CN102375631B - Surface capacitive touch panel and control method thereof - Google Patents

Abstract

A surface capacitive touch panel and a control method thereof. The analog-to-digital converter of the surface capacitive touch panel converts a first current, a second current, a third current and a fourth current flowing through a first electrode, a second electrode, a third electrode and a fourth electrode of the surface capacitive touch panel into a first current value, a second current value, a third current value and a fourth current value respectively. The arithmetic unit of the surface capacitive touch panel calculates a first touch position according to a first current value, a second current value, a third current value and a fourth current value at a first time point, and calculates a second touch position according to the variation of the first current value, the second current value, the third current value and the 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 surface capacitive touch panel (surface capacitive touch panel) and its control method, and in particular to a surface capacitive touch panel with multi-touch function and its control method.

Background technique

With the rapid development of technology, manufacturers of electronic devices such as notebook computers, mobile phones, and portable multimedia players all have a tendency to use touch panels to replace traditional keyboards as a new generation of input interfaces.

In Taiwan Patent Publication No. M361674, a position sensing device is disclosed which can sense the contact behavior of more than one object and output a sensing signal related to the position of the object. In US Patent Publication No. 20100039405, a projected capacitive touch device is disclosed, which can detect the position of multi-touch, and generate first and second reference values according to the first and second touch points, and filter the first and second reference values. False touch points generated by the two touch points to obtain real first touch points and second touch points. In Taiwan Patent Publication No. 200937269, a device and method for determining the positions of multiple touch points on a projected capacitive touch panel are disclosed. In Taiwan Patent Publication No. 200842682, a digital controller that can use a real multi-touch surface is disclosed. In Taiwan Patent Publication No. 200847001, a method and system for gesturing with a multi-point sensing device is disclosed, which can detect multiple objects (such as fingers) simultaneously or almost simultaneously. In Taiwan Patent Publication No. M368849, a multi-point capacitive touch sensor is disclosed. In China Taiwan Patent Publication No. 200938861, a capacitance detection system, module and method are disclosed. In Taiwan Patent Publication No. 201001258, a device and method for determining the position of at least one object on a contact surface are disclosed. In US Patent Publication No. 20090085894, a multi-touch screen with a transparent nanostructure film is disclosed, which can receive multiple touches simultaneously and analyze the data of the multiple points. In US Patent Publication No. 20070109280, a multi-touch device and method are disclosed, which compares whether the time difference between the first touch point and the second touch point is within a predetermined time to determine its actuation behavior . In US Patent Publication No. 20080150906, a multi-axis touch sensing device is disclosed, which can analyze the position of multi-touch. In Taiwan Patent No. 200933456, a touch panel capable of multi-object operation and its application method are disclosed. In US Patent No. 7254775, a system and method for distinguishing multi-finger simultaneous touches are disclosed, so as to obtain the correct position of multi-finger touches. In addition, in US Pat. No. 4,353,552, a single-touch surface capacitive touch panel is disclosed.

Contents of the invention

The present invention proposes a surface capacitive touch panel, which calculates the first touch position according to the current flowing through the four electrodes of the surface capacitive touch panel at the first time point, and calculates the first touch position according to the first time point to the second The second touch position is calculated by the amount of current change flowing through the four electrodes during the two time points.

The present invention proposes a control method for a surface capacitive touch panel, which calculates the first touch position and the second touch position according to the currents flowing through the four electrodes of the surface capacitive touch panel at two time points before and after .

Other purposes and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

To achieve one or part or all of the above objectives or other objectives, an embodiment of the present invention provides a surface capacitive touch panel. A surface capacitive touch panel includes a conductive film and a driving circuit. The drive circuit includes an analog-to-digital converter and an arithmetic unit. The conductive film is provided with a first electrode, a second electrode, a third electrode and a fourth electrode. The drive circuit, coupled to the first electrode, the second electrode, the third electrode and the fourth electrode, is used to transmit the first current flowing through the first electrode, the second current flowing through the second electrode, and the third electrode The third current and the fourth current flowing through the fourth electrode. The analog-to-digital converter is used to convert the first current, the second current, the third current and the fourth current into the first current value, the second current value, the third current value and the fourth current value respectively. The computing unit is coupled to the analog-to-digital converter, and is used for calculating the first touch position according to the first current value, the second current value, the third current value and the fourth current value at the first time point, and according to the first current value The variation of the first current value, the second current value, the third current value and the fourth current value during the period from the first time point to the second time point is used to calculate the second touch position.

