δ I _2t2=I _2t2-I _2t1, Δ I _3t2=I _3t2-I _3t1, Δ I _4t2=I _4t2-I _4t1, Δ I _1t3=I _1t3-I _1t1, Δ I _2t3=I _2t3-I _2t1, Δ I _3t3=I _3t3-I _3t1, Δ I _4t3=I _4t3-I _4t1.

11. methods as claimed in claim 9, also comprise:

According to described the first position of touch, described the second position of touch and described the 3rd position of touch, amplify, dwindle or target rotation.

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