CN102999243B - Detection method and detection device of resistance-type touch screen - Google Patents

Abstract

The invention provides a detection method and a detection device of a resistance touch screen. In order to obtain an oblique angle of a joint line between two points, firstly based on the voltage detection before the touching and after the two-point touching, a resistance variation quantity ratio of a Y plane relative to an X plane is calculated; and then the oblique angle is calculated according to a correspondence relation between the oblique angle and the resistance variation quantity. In order to obtain a distance between two points, firstly the resistance variation quantity ratio and a first ratio value of the resistance variation quantity of any plane of the X plane and the Y plane relative to a total resistance of any plane are calculated; then a second ratio value of an equivalent contact resistance in the middle point relative to the total resistance of any plane is calculated; and finally the distance between two points can be calculated according to the correspondence relation among the resistance variation quantity ratio, the first ratio value, the second ratio value and the two-point distance. Furthermore, a coordinate of the two points also can be calculated.

Description

The detection method of resistive touch screen and device

Technical field

The present invention relates to touch-screen detection technique, be particularly applicable to detection method and the device of the resistive touch screen that two point touches.

Background technology

Touch-screen (Touch panel) is also called touch panel, is a kind of induction type liquid crystal indicator.When such as contact, finger tip etc. press touch-screen in the position that touch-screen shows a certain prompting figure, touch-screen can sense the touch point pressed, and substitutes various mechanical operation with the position, touch point sensed or change in location trend.

Resistive touch screen is a kind of comparatively conventional touch-screen.Resistive touch screen usually has indium tin oxide semiconductor (ITO) layer of two homogeneous conductive, also referred to as resistive film, utilizes medium to isolate and support between two ITO.Two ITO layer are respectively to being applied to the X-direction coordinate and Y-direction coordinate that represent position, touch point, therefore two ITO layer are called again X plane and Y plane.

After generation single-point touches, X plane contacts unique touch point with Y plane.Now, the X-direction coordinate of touch point and the position of Y-direction coordinate, i.e. touch point can be detected based on voltage divider principle, thus the single-point can determined with position touch alternative as clicked, the mechanical mouse action such as double-click.In addition, by the position in not detected touch point in the same time, the change in location trend of touch point can also be obtained, thus the single-point can determined with change in location trend touches operations such as realizing such as dragging, roll screen.

When after generation two touch, X plane and Y plane contact at 2.Now, be merely able to obtain the X-direction coordinate of the mid point between two touch points and the position of Y-direction coordinate, i.e. mid point based on voltage divider principle.Therefore, for the situation of two touch, existing detection method only by estimating that the length variation tendency of distance between two points determines the relative position variation tendency between 2, thus can realize with relative position variation tendency operations such as such as amplifying, reduce.

But existing detection method cannot obtain the actual coordinate of the angle of inclination of 2 lines, the concrete size of 2 distances and at 2.Thus, just cannot realize according to the angle of inclination of 2 lines operations such as such as rotating, also the accurate scaling of operations such as such as amplifying, reduce cannot be determined according to the concrete size of 2 distances, the combination that more such as cannot click according to the actual coordinate realization of 2, double-click, drag, roll screen etc. operates.

Similarly, based on the pick-up unit identical with above-mentioned detection method principle in prior art, the angle of inclination of 2 lines, the concrete size of 2 distances and the actual coordinate of 2 also cannot be obtained.

Summary of the invention

In view of this, the invention provides detection method and the device of resistive touch screen, the angle of inclination of 2 lines, 2 distances can be detected and detect the actual coordinate of 2 further.

The invention provides a kind of detection method of resistive touch screen, this detection method comprises:

Step a1, based on when not occurring to touch and the voltage detecting after two touch occurs, calculate the ratio of Y plane compared to the resistance change of X plane; Wherein, the ratio of described resistance change is directly proportional to the ratio of described Y plane compared to the voltage variety of described X plane;

The angle of inclination of 2 lines that step a2, foundation pre-set and the corresponding relation of the ratio of described resistance change, calculate described angle of inclination.

Alternatively:

Described step a1 based on described voltage detecting be by applying current excitation respectively and detect described X plane to realize with the terminal voltage that described Y plane is connected current source with described Y plane to described X plane; And the ratio of the described resistance change that described step a1 calculates equals the ratio of described Y plane compared to the voltage variety of described X plane;

Or, described step a1 based on described voltage detecting be by connect respectively at the two ends of described X plane and described Y plane or only one end series connection outer meeting resistance two ends after series connection apply voltage drive and the both end voltage difference that detects described X plane and described Y plane realizes; And the ratio of the described resistance change that described step a1 calculates equals the ratio of described Y plane compared to the voltage variety of described X plane and the product of the preset ratio factor.

Preferably, described corresponding relation is

Wherein, k _xyfor the scale-up factor between described Y plane and described X plane, θ is be benchmark with the X-direction corresponding to described X plane described angle of inclination, Δ R _yfor the resistance change of described Y plane, Δ R _xfor the resistance change of described X plane.

The invention provides the detection method of another kind of resistive touch screen, this detection method comprises:

Step b1, based on when not occurring to touch and the voltage detecting after two touch occurs, calculate the resistance change of Y plane compared to any plane in the ratio of the resistance change of X plane and described X plane and described Y plane compared to the first ratio of the all-in resistance of described any plane; Wherein, the ratio of described resistance change is directly proportional to the ratio of described Y plane compared to the voltage variety of described X plane, and described first ratio is directly proportional compared to the ratio that voltage when touching is not occurring described any plane to the voltage variety of described any plane;

Step b2, based on after generation two touch contact resistance detect, calculate second ratio of equivalent contact resistance compared to the all-in resistance of described any plane of the midpoint of point-to-point transmission; Wherein, described contact resistance detects and is based on contact resistance compared to the electric resistance partial pressure ratio of described any plane and the coordinate of described mid point in described any plane, and described second ratio equals described electric resistance partial pressure ratio and described mid point to the product of the ration of division of the all-in resistance of described any plane;

Simultaneous relation between step b3, the ratio according to described resistance change, described first ratio, described second ratio and 2 distances, calculates described 2 distances; Wherein, described simultaneous relation is according to value relatable after generation two touch of described X plane and described Y plane and sets up in advance based on the corresponding relation of the angle of inclination of 2 lines with the ratio of described resistance change.

Alternatively:

Described step b1 based on described voltage detecting be by applying current excitation respectively and detect described X plane to realize with the terminal voltage that described Y plane is connected current source with described Y plane to described X plane, and the ratio of the described resistance change that described step b1 calculates equals voltage variety that described Y plane equals described any plane compared to the ratio of the voltage variety of described X plane, described first ratio compared to described any plane at the ratio that voltage when touching does not occur;

Or, described step b1 based on described voltage detecting be by connect respectively at the two ends of described X plane and described Y plane or only one end series connection outer meeting resistance and in series connection after two ends apply voltage drive, and the both end voltage difference that detects described X plane and described Y plane realizes, and, the ratio of the described resistance change that described step b1 calculates equals the ratio of described Y plane compared to the voltage variety of described X plane and the product of default first scale factor, described first ratio equals the voltage variety of described any plane compared to the product of described any plane at ratio with default second scale factor that voltage when touching does not occur.

Alternatively, described step b2 based on be by applying voltage drive in one end of one end of described any plane and another plane and with the other end of the other end of described any plane and another plane described for voltage detecting point realizes to the detection of described electric resistance partial pressure ratio, and, the described electric resistance partial pressure ratio that described step b2 obtains is the dividing ratios of described contact resistance compared to one section of resistance in described any plane, described one section of resistance from described one end of described any plane in described 2 wherein.

Preferably, described any plane is described X plane, and the described simultaneous relation of described step b3 institute foundation comprises:

$x_{2,\mathrm{ratio}}=\frac{(1+\sqrt{{\mathrm{\ΔR}}_y/{\mathrm{\ΔR}}_x})\frac{{\mathrm{\ΔR}}_x}{R_{x,\mathrm{tot}}}+\sqrt{{(1+\sqrt{{\mathrm{\ΔR}}_y/{\mathrm{\ΔR}}_x})}^2{\left(\frac{{\mathrm{\ΔR}}_x}{R_{x,\mathrm{tot}}}\right)}^2+8\frac{{\mathrm{\ΔR}}_x}{R_{x,\mathrm{tot}}}{z}_{\mathrm{ratio}}}}{2};$

$z_{\mathrm{ratio}}=\frac{R_{\mathrm{touch}}}{R_{x,\mathrm{tot}}}+\sqrt{{\left(\frac{R_{\mathrm{touch}}}{R_{x,\mathrm{tot}}}\right)}^2+\frac{R_{\mathrm{touch}}}{R_{x,\mathrm{tot}}}(1+\sqrt{{\mathrm{\ΔR}}_y/{\mathrm{\ΔR}}_x})[1-\frac{x_{2,\mathrm{ratio}}}{2D\left(x_{\mathrm{mid}}\right)}]x_{2,\mathrm{ratio}}}$ Or $z_{\mathrm{ratio}}=2\frac{R_{\mathrm{touch}}}{R_{x,\mathrm{tot}}};$

$k_{\mathrm{xy}}\tan \mathrm{\θ}=\sqrt{{\mathrm{\ΔR}}_y/{\mathrm{\ΔR}}_x};$

y _2，ratio＝x _2，ratiotanθ/k _xy；

Wherein, x _{2, ratio}for described 2 distances after normalization in described X plane; Δ R _yfor the resistance change of described Y plane, Δ R _xfor the resistance change of described X plane, R _{x, tot}for the all-in resistance of described X plane, Δ R _y/ Δ R _xfor the ratio of described resistance change, for described first ratio; z _ratiofor the described contact resistance at each touch point place is compared to the ratio of the all-in resistance of described X plane; R _touchfor described equivalent contact resistance, for described second ratio; D (x _mid) for mid point is to the all-in resistance R of X plane _{x, tot}the ration of division; for described corresponding relation, k _xyfor the scale-up factor between described Y plane and described X plane, θ is the described angle of inclination that is benchmark with the X-direction corresponding to described X plane; y _{2, ratio}for described 2 distances after normalization in described Y plane.