An embodiment of the invention provides a method for controlling a surface capacitive touch panel. The above method includes: converting the first current, the second current, the third current and the fourth current flowing through the first electrode, the second electrode, the third electrode and the fourth electrode of the surface capacitive touch panel to The current is respectively converted into a first current value, a second current value, a third current value and a fourth current value; based on the first current value, the second current value, the third current value and the fourth current value at the first time point Calculate the first touch position; and calculate the second touch position according to the variation of the first current value, the second current value, the third current value and the fourth current value from the first time point to the second time point. control position.

In an embodiment of the present invention, the above driving circuit further includes a storage unit for storing the first current value, the second current value, the third current value and the fourth current value at the first time point. When at the second time point, the computing unit reads the first current value, the second current value, the third current value, and the fourth current value stored in the storage unit, and receives the current value at the second time point from the analog-to-digital converter. The first current value, the second current value, the third current value and the fourth current value are used to calculate the second touch position.

In an embodiment of the present invention, the above-mentioned first current value, second current value, third current value and fourth current value are respectively I _1t1 , I _2t1 , I _3t1 and I _4t1 at the first time point. The first current value, the second current value, the third current value and the fourth current value are respectively I _1t2 , I _2t2 , I _3t2 and I _4t2 at the second time point, and the first touch position is equal to , and the second touch position is equal to . Where ΔI _1t2 =I _1t2 -I _1t1 , ΔI _2t2 =I _2t2 -I _2t1 , ΔI _3t2 =I _3t2 -I _3t1 , ΔI _4t2 =I _4t2 -I _4t1

In an embodiment of the present invention, the above-mentioned calculation unit calculates according to the variation of the first current value, the second current value, the third current value and the fourth current value from the first time point to the third time point out of the third touch position.

，第二触控位置等于

，第三触控位置等于 $(\frac{{\mathrm{\ΔI}}_{2t3}+{\mathrm{\ΔI}}_{4t3}}{{\mathrm{\ΔI}}_{1t3}+{\mathrm{\ΔI}}_{2t3}+{\mathrm{\ΔI}}_{3t3}+{\mathrm{\ΔI}}_{4t3}},\frac{{\mathrm{\ΔI}}_{3t3}+{\mathrm{\ΔI}}_{4t3}}{{\mathrm{\ΔI}}_{1t3}+{\mathrm{\ΔI}}_{2t3}+{\mathrm{\ΔI}}_{3t3}+{\mathrm{\ΔI}}_{4t3}})$ 。其中ΔI_1t2＝I_1t2-I_1t1、ΔI_2t2＝I_2t2-I_2t1、ΔI_3t2＝I_3t2-I_3t1、ΔI_4t2＝I_4t2-I_4t1、ΔI_1t3＝I_1t3-I_1t1、ΔI_2t3＝I_2t3-I_2t1、ΔI_3t3＝I_3t3-I_3t1、ΔI_4t3＝I_4t3-I_4t1。In an embodiment of the present invention, the above-mentioned first current value, second current value, third current value and fourth current value are respectively I _1t1 , I _2t1 , I _3t1 and I _4t1 at the first time point. The first current value, the second current value, the third current value and the fourth current value are respectively I _1t2 , I _2t2 , I _3t2 and I _4t2 at the second time point. The first current value, the second current value, the third current value and the fourth current value are respectively I _1t3 , I _2t3 , I _3t3 and I _4t3 at the third time point. The first touch position is equal to

, the second touch position is equal to

, the third touch position is equal to $(\frac{{\mathrm{\ΔI}}_{2t3}+{\mathrm{\ΔI}}_{4t3}}{{\mathrm{\ΔI}}_{1t3}+{\mathrm{\ΔI}}_{2t3}+{\mathrm{\ΔI}}_{3t3}+{\mathrm{\ΔI}}_{4t3}},\frac{{\mathrm{\ΔI}}_{3t3}+{\mathrm{\ΔI}}_{4t3}}{{\mathrm{\ΔI}}_{1t3}+{\mathrm{\ΔI}}_{2t3}+{\mathrm{\ΔI}}_{3t3}+{\mathrm{\ΔI}}_{4t3}})$ . where ΔI _1t2 =I _1t2 -I _1t1 , ΔI _2t2 =I _2t2 -I _2t1 , ΔI _3t2 =I _3t2 -I _3t1 , ΔI _4t2 =I _4t2 -I _4t1 , ΔI _1t3 =I _1t3 -I _1t1 , ΔI _2t3 =I _2t3 -I _2t1 , ΔI _3t3 =I _3t3 -I _3t1 , ΔI _4t3 =I _4t3 -I _4t1 .

In an embodiment of the present invention, the above computing unit zooms in, zooms out or rotates the object according to the first touch position, the second touch position and the third touch position.

In the above-mentioned embodiments of the present invention, the surface capacitive touch panel calculates the first touch position according to the current flowing through its four electrodes at the first time point, and calculates the first touch position according to the period from the first time point to the second time point. The second touch position is calculated by the variation of the current flowing through the four electrodes, so that the surface capacitive touch panel has a multi-touch function.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, a number of embodiments will be described below in detail with reference to the accompanying drawings.

Description of drawings

1 is a schematic diagram of a surface capacitive touch panel according to an embodiment of the present invention;

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

FIG. 3 is a functional block diagram of the surface capacitive touch panel of FIG. 1;

FIG. 4 is used to illustrate the situation of the surface capacitive touch panel in FIG. 1 when the panel body is not touched;

FIG. 5 is used to illustrate the situation of the surface capacitive touch panel in FIG. 1 when the panel body is touched by a finger of the user;

FIG. 6 is used to illustrate the situation of the surface capacitive touch panel in FIG. 1 when the panel body is touched by two fingers of the user;

Fig. 7 depicts the changes of the user's two fingers when the object is enlarged;

Fig. 8 depicts the changes of the user's two fingers when the object is zoomed out;

FIG. 9 illustrates the changes of the user's two fingers when the object is rotated.

Detailed ways

The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment in conjunction with the accompanying drawings. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front or back, etc., are only referring to the directions of the drawings. Accordingly, the directional terms are used to illustrate and not to limit the invention.

The technical principle of the surface capacitive touch panel is to provide a voltage at the four corners of a conductive plane (such as indium tin oxide (ITO) film or glass) to make it A uniform electric field is formed. When a human finger touches the conductive plane, current will flow through the finger to generate a signal. The position of the finger touch can be calculated by the current signals at the four corners.

Refer to Figures 1 to 3. 1 is a schematic diagram of a surface capacitive touch panel 100 according to an embodiment of the present invention, FIG. 2 is a top view of a panel body 200 in FIG. 1 , and FIG. 3 is a functional block diagram of the surface capacitive touch panel 100 in FIG. 1 . The surface capacitive touch panel 100 has a driving circuit 110 and a panel body 200 . The panel body 200 has a substrate 202 , a conductive film 204 and a protective film 206 . In an embodiment of the present invention, the material of the substrate 202 is, for example, transparent glass, the material of the conductive film 204 is, for example, indium tin oxide (ITO), and the material of the protective film 206 is, for example, silicon dioxide (silicon dioxide). Dioxide; SiO ₂ ), but the present invention is not limited thereto. A panel capacitance is formed between the substrate 202 and the conductive film 204 , and for convenience, the panel capacitance is denoted as Cp in FIG. 1 . The conductive film 204 is provided with a first electrode 210 , a second electrode 220 , a third electrode 230 and a fourth electrode 240 . As shown in FIG. 2 , in this embodiment, the first electrode 210 , the second electrode 220 , the third electrode 230 and the fourth electrode 240 are respectively disposed at four corners of the panel body 200 . The driving circuit 110 is coupled to the first electrode 210 , the second electrode 220 , the third electrode 230 and the fourth electrode 240 to transmit the first current I ₁ , the second current I ₂ , the third current I ₃ and the fourth current respectively. I ₄ to the first electrode 210 , the second electrode 220 , the third electrode 230 and the fourth electrode 240 . Since the human body is an electric conductor, when the human finger touches the conductive film 204 , it will generate capacitive coupling with the electric field of the conductive film 204 , so the capacitance value of the panel capacitor Cp will change. Due to the change of the capacitance value of the panel capacitance Cp, the first current I ₁ , the second current I ₂ , the third current I ₃ , The fourth current I ₄ will also change accordingly. The driving circuit 110 can calculate the coordinates of the corresponding touch points according to the changes of the first current I ₁ , the second current I ₂ , the third current I ₃ , and the fourth current I ₄ .

The driving circuit 110 has an analog-to-digital converter 112 and an arithmetic unit 114 . The analog-to-digital converter 112 is used to convert the first current I ₁ , the second current I ₂ , the third current I ₃ , and the fourth current I ₄ into the first current value, the second current value, the third current value, and the fourth current value, respectively. Four current values. The computing unit 114 is coupled to the analog-to-digital converter 112, and is used to calculate the corresponding touch control according to the first current value, the second current value, the third current value and the fourth current value output by the analog-to-digital converter 112. Location. In addition, in an embodiment of the present invention, the driving circuit 110 further includes a storage unit 116 for temporarily storing information required by the computing unit 114 . In the following description, the control method of the surface capacitive touch panel 100 will be described with reference to the accompanying drawings.