Further, this detection method comprises further:

Step b4, according to the voltage relationship between described X plane and the two ends of described Y plane, judge obtain described point-to-point transmission line quadrant trend; Wherein, described quadrant trend is determined by the positive negative direction of another both end voltage difference after the both end voltage relation of one of them of described X plane and described Y plane is determined;

Step b5, according to described 2 distances in coordinate in described X plane and described Y plane of described quadrant trend, described mid point and described X plane and described Y plane, calculate described 2 coordinates in described X plane and described Y plane; Wherein, described 2 to be respectively at the coordinate of described X plane that described mid point adds at the coordinate of described X plane, the half of described 2 distances subtracted in described X plane, described 2 to be respectively at the coordinate of described Y plane that described mid point adds at the coordinate of described Y plane, the half of described 2 distances subtracted in described Y plane, described in add, described 2 coordinates compared to described mid point subtracted represented by described quadrant moves towards increase and decrease relation and determine.

The invention provides a kind of pick-up unit of resistive touch screen, this pick-up unit comprises:

Resistance variations detection module, based on voltage detecting when not occurring to touch and after generation two touch, calculates the ratio of Y plane compared to the resistance change of X plane; Wherein, the ratio of described resistance change is directly proportional to the ratio of described Y plane compared to the voltage variety of described X plane;

Angle of inclination computing module, according to the angle of inclination of 2 lines pre-set and the corresponding relation of the ratio of described resistance change, calculates described angle of inclination.

Alternatively:

Described resistance variations detection module based on described voltage detecting be by applying current excitation respectively and detect described X plane to realize with the terminal voltage that described Y plane is connected current source with described Y plane to described X plane; And the ratio of the described resistance change that described resistance variations detection module calculates equals the ratio of described Y plane compared to the voltage variety of described X plane;

Or, described resistance variations detection module based on described voltage detecting be by connect respectively at the two ends of described X plane and described Y plane or only one end series connection outer meeting resistance two ends after series connection apply voltage drive and the both end voltage difference that detects described X plane and described Y plane realizes; And the ratio of the described resistance change that described resistance variations detection module calculates equals the ratio of described Y plane compared to the voltage variety of described X plane and the product of the preset ratio factor.

Preferably, described corresponding relation is

Wherein, k _xyfor the scale-up factor between described Y plane and described X plane, θ is be benchmark with the X-direction corresponding to described X plane described angle of inclination, Δ R _yfor the resistance change of described Y plane, Δ R _xfor the resistance change of described X plane.

The invention provides a kind of pick-up unit of resistive touch screen, this pick-up unit comprises:

Resistance variations detection module, based on when not occurring to touch and the voltage detecting after two touch occurs, calculate the resistance change of Y plane compared to any plane in the ratio of the resistance change of X plane and described X plane and described Y plane compared to the first ratio of the all-in resistance of described any plane; Wherein, the ratio of described resistance change is directly proportional to the ratio of described Y plane compared to the voltage variety of described X plane, and described first ratio is directly proportional compared to the ratio that voltage when touching is not occurring described any plane to the voltage variety of described any plane;

Contact resistance detection module, detects based on the contact resistance after generation two touch, calculates second ratio of equivalent contact resistance compared to the all-in resistance of described any plane of the midpoint of point-to-point transmission; Wherein, described contact resistance detects and is based on contact resistance compared to the electric resistance partial pressure ratio of described any plane and the coordinate of described mid point in described any plane, and described second ratio equals described electric resistance partial pressure ratio and described mid point to the product of the ration of division of the all-in resistance of described any plane;

2 distance calculation module, according to the simultaneous relation between the ratio of described resistance change, described first ratio, described second ratio and 2 distances, calculate described 2 distances; Wherein, described simultaneous relation is according to value relatable after generation two touch of described X plane and described Y plane and sets up in advance based on the corresponding relation of the angle of inclination of 2 lines with the ratio of described resistance change.

Alternatively:

Described resistance variations detection module based on described voltage detecting be by applying current excitation respectively and detect described X plane to realize with the terminal voltage that described Y plane is connected current source with described Y plane to described X plane, and the ratio of the described resistance change that described resistance variations detection module calculates equals voltage variety that described Y plane equals described any plane compared to the ratio of the voltage variety of described X plane, described first ratio compared to described any plane at the ratio that voltage when touching does not occur;

Or, described resistance variations detection module based on described voltage detecting be by connect respectively at the two ends of described X plane and described Y plane or only one end series connection outer meeting resistance and in series connection after two ends apply voltage drive, and the both end voltage difference that detects described X plane and described Y plane realizes, and, the ratio of the described resistance change that described resistance variations detection module calculates equals the ratio of described Y plane compared to the voltage variety of described X plane and the product of default first scale factor, described first ratio equals the voltage variety of described any plane compared to the product of described any plane at ratio with default second scale factor that voltage when touching does not occur.

Alternatively, described contact resistance detection module based on be by applying voltage drive in one end of one end of described any plane and another plane and with the other end of the other end of described any plane and another plane described for voltage detecting point realizes to the detection of described electric resistance partial pressure ratio, and, the described electric resistance partial pressure ratio that described contact resistance detection module obtains is the dividing ratios of described contact resistance compared to one section of resistance in described any plane, described one section of resistance from described one end of described any plane in described 2 wherein.

Preferably, described any plane is described X plane, and the described simultaneous relation of described 2 distance calculation module institute foundations comprises:

$x_{2,\mathrm{ratio}}=\frac{(1+\sqrt{{\mathrm{\ΔR}}_y/{\mathrm{\ΔR}}_x})\frac{{\mathrm{\ΔR}}_x}{R_{x,\mathrm{tot}}}+\sqrt{{(1+\sqrt{{\mathrm{\ΔR}}_y/{\mathrm{\ΔR}}_x})}^2{\left(\frac{{\mathrm{\ΔR}}_x}{R_{x,\mathrm{tot}}}\right)}^2+8\frac{{\mathrm{\ΔR}}_x}{R_{x,\mathrm{tot}}}{z}_{\mathrm{ratio}}}}{2};$

$z_{\mathrm{ratio}}=\frac{R_{\mathrm{touch}}}{R_{x,\mathrm{tot}}}+\sqrt{{\left(\frac{R_{\mathrm{touch}}}{R_{x,\mathrm{tot}}}\right)}^2+\frac{R_{\mathrm{touch}}}{R_{x,\mathrm{tot}}}(1+\sqrt{{\mathrm{\ΔR}}_y/{\mathrm{\ΔR}}_x})[1-\frac{x_{2,\mathrm{ratio}}}{2D\left(x_{\mathrm{mid}}\right)}]x_{2,\mathrm{ratio}}}$ Or $z_{\mathrm{ratio}}=2\frac{R_{\mathrm{touch}}}{R_{x,\mathrm{tot}}};$

$k_{\mathrm{xy}}\tan \mathrm{\θ}=\sqrt{{\mathrm{\ΔR}}_y/{\mathrm{\ΔR}}_x};$

y _2，ratio＝x _2，ratiotanθ/k _xy；

Wherein, x _{2, ratio}for described 2 distances after normalization in described X plane; Δ R _yfor the resistance change of described Y plane, Δ R _xfor the resistance change of described X plane, R _{x, tot}for the all-in resistance of described X plane, Δ R _y/ Δ R _xfor the ratio of described resistance change, for described first ratio; z _ratiofor the described contact resistance at each touch point place is compared to the ratio of the all-in resistance of described X plane; R _touchfor described equivalent contact resistance, for described second ratio; D (x _mid) for mid point is to the all-in resistance R of X plane _{x, tot}the ration of division; for described corresponding relation, k _xyfor the scale-up factor between described Y plane and described X plane, θ is the described angle of inclination that is benchmark with the X-direction corresponding to described X plane; y _{2, ratio}for described 2 distances after normalization in described Y plane.

Further, this pick-up unit comprises further:

Quadrant moves towards judge module, according to the voltage relationship between described X plane and the two ends of described Y plane, judges the quadrant trend obtaining described point-to-point transmission line; Wherein, described quadrant trend is determined by the positive negative direction of another both end voltage difference after the both end voltage relation of one of them of described X plane and described Y plane is determined;

Two point coordinate computing modules, according to described 2 distances in coordinate in described X plane and described Y plane of described quadrant trend, described mid point and described X plane and described Y plane, calculate described 2 coordinates in described X plane and described Y plane; Wherein, described 2 to be respectively at the coordinate of described X plane that described mid point adds at the coordinate of described X plane, the half of described 2 distances subtracted in described X plane, described 2 to be respectively at the coordinate of described Y plane that described mid point adds at the coordinate of described Y plane, the half of described 2 distances subtracted in described Y plane, described in add, described 2 coordinates compared to described mid point subtracted represented by described quadrant moves towards increase and decrease relation and determine.

As above visible:

The present invention can obtain Y plane based on voltage detecting and calculate angle of inclination compared to the ratio of the resistance change of X plane and according to angle of inclination with the corresponding relation of the ratio of resistance change;

And, the present invention can also set up out according to X plane and the value relatable of Y plane after generation two touch the simultaneous relation including distance between two points based on angle of inclination with the corresponding relation of the ratio of resistance change, therefore, using the ratio of the resistance change that detects, the first ratio, the second ratio as the known variables in simultaneous relation, the occurrence of distance between two points can be calculated according to this simultaneous relation.

Further alternatively, the present invention can also judge the quadrant trend of point-to-point transmission line, now, according to quadrant trend and the coordinate of mid point detected and 2 distances calculated, can obtain the actual coordinate of 2.