Referring to FIG. 4 , FIG. 4 is used to illustrate the situation of the surface capacitive touch panel 100 in FIG. 1 when the panel body 200 is not touched. When the panel body 200 is not touched, the first current I ₁ , the second current I ₂ , the third current I ₃ , and the fourth current I ₄ are very small. In this embodiment, the first current I ₁ , the second current I ₂ , the third current I ₃ , and the fourth current I ₄ are respectively 10 microamperes (μA).

，而上述坐标以面板本体200的左上角为其原点。此外，在本发明一实施例中，第一电流值I_1t1、第二电流值I_2t1、第三电流值I_3t1及第四电流值I_4t1会被储存在存储单元116，而作为运算单元114进行后续计算时的依据。Referring to FIG. 5 , FIG. 5 is used to illustrate the situation of the surface capacitive touch panel 100 in FIG. 1 when the panel body 200 is touched by a user's finger. At the first point in time, because a finger of the user touches the panel body 200, the capacitance value of the panel capacitor Cp will change, and cause the first current I ₁ , the second current I ₂ , the third current I ₃ and the fourth current I 2 . The current _I4 changes. As shown in FIG. 5 , the first current I ₁ , the second current I ₂ , the third current I ₃ and the fourth current I ₄ are 300 microamperes, 100 microamperes, 300 microamperes and 100 microamperes respectively. The magnitudes of the first current I ₁ , the second current I ₂ , the third current I ₃ and the fourth current I ₄ are related to the position where the user touches the panel body 200 . In other words, when the position where the user touches the panel body 200 changes, the magnitudes of the first current I ₁ , the second current I ₂ , the third current I ₃ and the fourth current I ₄ will change accordingly. The analog-to-digital converter 112 converts the first current I ₁ , the second current I ₂ , the third current I ₃ and the fourth current I ₄ into the first current value, the second current value, the third current value and the fourth current value respectively. current value. Taking FIG. 5 as an example, at the first time point, the first current value, the second current value, the third current value and the fourth current value are I _1t1 , I _2t1 , I _3t1 and I _4t1 respectively. The calculation unit 114 calculates the coordinates of the first touch position A according to the current value converted by the analog-to-digital converter 112 as

, and the above coordinates take the upper left corner of the panel body 200 as its origin. In addition, in an embodiment of the present invention, the first current value I _1t1 , the second current value I _2t1 , the third current value I _3t1 and the fourth current value I _4t1 are stored in the storage unit 116 as the operation unit 114 The basis for subsequent calculations.

Referring to FIG. 6 , FIG. 6 is used to illustrate the situation of the surface capacitive touch panel 100 in FIG. 1 when the panel body 200 is touched by two fingers of the user. At the second time point, because another finger of the user touches the second touch position B of the panel body 200 , the capacitance value of the panel capacitor Cp changes, resulting in the first current I ₁ and the second current I ₂ , the third current I ₃ and the fourth current I ₄ change. As shown in FIG. 6 , the first current I ₁ , the second current I ₂ , the third current I ₃ and the fourth current I ₄ are all 400 microamperes. It is worth noting that the magnitudes of the first current I ₁ , the second current I ₂ , the third current I ₃ and the fourth current I ₄ are the same as those of the first touch position A and the second touch position B on the panel body 200 The coordinates are related, and the values of the above currents are only for illustrative purposes, and the present invention should not be limited thereto.

At the second time point, the analog-to-digital converter 112 will also convert the first current I ₁ , the second current I ₂ , the third current I ₃ and the fourth current I ₄ into the first current value, the second current value, The third current value and the fourth current value. Taking FIG. 6 as an example, at the second time point, the first current value, the second current value, the third current value and the fourth current value are I _1t2 , I _2t2 , I _3t2 and I _4t2 respectively. The calculation unit 114 calculates the coordinates of the second touch position B according to the variation of the first current value, the second current value, the third current value and the fourth current value during the period from the first time point to the second time point as $(\frac{{\mathrm{\ΔI}}_{2t2}+{\mathrm{\ΔI}}_{4t2}}{{\mathrm{\ΔI}}_{1t2}+{\mathrm{\ΔI}}_{2t2}+{\mathrm{\ΔI}}_{3t2}+{\mathrm{\ΔI}}_{4t2}},\frac{{\mathrm{\ΔI}}_{3t2}+{\mathrm{\ΔI}}_{4t2}}{{\mathrm{\ΔI}}_{1t2}+{\mathrm{\ΔI}}_{2t2}+{\mathrm{\ΔI}}_{3t2}+{\mathrm{\ΔI}}_{4t2}})$ , where ΔI _1t2 =I _1t2 -I _1t1 , ΔI _2t2 =I _2t2 -I _2t1 , ΔI _3t2 =I _3t2 -I _3t1 , ΔI _4t2 =I _4t2 -I _4t1 .