Accompanying drawing explanation

Fig. 1 is a kind of exemplary flow schematic diagram of the detection method of the resistive touch screen being applicable to two touch in the specific embodiment of the invention;

Fig. 2 is the another kind of exemplary flow schematic diagram of the detection method of the resistive touch screen being applicable to two touch in the specific embodiment of the invention;

Fig. 3 is that the detection method of the resistive touch screen being applicable to two touch in the specific embodiment of the invention is based on the exemplary flow schematic diagram after the expansion of flow process as shown in Figure 2;

Fig. 4 in the specific embodiment of the invention for the sensitivity analysis chart that two touch provide;

Fig. 5 a and Fig. 5 b is the schematic diagram of two kinds of equivalent resistance networks of sensitivity as shown in Figure 4;

Fig. 6 a and Fig. 6 b is the schematic diagram of a kind of change in voltage detection mode adopted in the specific embodiment of the invention;

Fig. 7 a and Fig. 7 b is the schematic diagram of the another kind of change in voltage detection mode adopted in the specific embodiment of the invention;

Fig. 8 is based on a kind of current direction analysis chart that value relatable as shown in Figure 4 produces in the specific embodiment of the invention;

Fig. 9 is the schematic diagram of the dividing potential drop relation detection mode adopted in the specific embodiment of the invention;

Figure 10 a and Figure 10 b is the schematic diagram of the mid point coordinate measurement mode adopted in the specific embodiment of the invention;

Figure 11 a and Figure 11 b is the principle schematic diagram judging in the specific embodiment of the invention that quadrant moves towards;

Figure 12 is a kind of example arrangement schematic diagram of the pick-up unit of the resistive touch screen being applicable to two touch in the specific embodiment of the invention;

Figure 13 is the another kind of example arrangement schematic diagram of the pick-up unit of the resistive touch screen being applicable to two touch in the specific embodiment of the invention;

Figure 14 is that the pick-up unit of the resistive touch screen being applicable to two touch in the specific embodiment of the invention is based on the example arrangement schematic diagram after structure extension as shown in figure 13.

Embodiment

For making object of the present invention, technical scheme and advantage clearly understand, to develop simultaneously embodiment referring to accompanying drawing, the present invention is described in more detail.

Fig. 1 is a kind of exemplary flow schematic diagram of the detection method of the resistive touch screen being applicable to two touch in the specific embodiment of the invention.As shown in Figure 1, this detection method comprises:

Step 101, based on when not occurring to touch and the voltage detecting occurred to X plane and Y plane two ends after two touch (how judging whether that generation two touch can utilize existing mode to realize, repeat no more herein), calculate the ratio of Y plane compared to the resistance change of X plane.

Wherein, the ratio of the resistance change calculated in this step is directly proportional to the ratio of Y plane compared to the voltage variety of X plane.

Step 102, according to the angle of inclination of 2 lines pre-set and the corresponding relation of the ratio of resistance change, calculates the angle of inclination of 2 lines.

So far, flow process as shown in Figure 1 terminates.

Based on above-mentioned flow process, owing to establishing the corresponding relation of angle of inclination and the ratio of resistance change in advance, therefore, as long as carry out detecting the ratio that can obtain resistance change and then the angle of inclination that also just can obtain 2 lines to the voltage be directly proportional to resistance.

Fig. 2 is the another kind of exemplary flow schematic diagram of the detection method of the resistive touch screen being applicable to two touch in the specific embodiment of the invention.As shown in Figure 2, this detection method comprises:

Step 201, based on when not occurring to touch and the voltage detecting occurred to X plane and Y plane two ends after two touch (how judging whether that generation two touch can utilize existing mode to realize, repeat no more herein), calculate the resistance change of Y plane compared to any plane in the ratio of the resistance change of X plane and X plane and Y plane compared to the first ratio of the all-in resistance of this any plane.

Wherein, the ratio of the resistance change calculated in this step is directly proportional to the ratio of Y plane compared to the voltage variety of X plane, and the first ratio calculated in this step is directly proportional compared to the ratio that voltage when touching is not occurring above-mentioned any plane to the voltage variety of above-mentioned any plane.

Step 202, detects based on the contact resistance after generation two touch, calculates second ratio of equivalent contact resistance compared to the all-in resistance of this any plane of the midpoint of point-to-point transmission.

Wherein, in this step based on contact resistance detect and be based on contact resistance compared to the electric resistance partial pressure ratio of above-mentioned any plane and the coordinate of mid point in above-mentioned any plane, the second ratio obtained in this step equals above-mentioned electric resistance partial pressure ratio and mid point to the product of the ration of division of the all-in resistance of above-mentioned any plane.

Step 203, according to the simultaneous relation between the ratio of aforementioned resistance change, aforementioned first ratio, aforementioned second ratio and 2 distances, calculates 2 distances in X plane and Y plane.

Wherein, the simultaneous relation of institute's foundation in this step is according to value relatable after generation two touch of X plane and Y plane and set up in advance based on the corresponding relation of angle of inclination with the ratio of resistance change.

So far, flow process as shown in Figure 2 terminates.

Based on above-mentioned flow process, because the simultaneous relation including distance between two points sets up to obtain based on angle of inclination with the corresponding relation of the ratio of resistance change and according to X plane and the value relatable of Y plane after generation two touch, therefore, the second ratio that the ratio of resistance change step 201 obtained and the first ratio and step 202 obtain, as the known variables in simultaneous relation, can calculate the occurrence of distance between two points according to this simultaneous relation.

Fig. 3 is that the detection method of the resistive touch screen being applicable to two touch in the specific embodiment of the invention is based on the exemplary flow schematic diagram after the expansion of flow process as shown in Figure 2.As shown in Figure 3, this detection method comprises step 201 ~ step 203 as shown in Figure 2, also comprises:

Step 204, according to the voltage relationship between X plane and the two ends of Y plane, judges the quadrant trend obtaining described point-to-point transmission line.

Quadrant trend described in this step is determined by the positive negative direction of another both end voltage difference after the both end voltage relation of one of them of X plane and Y plane is determined.

Step 205, according to 2 distances in coordinate in X plane and Y plane of described quadrant trend, mid point and X plane and Y plane, calculates 2 coordinates in X plane and Y plane.

Wherein, this step obtain 2 is respectively at the coordinate of X plane that mid point adds at the coordinate of X plane, the half of 2 distances subtracted in X plane, 2 to be respectively at the coordinate of Y plane that mid point adds at the coordinate of Y plane, the half of 2 distances subtracted in Y plane, described to add, 2 increase and decrease of the coordinates compared to the mid point relations subtracted represented by quadrant moves towards determine.

So far, flow process as shown in Figure 3 terminates.

Based on above-mentioned flow process, owing to can be judged the quadrant trend of point-to-point transmission line by step 204, now, according to quadrant trend and the coordinate of mid point detected and 2 distances calculated, the actual coordinate of 2 can be obtained.

Realize principle and specific implementation for the ease of what understand each step in above-mentioned flow process, first to X plane and Y plane, the basic value relatable after generation two touch carries out brief description.

Fig. 4 in the specific embodiment of the invention for the sensitivity analysis chart that two touch provide.As shown in Figure 4, the terminal at X plane two ends is in the X direction respectively XL and XR, and the terminal at Y plane two ends is in the Y direction respectively YT and YB.When after A point and B point generation two touch:

A point is Ax in the position of X plane, be Ay, B point in the position of Y plane be Bx in the position of X plane, be By in the position of Y plane;

Ax and Bx is by the all-in resistance R of X plane _{x, tot}be divided into the R from XL to Ax _x1, from the R of Ax to Bx _x2, Bx to XR R _x3totally three sections, i.e. R _{x, tot}=R _x1+ R _x2+ R _x3;

Wherein, R _x2be resistance between 2 A and B in X plane, R _x2/ R _{x, tot}be 2 distances in X plane after normalization (hereinafter by the distance R of two after normalization in X plane _x2/ R _{x, tot}referred to as the distance of two in X plane);

Ay and By is by the all-in resistance R of Y plane _{y, tot}be divided into the R from YT to By _y1, from the R of By to Ay _y2, Ay to YB R _y3totally three sections, i.e. R _{y, tot}=R _y1+ R _y2+ R _y3;

Wherein, R _y2be resistance between 2 A and B in Y plane, R _y2/ R _{y, tot}be 2 distances in Y plane after normalization (hereinafter by the distance R of two after normalization in Y plane _y2/ R _{y, tot}referred to as the distance of two in Y plane);

And, be also formed with X plane and the contact resistance R of Y plane at A place, touch point between Ax and Ay _z1, between Bx and By, be also formed with X plane and the contact resistance R of Y plane at B place, touch point _z2.

Again see Fig. 4, between 2 A and B, line is with the angle of inclination that is benchmark of the X-direction corresponding to X plane for θ, also there is the scale-up factor k between Y plane and X plane simultaneously _xy, (x _totfor the total length in X-direction, y _tottotal length in Y-direction) and this known relation.

Therefore, based on above-mentioned known relation, the point-to-point transmission sensitivity that can obtain in X plane and Y plane can be expressed as R _y2=k _xytan θ R _x2.

Fig. 5 a and Fig. 5 b is the schematic diagram of two kinds of equivalent resistance networks of sensitivity as shown in Figure 4.

As shown in Figure 5 a, the XL end from X plane after there are two touch is looked, except there is the R holding sequential series to hold to XR from XL _x1, R _x2, R _x3outside, the path that also existence one is in parallel.The path of this parallel connection is by R _z1, R _y2, R _z2from R _x2be positioned at one end of Ax to R _x2the other end sequential series being positioned at Bx forms.Now, the resistance R of X plane _x=R _x1+ R _x2|| (R _z1+ R _y2+ R _z2)+R _x3, " || " that occur herein all represents parallel relationship.