，其中ΔI_1t3＝I_1t3-I_1t1、ΔI_2t3＝I_2t3-I_2t1、ΔI_3t3＝I_3t3-I_3t1、ΔI_4t3＝I_4t3-I_4t1。之后，运算单元114进一步地依据第一触控位置A、第二触控位置B和第三触控位置B’的坐标，判断使用者的两个手指在第二时间点至第三时间点的期间的变化情形，以控制上述对象的动作。以图7为例，因在第二时间点至第三时间点的期间，使用者两个手指之间的水平距离增大了而垂直距离大致上没有变化，故运算单元114会产生对应的控制信号，以放大对象。The user can zoom in, zoom out or rotate the object by moving the finger on the second touch position B. Wherein, the above-mentioned object is, for example, a picture or a window on a computer screen. Referring to FIG. 6 and FIG. 7 , wherein FIG. 7 illustrates changes of the user's two fingers when the object is enlarged. At the third time point, the user's finger moves from the second touch position B to the third touch position B′. At this time, the first current value, the second current value, the third current value and the fourth current value are I _1t3 , I _2t3 , I _3t3 and I _4t3 respectively. The calculation unit 114 calculates the coordinates of the third touch position B′ according to the variation of the first current value, the second current value, the third current value and the fourth current value during the period from the first time point to the third time point for

, where ΔI _1t3 =I _1t3 -I _1t1 , ΔI _2t3 =I _2t3 -I _2t1 , ΔI _3t3 =I _3t3 -I _3t1 , ΔI _4t3 =I _4t3 -I _4t1 . Afterwards, the computing unit 114 further determines the position of the user's two fingers from the second time point to the third time point according to the coordinates of the first touch position A, the second touch position B and the third touch position B'. During the changing situation, to control the actions of the above objects. Taking FIG. 7 as an example, since the horizontal distance between the two fingers of the user increases while the vertical distance remains substantially unchanged during the period from the second time point to the third time point, the computing unit 114 will generate a corresponding control signal to magnify the object.

In addition to zooming in on the object, you can also zoom out and rotate the object. Referring to FIG. 8 , FIG. 8 illustrates changes of the user's two fingers when the object is zoomed out. Likewise, at the third time point, the user's finger moves from the second touch position B to the third touch position B'. During the period from the second time point to the third time point, the horizontal distance between the two fingers of the user is reduced while the vertical distance is substantially unchanged, so the computing unit 114 generates a corresponding control signal to shrink the object.

Referring to FIG. 9 , FIG. 9 illustrates changes of the user's two fingers when the object is rotated. Likewise, at the third time point, the user's finger moves from the second touch position B to the third touch position B'. Since the trajectory of the finger from the second touch position B to the third touch position B′ is approximately arc-shaped during the period from the second time point to the third time point, the computing unit 114 will generate a corresponding control signal to sequentially Rotates the object clockwise.

To sum up, the above-mentioned embodiments of the present invention have at least one of the following advantages: the surface capacitive touch panel calculates the first touch position according to the current flowing through its four electrodes at the first time point, and The second touch position is calculated according to the variation of the current flowing through the four electrodes during the period from the first time point to the second time point, so that the surface capacitive touch panel has a multi-touch function. In addition, as the touch position of the user changes, the calculation unit of the surface capacitive touch panel will generate a corresponding control signal to zoom in, zoom out or rotate the object.

The above is only a preferred embodiment of the present invention, and should not limit the scope of the present invention with this, that is, all simple equivalent changes and modifications made according to the claims of the present invention and the content of the description of the invention still belong to this invention. within the scope of invention patents. In addition, any embodiment of the present invention or the scope of claims does not necessarily achieve all the objects or advantages or features disclosed in the present invention. In addition, the abstract and the title are only used to assist in the search of patent documents, and are not used to limit the scope of rights 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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