Visible, the resistance R of X plane after generation two touch _xcompared to the all-in resistance R do not occurred when touching _{x, tot}the variable quantity reduced is: Δ R _x=R _{x, tot}-R _x=R _x2-R _x2|| (R _z1+ R _y2+ R _z2).If again by R _y2=k _xytan θ R _x2substitute into, then can obtain

As shown in Figure 5 b, in like manner can obtain, the resistance R of Y plane after generation two touch _ycompared to the all-in resistance R do not occurred when touching _{y, tot}the variable quantity reduced is:

${\mathrm{\ΔR}}_y=\frac{{R_{y2}}^2}{R_{z1}+R_{z2}+[1+1/\left(k_{\mathrm{xy}}\tan \mathrm{\θ}\right)]R_{y2}}.$

And then, the tilt angle theta that just can obtain 2 lines and resistance change than Δ R _y/ Δ R _xcorresponding relation: $k_{\mathrm{xy}}\tan \mathrm{\θ}=\sqrt{{\mathrm{\ΔR}}_y/{\mathrm{\ΔR}}_x}.$

, then combine the basic value relatable as shown in Fig. 4 and Fig. 5 a and Fig. 5 b below, respectively to each step in the above-mentioned flow process as shown in Figure 1, Figure 2 and shown in Fig. 3 realize principle and preferably implementation be described in detail.

1) about the step 101 in flow process as shown in Figure 1 and the step 201 as shown in Figures 2 and 3 in flow process:

Step 101 and step 201 can be understood as in fact and utilize change in voltage to detect resistance variations, but the resistance variations that step 101 detects not be the occurrence of resistance change but the aforementioned resistance change relevant to resistance change than Δ R _y/ Δ R _x, similarly, the resistance variations that step 201 detects neither the occurrence of resistance change but the aforementioned resistance change relevant to resistance change than Δ R _y/ Δ R _xand aforementioned first ratios delta R _x/ R _{x, tot}or Δ R _y/ R _{y, tot}.

The specific embodiment of the invention is that step 101 and step 201 provide two kinds of detection modes, and one is current excitation mode, another kind is voltage drive mode.

Fig. 6 a and Fig. 6 b is the schematic diagram of a kind of change in voltage detection mode adopted in the specific embodiment of the invention.Current excitation mode refers to Fig. 6 a and Fig. 6 b.

As shown in Figure 6 a, current excitation mode is adopted to X plane, a current source Ib is flowed into from XL end, flows out from XR end.

So, the voltage ADCIN_X that the XL be connected with current source Ib in X plane holds just holds the resistance between holding to XR to be directly proportional for the voltage of X plane that detects to XL.

Thus, if XL end and XR hold between resistance by R _{x, tot}become R _xand produce resistance change Δ R _x, ADCIN_X and resistance change Δ R will be shown as _xthe voltage variety Δ V be directly proportional _{res, x}, this voltage variety Δ V _{res, x}be the voltage variety of X plane when not occurring to touch and after there are two touch, ${\mathrm{\ΔV}}_{\mathrm{res},x}=I_b{\mathrm{\ΔR}}_x=I_b\frac{{R_{x2}}^2}{R_{z1}+R_{z2}+(1+k_{\mathrm{xy}}\tan \mathrm{\θ})R_{x2}}.$

As shown in Figure 6 b, with X plane in like manner, when not occurring to touch and the voltage variety of Y plane after two touch occurs, ${\mathrm{\ΔV}}_{\mathrm{res},y}=I_b{\mathrm{\ΔR}}_y=I_b\frac{{R_{y2}}^2}{R_{z1}+R_{z2}+[1+1/\left(k_{\mathrm{xy}}\tan \mathrm{\θ}\right)]R_{y2}}.$

Thus, Δ R can be obtained _y/ Δ R _x=Δ V _{res, y}/ Δ V _{res, x}, and Δ R _x/ R _{x, tot}=Δ V _{res, x}/ V _{res, x_tot}or Δ R _y/ R _{y, tot}=Δ V _{res, y}/ V _{res, y_tot}, wherein, V _{res, x_tot}be the voltage of the X plane when not occurring to touch, V _{res, y_tot}be the voltage of the Y plane when not occurring to touch.

Visible, if realize voltage detecting by applying current excitation respectively to X plane and Y plane, then the resistance change that calculates of step 101 and step 201 than Δ R _y/ Δ R _xjust equal Y plane compared to X plane voltage variety than Δ V _{res, y}/ Δ V _{res, x}, and, the first ratios delta R that step 201 calculates _x/ R _{x, tot}the voltage variety just equaling X plane compared to X plane do not occur voltage when touching than Δ V _{res, x}/ V _{res, x_tot}, Δ R _y/ R _{y, tot}the voltage variety just equaling Y plane compared to Y plane do not occur voltage when touching than Δ V _{res, y}/ V _{res, y_tot}.

Fig. 7 a and Fig. 7 b is the schematic diagram of the another kind of change in voltage detection mode adopted in the specific embodiment of the invention.Voltage drive mode refers to Fig. 7 a and Fig. 7 b.

As shown in Figure 7a, voltage drive mode is adopted to X plane, can series connection outer meeting resistance R11 be held at XL, hold series connection outer meeting resistance R21 at XR respectively, and positive voltage is encouraged V _bpbe added in one end, negative voltage excitation V that outer meeting resistance R11 does not connect XL end _bnbe added in one end that outer meeting resistance R21 does not connect XR end.

Further, the voltage V of XL end _xLthe voltage V held with XR _xRvoltage difference ADCIN_X, i.e. V _xL-V _xR, be the voltage of the X plane detected.

After generation two touch, voltage difference V _xL-V _xRmeet

Consider R ₁₁+ R ₂₁+ R _x> > Δ R _x, so now just can meet following derivative relation:

$\frac{d\left(\frac{V_{\mathrm{XL}}-V_{\mathrm{XR}}}{V_{\mathrm{bp}}-V_{\mathrm{bn}}}\right)}{d\left(R_x\right)}=\frac{R_{11}+R_{21}}{{(R_{11}+R_{21}+R_x)}^2}\≈\frac{R_{11}+R_{21}}{{(R_{11}+R_{21}+R_{x,\mathrm{tot}})}^2};$

Utilize above-mentioned derivative relation, just can obtain voltage difference V _xL-V _xRvoltage variety Δ (V _xL-V _xR), this voltage variety Δ (V _xL-V _xR) be when not occurring to touch and the voltage variety of X plane after two touch occurs, $\mathrm{\Δ}(V_{\mathrm{XL}}-V_{\mathrm{XR}})\≈\frac{R_{11}+R_{21}}{{(R_{11}+R_{21}+R_{x,\mathrm{tot}})}^2}(V_{\mathrm{bp}}-V_{\mathrm{bn}}){\mathrm{\ΔR}}_x.$

As shown in Figure 7b, with X plane in like manner, voltage drive mode is adopted to Y plane, can series connection outer meeting resistance R12 be held at YT, hold series connection outer meeting resistance R22 at YB respectively, and positive voltage is encouraged V _bpone end, the negative voltage excitation V of YT end is not connected at outer meeting resistance R12 _bnbe added in one end that outer meeting resistance R22 does not connect YB end.Further, the voltage V of YT end _yTthe voltage V held with YB _yBbetween voltage difference ADCIN_Y, i.e. V _yT-V _yB, be the voltage of the Y plane detected.

After generation two touch, voltage difference V _yT-V _yBmeet utilize derivative relation equally, when can not occurred to touch and the voltage variety of Y plane after two touch occurs, $\mathrm{\Δ}(V_{\mathrm{YT}}-V_{\mathrm{YB}})\≈\frac{R_{12}+R_{22}}{{(R_{12}+R_{22}+R_{y,\mathrm{tot}})}^2}(V_{\mathrm{bp}}-V_{\mathrm{bn}}){\mathrm{\ΔR}}_y.$

Thus, Δ R is expressed as with X plane for benchmark (any plane is X plane) with the first ratio _x/ R _{x, tot}for example, can obtain:

${\mathrm{\ΔR}}_y/{\mathrm{\ΔR}}_x=\frac{R_{11}+R_{21}}{R_{12}+R_{22}}{\left(\frac{R_{12}+R_{22}+R_{y,\mathrm{tot}}}{R_{11}+R_{21}+R_{x,\mathrm{tot}}}\right)}^2\frac{\mathrm{\Δ}(V_{\mathrm{YT}}-V_{\mathrm{YB}})}{\mathrm{\Δ}(V_{\mathrm{XL}}-V_{\mathrm{XR}})};$

And, wherein, (V _xL-V _xR) _totbe the voltage of the X plane when not occurring to touch, (V _xL-V _xR) _totmeet

Δ R is expressed as with X plane for benchmark with the first ratio above-mentioned _x/ R _{x, tot}for in the expression formula of example, can be regarded as resistance change than Δ R _y/ Δ R _xwith the ratio of Y plane compared to the voltage variety of X plane between the first scale factor, can be regarded as the first ratio with the voltage variety of X plane compared to X plane there is not the ratio of voltage when touching between the second scale factor.

In addition, above Fig. 7 a and Fig. 7 b is the two ends series connection outer meeting resistance with X plane and Y plane respectively, but outer meeting resistance of also can only at one end connecting in practical application.

2) about the step 202 in flow process as shown in Figures 2 and 3:

The follow-up simultaneous relation for calculating the distance between two points between A and B of touch point, is that the value relatable after generation two touch is set up according to X plane and Y plane, and inevitably relates to the contact resistance R at A place, touch point in this value relatable _z1, and the contact resistance R at B place, touch point _z2.

But, consider the contact resistance R at A place, touch point _z1, and the contact R at B place, touch point _z2not easily be detected, thus step 202 is exactly in fact the equivalent contact resistance R by measuring the midpoint between 2 _touchrelevant ratio is used as known variables when simultaneous relation solves.

As previously mentioned, in order to obtain the equivalent contact resistance R of the midpoint between 2 _touch, need the contact resistance R of any one position in detected touch point A and B _z1or R _z2compared to the R of the all-in resistance of any plane in X plane and Y plane _{x, tot}or R _{y, tot}electric resistance partial pressure ratio and 2 A and B between the coordinate of mid point in X plane and Y plane in any plane.

Fig. 8 is based on a kind of current direction analysis chart that value relatable as shown in Figure 4 produces in the specific embodiment of the invention.Fig. 9 is the schematic diagram of the dividing potential drop relation detection mode adopted in the specific embodiment of the invention.That detects above-mentioned electric resistance partial pressure ratio realizes principle and mode as shown in Figure 8 and Figure 9.

As shown in Figure 8 and Figure 9, with the contact resistance R at detected touch point A place _z1compared to being example from XR end to the electric resistance partial pressure ratio of one section of resistance of Ax in X plane:

Positive voltage excitation V _bpbe added in the YT end of Y plane, negative voltage excitation V _bnbe added in the XR end of X plane, now, have two paths at the electric current of X plane and Y plane flow, Path1 and Path2 namely in Fig. 7 shown by dashed curve arrow;

Wherein, the resistance that Path1 flows through is followed successively by the resistance R that YT holds By _y1, By to Bx R _z2the R of Rz2, Bx to XR end _x3; The resistance that Path2 flows through is followed successively by the R that YT holds Ay _y1and R _y2, Ay to Ax R _z1, Ax to XR end R _x2and R _x3;

In addition, XL end is held as the second check point Zsense2 as first check point Zsense1, YB.

With D (z _sen1) represent that the magnitude of voltage detected at the first check point Zsense1 is compared to V _bp-V _bndigital voltage ratio, with D (z _sen2) represent that the magnitude of voltage detected at the second check point Zsense2 is compared to V _bp-V _bndigital voltage ratio.

So, obtain $\frac{D\left(z_{\mathrm{sen}2}\right)-D\left(z_{\mathrm{sen}1}\right)}{D\left(z_{\mathrm{sen}1}\right)}=D\left(z_{\mathrm{sen}2}\right)/D\left(z_{\mathrm{sen}1}\right)-1$ Be exactly the contact resistance R at A place, touch point _z1the electric resistance partial pressure ratio to one section of resistance of Ax is held from XR compared in X plane.

Based on a kind of mode that such as Fig. 8 and Fig. 9 provides, those skilled in the art can derive other possible electric resistance partial pressure ratio and derive corresponding voltage drive and apply mode, thus will not enumerate herein.

Visible, the detection of step 202 pair electric resistance partial pressure ratio can be apply voltage drive by one end of the one end of any plane in X plane and Y plane and another plane and with the other end of the other end of this any plane and this another plane for voltage detecting point realizes.The electric resistance partial pressure ratio obtained thus is just contact resistance R _z1or R _z2compared to the dividing ratios of one section of resistance in this any plane, one section of described resistance from one end of this any plane to contact resistance R _z1corresponding A point or R _z2corresponding B point.

Figure 10 a and Figure 10 b is the schematic diagram of the mid point coordinate measurement mode adopted in the specific embodiment of the invention.That detects the coordinate of the mid point between 2 A and B realizes principle and implementation as as-shown-in figures 10 a and 10b.

As shown in Figure 10 a:

Positive voltage excitation V _bpbe added in the XL end of X plane, negative voltage excitation V _bnbe added in the XR end of X plane, the YT of Y plane holds series connection one outer meeting resistance R3, YB to hold series connection outer meeting resistance R4, and the resistance of outer meeting resistance R3 with R4 is identical and be at least the all-in resistance R of Y plane _{y, tot}more than 5 times, and one end outer meeting resistance R3 not being connected YT end is not connected the shorted on one end that YB holds, due to R with outer meeting resistance R4 _y1, R _y3negligible compared to outer meeting resistance R3 and R4, if ignore contact resistance R _z1and R _z2between difference and suppose R _z1=R _z2, then in fact the voltage Vy of short circuit point Xmid is exactly at R _x2the voltage that obtains of midpoint dividing potential drop.To the voltage Vy of short circuit point Xmid be detected compared to V _bp-V _bndigital voltage ratio be expressed as D (x _mid), D (x _mid) be namely equivalent to the X-direction coordinate of mid point in X plane or be interpreted as the all-in resistance R of mid point to X plane _{x, tot}the ration of division.

As shown in fig. lob, with X plane in like manner, detect the voltage Vx of short circuit point Ymid, be namely equivalent to the Y-direction coordinate of mid point in Y plane or be interpreted as the all-in resistance R of mid point to Y plane _{y, tot}the ration of division.

As above visible:

Alignment, in the detection of the coordinate of X plane, can be by applying voltage drive to the two ends of X plane and the voltage realization of the short circuit point obtained that is connected by the outer meeting resistance that resistance is equal with the two ends of Y plane;

Alignment, in the detection of the coordinate of Y plane, can be by applying voltage drive to the two ends of Y plane and the voltage realization of the short circuit point obtained that is connected by the outer meeting resistance that resistance is equal with the two ends of X plane.

Owing in the specific embodiment of the invention being the contact resistance R with detected touch point A place _z1compared to being example from XR end to the electric resistance partial pressure ratio of one section of resistance of Ax in X plane, therefore, for this example, the equivalent contact resistance R of the midpoint between calculating 2 _touchcompared to the all-in resistance R of X plane _{x, tot}the second ratio process in, only need the coordinate D (x of the X-direction of mid point in X plane _mid).

Certainly, if adopt the electric resistance partial pressure ratio compared to Y plane in practical application, then equivalent contact resistance R is calculated _touchcompared to the all-in resistance R of Y plane _{y, tot}the second ratio process in, just only need the coordinate D (y of the Y-direction of mid point in Y plane _mid), but the ultimate principle calculated is constant.

Still with the contact resistance R at detected touch point A place _z1compared to being example from XR end to the electric resistance partial pressure ratio of one section of resistance of Ax in X plane, the second ratio that step 202 calculates mode can be expressed as electric resistance partial pressure ratio D (z ₂)/D (z ₁)-1 with mid point to the all-in resistance R of X plane _{x, tot}ration of division D (x _mid) product:

$\frac{R_{\mathrm{touch}}}{R_{x,\mathrm{tot}}}=D\left(x_{\mathrm{mid}}\right)[D\left(z_2\right)/D\left(z_1\right)-1].$

3) about the step 203 in flow process as shown in Figures 2 and 3:

Following known quantity can be obtained by previous step 201 and step 202: resistance change than Δ R _y/ Δ R _x, aforementioned first ratios delta R _x/ R _{x, tot}or Δ R _y/ R _{y, tot}, the second ratio or

So, as long as step 203 carries out solving according to simultaneous relation.

In the specific embodiment of the invention by step 203 the simultaneous relation of foundation provide various ways, be expressed as Δ R with X plane for benchmark with the first ratio below _x/ R _{x, tot}, the second ratio is expressed as benchmark (namely obtaining for the electric resistance partial pressure ratio compared to X plane) with X plane situation be example, various ways is explained respectively.

3.1) the first form of simultaneous relation:

When basic value relatable being described above based on Fig. 4 and Fig. 5 a and Fig. 5 b, obtain following expression formula:

${\mathrm{\ΔR}}_x=\frac{{R_{x2}}^2}{R_{z1}+R_{z2}+(1+k_{\mathrm{xy}}\tan \mathrm{\θ})R_{x2}}$ Formula 1

${\mathrm{\ΔR}}_y=\frac{{R_{y2}}^2}{R_{z1}+R_{z2}+[1+1/\left(k_{\mathrm{xy}}\tan \mathrm{\θ}\right)]R_{y2}}$ Formula 2

In addition, from Fig. 9 and Figure 10 a, two following expression formulas can also be obtained respectively:

$D\left(z_{\mathrm{sen}2}\right)/D\left(z_{\mathrm{sen}1}\right)-1=\frac{R_{z1}{R}_{z2}}{(1+k_{\mathrm{xy}}\tan \mathrm{\θ})R_{x2}{R}_{x3}+R_{z2}(R_{x2}+R_{x3})+R_{z1}{R}_{x3}};$

And, $D\left(x_{\mathrm{mid}}\right)=\frac{R_{x3}+\frac{1}{2}{R}_{x2}\left|\right|(R_{z1}+R_{z2}+R_{y2})}{R_{x1}+R_{x2}\left|\right|(R_{z1}+R_{z2}+R_{y2})+R_{x3}}.$

Consider the simplification of theoretical analysis, first ignore contact resistance R _z1and R _z2between difference and by the contact resistance R of reality _z1and R _z2be collectively expressed as R _z.

Meanwhile, then by R _x3with R _x3relational expression be substituting to D (z ₂)/D (z ₁)-1 expression formula and D (x _mid) expression formula in, can following expression be obtained:

$R_{\mathrm{touch}}=\frac{{R_z}^2}{\left[(1+k_{\mathrm{xy}}\tan \mathrm{\θ})\right][1-\frac{1}{2D\left(x_{\mathrm{mid}}\right)}\frac{R_{x2}}{R_{x,\mathrm{tot}}}]R_{x2}+2R_z}$ Formula 3

By the point-to-point transmission sensitivity R in X plane and Y plane _y2=k _xytan θ R _x2, and above-mentioned formula 1 and formula 2 and formula 3, following system of equations can be obtained:

$R_{\mathrm{touch}}=\frac{{R_z}^2}{\left[(1+k_{\mathrm{xy}}\tan \mathrm{\θ})\right][1-\frac{1}{2D\left(x_{\mathrm{mid}}\right)}\frac{R_{x2}}{R_{x,\mathrm{tot}}}]R_{x2}+{2R}_z}$

${\mathrm{\ΔR}}_x=\frac{{R_{x2}}^2}{{2R}_z+(1+k_{\mathrm{xy}}\tan \mathrm{\θ})R_{x2}}$

${\mathrm{\ΔR}}_y=\frac{{R_{y2}}^2}{{2R}_z+[1+1/\left(k_{\mathrm{xy}}\tan \mathrm{\θ}\right)]R_{y2}}$

$k_{\mathrm{xy}}\tan \mathrm{\θ}\frac{R_{y2}}{R_{x2}}$

Based on 2 lines tilt angle theta and resistance change than Δ R _y/ Δ R _xcorresponding relation and the definition of above-mentioned system of equations according to distance between two points is transformed, then make 2 distances in expression X plane, 2 distances in expression Y plane, the contact resistance at each touch point place compared to the ratio of the all-in resistance of X plane, then can obtain following simultaneous relation:

$x_{2,\mathrm{ratio}}=\frac{(1+\sqrt{{\mathrm{\ΔR}}_y/{\mathrm{\ΔR}}_x})\frac{{\mathrm{\ΔR}}_x}{R_{x,\mathrm{tot}}}+\sqrt{{(1+\sqrt{{\mathrm{\ΔR}}_y/{\mathrm{\ΔR}}_x})}^2{\left(\frac{{\mathrm{\ΔR}}_x}{R_{x,\mathrm{tot}}}\right)}^2+8\frac{{\mathrm{\ΔR}}_x}{R_{x,\mathrm{tot}}}{z}_{\mathrm{ratio}}}}{2}$

$z_{\mathrm{ratio}}=\frac{R_{\mathrm{touch}}}{R_{x,\mathrm{tot}}}+\sqrt{{\left(\frac{R_{\mathrm{touch}}}{R_{x,\mathrm{tot}}}\right)}^2+\frac{R_{\mathrm{touch}}}{R_{x,\mathrm{tot}}}(1+\sqrt{{\mathrm{\ΔR}}_y/{\mathrm{\ΔR}}_x})[1-\frac{x_{2,\mathrm{ratio}}}{2D\left(x_{\mathrm{mid}}\right)}]x_{2,\mathrm{ratio}}}$

$k_{\mathrm{xy}}\tan \mathrm{\θ}=\sqrt{{\mathrm{\ΔR}}_y/{\mathrm{\ΔR}}_x}$

y _2，ratio＝x _2，ratiotanθ/k _xy

For this simultaneous relation:

Only x is had in the first two expression formula _{2, ratio}and z _ratiothese 2 unknown quantitys, thus can simultaneous solution; But, consider that the first two expression formula is comparatively complicated, direct solution is comparatively difficult, can be thus first z in actual applications _ratiocompose initial value and pass through solution by iterative method;

Have in 3rd expression formula resistance change than Δ R _y/ Δ R _x, resistance ratio coefficient k _xytotally 2 known quantities, only have tilt angle theta totally 1 unknown quantity, thus can direct solution independently;

4th expression formula, after first three expression formula solves, has x _{2, ratio}with tilt angle theta totally 2 known quantities, only has y _{2, ratio}totally 1 unknown quantity, thus can solve.

And then, confirm, by the contact resistance R of reality through emulation and measured data _z1and R _z2be collectively expressed as R _zto final two distance x _{2, ratio}and y _{2, ratio}accuracy in certain error allowed band, negligible.

3.2) the second form of simultaneous relation:

In order to reduce the computing difficulty of the first form, to intermediate parameters simplify.By R _zbe reduced to R _z=2R _touch.

Above-mentioned simultaneous relationship expression is as follows:

$x_{2,\mathrm{ratio}}=\frac{(1+\sqrt{{\mathrm{\ΔR}}_y/{\mathrm{\ΔR}}_x})\frac{{\mathrm{\ΔR}}_x}{R_{x,\mathrm{tot}}}+\sqrt{{(1+\sqrt{{\mathrm{\ΔR}}_y/{\mathrm{\ΔR}}_x})}^2{\left(\frac{{\mathrm{\ΔR}}_x}{R_{x,\mathrm{tot}}}\right)}^2+8\frac{{\mathrm{\ΔR}}_x}{R_{x,\mathrm{tot}}}{z}_{\mathrm{ratio}}}}{2}$

$z_{\mathrm{ratio}}=2\frac{R_{\mathrm{touch}}}{R_{x,\mathrm{tot}}}$

$k_{\mathrm{xy}}\tan \mathrm{\θ}=\sqrt{{\mathrm{\ΔR}}_y/{\mathrm{\ΔR}}_x}$

y _2，ratio＝x _2，ratiotanθ/k _xy

Confirm, through R through emulation and experimental data _zbe reduced to R _z=2R _touchafter, to final two distance x _{2, ratio}and y _{2, ratio}accuracy in certain error allowed band, negligible.

Owing to having given the R of the point-to-point transmission sensitivity in X plane and Y plane in the specific embodiment of the invention _y2=k _xytan θ R _x2, and with the tilt angle theta that herein is provided 2 lines and resistance change than Δ R _y/ Δ R _xcorresponding relation and the value relatable after generation two touch is analyzed to X plane and Y plane, therefore, based on the above-mentioned form of simultaneous relation, those skilled in the art can also expand other form, will not enumerate herein.

And, although the above-mentioned form of simultaneous relation is all be expressed as Δ R with X plane for benchmark with the first ratio _x/ R _{x, tot}, the second ratio is expressed as benchmark (namely obtaining for the electric resistance partial pressure ratio compared to X plane) with X plane situation, namely above-mentioned form is all for X plane for benchmark, but those skilled in the art also can be equal to replacement and to obtain the first ratio and be expressed as Δ R with Y plane for benchmark _y/ R _{y, tot}, the second ratio is expressed as benchmark (namely obtaining for the electric resistance partial pressure ratio compared to Y plane) with Y plane the various forms of simultaneous relation of situation, herein this also be will not enumerate.

More preferably, those skilled in the art can be arranged with the X plane simultaneous relation that is benchmark and the simultaneous relation that is benchmark with Y plane simultaneously, and switch the simultaneous relation using these two kinds of benchmark as required in actual applications by step 203.

Such as, when 2 lines are closer to when being parallel to X-direction (θ is less than 45 degree), 2 distance y in Y plane _{2, ratio}due to too small and not easily solve, now, the simultaneous relation that can to utilize with X plane be benchmark first solves 2 distance x in X plane _{2, ratio}, be converted to 2 distance y in Y plane by tan θ again _{2, ratio}; Otherwise, when 2 lines are closer to when being parallel to Y-direction (θ is greater than 45 degree), 2 distance x in X plane _{2, ratio}due to too small and not easily solve, now, the simultaneous relation that can to utilize with Y plane be benchmark first solves 2 distance y in Y plane _{2, ratio}, be converted to 2 distance x in X plane by tan θ again _{2, ratio}.

4), about the step 204 in flow process as shown in Figure 3:

So-called quadrant trend just refers to the vergence direction of two touch points, except be parallel to X-direction and be parallel to Y-direction two kinds of extreme cases except, the quadrant also existed between first quartile orientation and third quadrant orientation moves towards and quadrant between the second quadrantal bearing and fourth quadrant orientation moves towards.

To this, as long as after the both end voltage relation of one of them of X plane and Y plane is determined, can determine that quadrant moves towards by the positive negative direction of another both end voltage difference is that quadrant between first quartile orientation and third quadrant orientation moves towards or the quadrant between the second quadrantal bearing and fourth quadrant orientation moves towards.

Figure 11 a and Figure 11 b is the principle schematic diagram judging in the specific embodiment of the invention that quadrant moves towards.

Situation is as shown in fig. lla that the quadrant between first quartile orientation and third quadrant orientation moves towards.First see Figure 11 a:

Positive voltage excitation V _bpbe added in the XL end of X plane, negative voltage excitation V _bnbe added in the XR end of X plane,

Because the YT end in Y plane encourages V compared to YB end closer to negative voltage _bn, YB end encourages V compared to YT end closer to positive voltage _bp, thus V _yT-V _yB< 0;

So, for situation as shown in fig. lla, according to V _yT-V _yB< 0 just can judge that the quadrant trend of 2 lines is as one or three quadrantal bearings.

Situation is as shown in figure lib that the quadrant between the second quadrantal bearing and fourth quadrant orientation moves towards.Again see Figure 11 b, in like manner can according to V _yT-V _yB> 0 just can judge that the quadrant trend of 2 lines is as two four-quadrant orientation.

Certainly, if the both end voltage of X plane is identical, then represent a kind of extreme case being parallel to X-direction; If the both end voltage of Y plane is identical, then represent the another kind of extreme case being parallel to Y-direction.

Based on the principle identical with above-mentioned detection method, the specific embodiment of the invention additionally provides corresponding pick-up unit.

Figure 12 is a kind of example arrangement schematic diagram of the pick-up unit of the resistive touch screen being applicable to two touch in the specific embodiment of the invention.As shown in figure 12, this pick-up unit comprises:

Resistance variations detection module 1201, based on when not occurring to touch and the voltage detecting occurred to X plane and Y plane two ends after two touch (how judging whether that generation two touch can utilize existing mode to realize, repeat no more herein), calculate the ratio of Y plane compared to the resistance change of X plane; Wherein, the ratio of resistance change that resistance variations detection module 1301 calculates is directly proportional to the ratio of Y plane compared to the voltage variety of X plane;

Angle of inclination computing module 1202, according to the angle of inclination of 2 lines pre-set and the corresponding relation of the ratio of resistance change, calculates the angle of inclination of 2 lines.

As above-mentioned detection device is visible, owing to establishing the corresponding relation of angle of inclination and the ratio of resistance change in advance, therefore, as long as resistance variations detection module 1301 carries out detecting the ratio that can obtain resistance change and then the angle of inclination that also just can be obtained 2 lines by angle of inclination computing module 1302 to the voltage be directly proportional to resistance.

Resistance variations detection module 1401 realize principle and implementation is identical with the step 101 in detection method as shown in Figure 1 flow process.

In addition, the angle of inclination of 2 lines of angle of inclination computing module 1302 foundations can be expressed as with the corresponding relation of the ratio of resistance change

Figure 13 is the another kind of example arrangement schematic diagram of the pick-up unit of the resistive touch screen being applicable to two touch in the specific embodiment of the invention.As shown in figure 13, this pick-up unit comprises:

Resistance variations detection module 1301, based on when not occurring to touch and the voltage detecting occurred to X plane and Y plane two ends after two touch, calculate the resistance change of Y plane compared to any plane in the ratio of the resistance change of X plane and X plane and Y plane compared to the first ratio of the all-in resistance of this any plane; Wherein, the ratio of resistance change that resistance variations detection module 1401 calculates is directly proportional compared to the ratio of the voltage variety of X plane to Y plane, the first ratio is directly proportional compared to the ratio that voltage when touching is not occurring above-mentioned any plane to the voltage variety of above-mentioned any plane;

Contact resistance detection module 1302, detects based on the contact resistance after generation two touch, calculates second ratio of equivalent contact resistance compared to the all-in resistance of this any plane of the midpoint of point-to-point transmission; Wherein, contact resistance detection module 1402 based on contact resistance detect and be based on contact resistance compared to the electric resistance partial pressure ratio of above-mentioned any plane and the coordinate of mid point in above-mentioned any plane, the second ratio that contact resistance detection module 1402 obtains equals above-mentioned electric resistance partial pressure ratio and mid point to the product of the ration of division of the all-in resistance of above-mentioned any plane;

Distance between two points computing module ₁₃03, according to the simultaneous relation between the ratio of resistance change, the first ratio, the second ratio and 2 distances, calculate 2 distances in X plane and Y plane;

Wherein, the simultaneous relation of distance between two points computing module 1403 foundations is according to X plane and the value relatable of Y plane after generation two touch and the corresponding relation based on the point-to-point transmission resistance in X plane and Y plane is set up in advance, and this corresponding relation determines according to the angle of inclination of point-to-point transmission line and the resistance scale-up factor between X plane and Y plane.

As above-mentioned detection device is visible, because the simultaneous relation including distance between two points sets up to obtain based on angle of inclination with the corresponding relation of the ratio of resistance change and according to X plane and the value relatable of Y plane after generation two touch, therefore, the second ratio that the ratio of the resistance change obtained by resistance variations detection module 1401 and the first ratio and contact resistance detection module 1402 obtain, as the known variables in simultaneous relation, can be calculated the occurrence of distance between two points according to this simultaneous relation by distance between two points computing module 1403.

Resistance variations detection module 1401 realize principle and implementation is identical with the step 201 in detection method as shown in Figures 2 and 3 flow process.Contact resistance detection module 1402 realize principle and implementation is identical with the step 202 in detection method as shown in Figures 2 and 3 flow process.Distance between two points computing module 1403 realize principle and implementation is identical with the step 203 in detection method as shown in Figures 2 and 3 flow process.

Figure 14 is that the pick-up unit of the resistive touch screen being applicable to two touch in the specific embodiment of the invention is based on the example arrangement schematic diagram after structure extension as shown in figure 13.As shown in figure 14, this pick-up unit comprises resistance variations detection module 1301 as shown in Figure 13, contact resistance detection module 1302, distance between two points computing module 1303, also comprises:

Quadrant moves towards judge module 1304, according to the voltage relationship between X plane and the two ends of Y plane, judges the quadrant trend obtaining described point-to-point transmission line; Wherein, described quadrant trend is determined by the positive negative direction of another both end voltage difference after the both end voltage relation of one of them of X plane and Y plane is determined;

Two point coordinate computing modules 1305, according to 2 distances in quadrant trend, the coordinate of mid point in X plane and Y plane and X plane and Y plane, calculate 2 coordinates in X plane and Y plane; Wherein, two point coordinate computing modules 1305 obtain 2 are respectively at the coordinate of X plane that mid point adds at the coordinate of X plane, the half of 2 distances subtracted in X plane, 2 to be respectively at the coordinate of Y plane that mid point adds at the coordinate of Y plane, the half of described 2 distances subtracted in Y plane, described to add, 2 increase and decrease of the coordinates compared to the mid point relations subtracted represented by quadrant moves towards determine.

As above-mentioned detection device is visible, owing to can move towards by quadrant the quadrant trend that judge module 1404 judges point-to-point transmission line, now, two point coordinate computing modules 1405, according to quadrant trend and the coordinate of mid point detected and 2 distances calculated, can obtain the actual coordinate of 2.

Quadrant move towards judge module 1404 realize principle and implementation is identical with the step 204 in detection method as shown in Figure 3 flow process, realize principle and the implementation of two point coordinate computing modules 1405 are all thus just repeat no more based on the geometric relationship of routine.

The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.

Claims (12)

1. a detection method for resistive touch screen, is characterized in that, this detection method comprises:

Step a1, based on when not occurring to touch and the voltage detecting after two touch occurs, calculate the ratio of Y plane compared to the resistance change of X plane; Wherein, the ratio of described resistance change is directly proportional to the ratio of described Y plane compared to the voltage variety of described X plane;

The angle of inclination of 2 lines that step a2, foundation pre-set and the corresponding relation of the ratio of described resistance change, calculate described angle of inclination;

Described corresponding relation is $k_{\mathrm{xy}}\tan \mathrm{\&theta;}=\sqrt{\mathrm{\&Delta;}{R}_y/\mathrm{\&Delta;}{R}_x};$

Wherein, k _xyfor the scale-up factor between described Y plane and described X plane, θ is be benchmark with the X-direction corresponding to described X plane described angle of inclination, Δ R _yfor the resistance change of described Y plane, Δ R _xfor the resistance change of described X plane.

2. detection method according to claim 1, is characterized in that,

Described step a1 based on described voltage detecting be by applying current excitation respectively and detect described X plane to realize with the terminal voltage that described Y plane is connected current source with described Y plane to described X plane; And the ratio of the described resistance change that described step a1 calculates equals the ratio of described Y plane compared to the voltage variety of described X plane;

Or, described step a1 based on described voltage detecting be by connect respectively at the two ends of described X plane and described Y plane or only one end series connection outer meeting resistance two ends after series connection apply voltage drive and the both end voltage difference that detects described X plane and described Y plane realizes; And the ratio of the described resistance change that described step a1 calculates equals the ratio of described Y plane compared to the voltage variety of described X plane and the product of the preset ratio factor.

3. a detection method for resistive touch screen, is characterized in that, this detection method comprises:

Step b1, based on when not occurring to touch and the voltage detecting after two touch occurs, calculate the resistance change of Y plane compared to any plane in the ratio of the resistance change of X plane and described X plane and described Y plane compared to the first ratio of the all-in resistance of described any plane; Wherein, the ratio of described resistance change is directly proportional to the ratio of described Y plane compared to the voltage variety of described X plane, and described first ratio is directly proportional compared to the ratio that voltage when touching is not occurring described any plane to the voltage variety of described any plane;

Step b2, based on after generation two touch contact resistance detect, calculate second ratio of equivalent contact resistance compared to the all-in resistance of described any plane of the midpoint of point-to-point transmission; Wherein, described contact resistance detects and is based on contact resistance compared to the electric resistance partial pressure ratio of described any plane and the coordinate of described mid point in described any plane, and described second ratio equals described electric resistance partial pressure ratio and described mid point to the product of the ration of division of the all-in resistance of described any plane;

Simultaneous relation between step b3, the ratio according to described resistance change, described first ratio, described second ratio and 2 distances, calculates described 2 distances; Wherein, described simultaneous relation is according to value relatable after generation two touch of described X plane and described Y plane and sets up in advance based on the corresponding relation of the angle of inclination of 2 lines with the ratio of described resistance change;

Described any plane is described X plane, and the described simultaneous relation of described step b3 institute foundation comprises:

$x_{2,\mathrm{ratio}}=\frac{(1+\sqrt{\mathrm{\&Delta;}{R}_y/\mathrm{\&Delta;}{R}_x})\frac{\mathrm{\&Delta;}{R}_x}{R_{x,\mathrm{tot}}}+\sqrt{{(1+\sqrt{\mathrm{\&Delta;}{R}_y/\mathrm{\&Delta;}{R}_x})}^2{\left(\frac{\mathrm{\&Delta;}{R}_x}{R_{x,\mathrm{tot}}}\right)}^2+8\frac{\mathrm{\&Delta;}{R}_x}{R_{x,\mathrm{tot}}}{z}_{\mathrm{ratio}}}}{2};$

$z_{\mathrm{ratio}}=\frac{R_{\mathrm{touch}}}{R_{x,\mathrm{tot}}}+\sqrt{{\left(\frac{R_{\mathrm{touch}}}{R_{x,\mathrm{tot}}}\right)}^2+\frac{R_{\mathrm{touch}}}{R_{x,\mathrm{tot}}}(1+\sqrt{\mathrm{\&Delta;}{R}_y/\mathrm{\&Delta;}{R}_x})[1-\frac{x_{2,\mathrm{ratio}}}{2D\left(x_{\mathrm{mid}}\right)}]x_{2,\mathrm{tatio}}}$ Or $z_{\mathrm{ratio}}=2\frac{R_{\mathrm{touch}}}{R_{x,\mathrm{tot}}};$

$k_{\mathrm{xy}}\tan \mathrm{\&theta;}=\sqrt{\mathrm{\&Delta;}{R}_y/\mathrm{\&Delta;}{R}_x};$

y _2,ratio＝x _2,ratiotanθ/k _xy；

Wherein, x _{2, ratio}for described 2 distances after normalization in described X plane; Δ R _yfor the resistance change of described Y plane, Δ R _xfor the resistance change of described X plane, R _{x, tot}for the all-in resistance of described X plane, Δ R _y/ Δ R _xfor the ratio of described resistance change, for described first ratio; z _ratiofor the described contact resistance at each touch point place is compared to the ratio of the all-in resistance of described X plane; R _touchfor described equivalent contact resistance, for described second ratio; D (x _mid) for mid point is to the all-in resistance R of X plane _{x, tot}the ration of division; for described corresponding relation, k _xyfor the scale-up factor between described Y plane and described X plane, θ is the described angle of inclination that is benchmark with the X-direction corresponding to described X plane; y _{2, ratio}for described 2 distances after normalization in described Y plane.

4. detection method according to claim 3, is characterized in that,

Described step b1 based on described voltage detecting be by applying current excitation respectively and detect described X plane to realize with the terminal voltage that described Y plane is connected current source with described Y plane to described X plane, and the ratio of the described resistance change that described step b1 calculates equals voltage variety that described Y plane equals described any plane compared to the ratio of the voltage variety of described X plane, described first ratio compared to described any plane at the ratio that voltage when touching does not occur;

Or, described step b1 based on described voltage detecting be by connect respectively at the two ends of described X plane and described Y plane or only one end series connection outer meeting resistance and in series connection after two ends apply voltage drive, and the both end voltage difference that detects described X plane and described Y plane realizes, and, the ratio of the described resistance change that described step b1 calculates equals the ratio of described Y plane compared to the voltage variety of described X plane and the product of default first scale factor, described first ratio equals the voltage variety of described any plane compared to the product of described any plane at ratio with default second scale factor that voltage when touching does not occur.

5. detection method according to claim 3, is characterized in that,

Described step b2 based on be by applying voltage drive in one end of one end of described any plane and another plane and with the other end of the other end of described any plane and another plane described for voltage detecting point realizes to the detection of described electric resistance partial pressure ratio, and, the described electric resistance partial pressure ratio that described step b2 obtains is the dividing ratios of described contact resistance compared to one section of resistance in described any plane, described one section of resistance from described one end of described any plane in described 2 wherein.

6. detection method according to claim 3, is characterized in that, this detection method comprises further:

Step b4, according to the voltage relationship between described X plane and the two ends of described Y plane, judge obtain described point-to-point transmission line quadrant trend; Wherein, described quadrant trend is determined by the positive negative direction of another both end voltage difference after the both end voltage relation of one of them of described X plane and described Y plane is determined;

Step b5, according to described 2 distances in coordinate in described X plane and described Y plane of described quadrant trend, described mid point and described X plane and described Y plane, calculate described 2 coordinates in described X plane and described Y plane; Wherein, described 2 to be respectively at the coordinate of described X plane that described mid point adds at the coordinate of described X plane, the half of described 2 distances subtracted in described X plane, described 2 to be respectively at the coordinate of described Y plane that described mid point adds at the coordinate of described Y plane, the half of described 2 distances subtracted in described Y plane, described in add, described 2 coordinates compared to described mid point subtracted represented by described quadrant moves towards increase and decrease relation and determine.

7. a pick-up unit for resistive touch screen, is characterized in that, this pick-up unit comprises:

Resistance variations detection module, based on voltage detecting when not occurring to touch and after generation two touch, calculates the ratio of Y plane compared to the resistance change of X plane; Wherein, the ratio of described resistance change is directly proportional to the ratio of described Y plane compared to the voltage variety of described X plane;

Angle of inclination computing module, according to the angle of inclination of 2 lines pre-set and the corresponding relation of the ratio of described resistance change, calculates described angle of inclination;

Described corresponding relation is $k_{\mathrm{xy}}\tan \mathrm{\&theta;}=\sqrt{\mathrm{\&Delta;}{R}_y/\mathrm{\&Delta;}{R}_x};$

Wherein, k _xyfor the scale-up factor between described Y plane and described X plane, θ is be benchmark with the X-direction corresponding to described X plane described angle of inclination, Δ R _yfor the resistance change of described Y plane, Δ R _xfor the resistance change of described X plane.

8. pick-up unit according to claim 7, is characterized in that,

Described resistance variations detection module based on described voltage detecting be by applying current excitation respectively and detect described X plane to realize with the terminal voltage that described Y plane is connected current source with described Y plane to described X plane; And the ratio of the described resistance change that described resistance variations detection module calculates equals the ratio of described Y plane compared to the voltage variety of described X plane;

Or, described resistance variations detection module based on described voltage detecting be by connect respectively at the two ends of described X plane and described Y plane or only one end series connection outer meeting resistance two ends after series connection apply voltage drive and the both end voltage difference that detects described X plane and described Y plane realizes; And the ratio of the described resistance change that described resistance variations detection module calculates equals the ratio of described Y plane compared to the voltage variety of described X plane and the product of the preset ratio factor.

9. a pick-up unit for resistive touch screen, is characterized in that, this detection method comprises:

Resistance variations detection module, based on when not occurring to touch and the voltage detecting after two touch occurs, calculate the resistance change of Y plane compared to any plane in the ratio of the resistance change of X plane and described X plane and described Y plane compared to the first ratio of the all-in resistance of described any plane; Wherein, the ratio of described resistance change is directly proportional to the ratio of described Y plane compared to the voltage variety of described X plane, and described first ratio is directly proportional compared to the ratio that voltage when touching is not occurring described any plane to the voltage variety of described any plane;

Contact resistance detection module, detects based on the contact resistance after generation two touch, calculates second ratio of equivalent contact resistance compared to the all-in resistance of described any plane of the midpoint of point-to-point transmission; Wherein, described contact resistance detects and is based on contact resistance compared to the electric resistance partial pressure ratio of described any plane and the coordinate of described mid point in described any plane, and described second ratio equals described electric resistance partial pressure ratio and described mid point to the product of the ration of division of the all-in resistance of described any plane;

2 distance calculation module, according to the simultaneous relation between the ratio of described resistance change, described first ratio, described second ratio and 2 distances, calculate described 2 distances; Wherein, described simultaneous relation is according to value relatable after generation two touch of described X plane and described Y plane and sets up in advance based on the corresponding relation of the angle of inclination of 2 lines with the ratio of described resistance change;

Described any plane is described X plane, and the described simultaneous relation of described 2 distance calculation module institute foundations comprises:

$x_{2,\mathrm{ratio}}=\frac{(1+\sqrt{\mathrm{\&Delta;}{R}_y/\mathrm{\&Delta;}{R}_x})\frac{\mathrm{\&Delta;}{R}_x}{R_{x,\mathrm{tot}}}+\sqrt{{(1+\sqrt{\mathrm{\&Delta;}{R}_y/\mathrm{\&Delta;}{R}_x})}^2{\left(\frac{\mathrm{\&Delta;}{R}_x}{R_{x,\mathrm{tot}}}\right)}^2+8\frac{\mathrm{\&Delta;}{R}_x}{R_{x,\mathrm{tot}}}{z}_{\mathrm{ratio}}}}{2};$

$z_{\mathrm{ratio}}=\frac{R_{\mathrm{touch}}}{R_{x,\mathrm{tot}}}+\sqrt{{\left(\frac{R_{\mathrm{touch}}}{R_{x,\mathrm{tot}}}\right)}^2+\frac{R_{\mathrm{touch}}}{R_{x,\mathrm{tot}}}(1+\sqrt{\mathrm{\&Delta;}{R}_y/\mathrm{\&Delta;}{R}_x})[1-\frac{x_{2,\mathrm{ratio}}}{2D\left(x_{\mathrm{mid}}\right)}]x_{2,\mathrm{tatio}}}$ Or $z_{\mathrm{ratio}}=2\frac{R_{\mathrm{touch}}}{R_{x,\mathrm{tot}}};$

$k_{\mathrm{xy}}\tan \mathrm{\&theta;}=\sqrt{\mathrm{\&Delta;}{R}_y/\mathrm{\&Delta;}{R}_x};$

y _2,ratio＝x _2,ratiotanθ/k _xy；

Wherein, x _{2, ratio}for described 2 distances after normalization in described X plane; Δ R _yfor the resistance change of described Y plane, Δ R _xfor the resistance change of described X plane, R _{x, tot}for the all-in resistance of described X plane, Δ R _y/ Δ R _xfor the ratio of described resistance change, for described first ratio; z _ratiofor the described contact resistance at each touch point place is compared to the ratio of the all-in resistance of described X plane; R _touchfor described equivalent contact resistance, for described second ratio; D (x _mid) for mid point is to the all-in resistance R of X plane _{x, tot}the ration of division; for described corresponding relation, k _xyfor the scale-up factor between described Y plane and described X plane, θ is the described angle of inclination that is benchmark with the X-direction corresponding to described X plane; y _{2, ratio}for described 2 distances after normalization in described Y plane.

10. pick-up unit according to claim 9, is characterized in that,

Described resistance variations detection module based on described voltage detecting be by applying current excitation respectively and detect described X plane to realize with the terminal voltage that described Y plane is connected current source with described Y plane to described X plane, and the ratio of the described resistance change that described resistance variations detection module calculates equals voltage variety that described Y plane equals described any plane compared to the ratio of the voltage variety of described X plane, described first ratio compared to described any plane at the ratio that voltage when touching does not occur;

Or, described resistance variations detection module based on described voltage detecting be by connect respectively at the two ends of described X plane and described Y plane or only one end series connection outer meeting resistance and in series connection after two ends apply voltage drive, and the both end voltage difference that detects described X plane and described Y plane realizes, and, the ratio of the described resistance change that described resistance variations detection module calculates equals the ratio of described Y plane compared to the voltage variety of described X plane and the product of default first scale factor, described first ratio equals the voltage variety of described any plane compared to the product of described any plane at ratio with default second scale factor that voltage when touching does not occur.

11. pick-up units according to claim 9, is characterized in that,

Described contact resistance detection module based on be by applying voltage drive in one end of one end of described any plane and another plane and with the other end of the other end of described any plane and another plane described for voltage detecting point realizes to the detection of described electric resistance partial pressure ratio, and, the described electric resistance partial pressure ratio that described contact resistance detection module obtains is the dividing ratios of described contact resistance compared to one section of resistance in described any plane, described one section of resistance from described one end of described any plane in described 2 wherein.

12. pick-up units according to claim 9, is characterized in that, this pick-up unit comprises further:

Quadrant moves towards judge module, according to the voltage relationship between described X plane and the two ends of described Y plane, judges the quadrant trend obtaining described point-to-point transmission line; Wherein, described quadrant trend is determined by the positive negative direction of another both end voltage difference after the both end voltage relation of one of them of described X plane and described Y plane is determined;

Two point coordinate computing modules, according to described 2 distances in coordinate in described X plane and described Y plane of described quadrant trend, described mid point and described X plane and described Y plane, calculate described 2 coordinates in described X plane and described Y plane; Wherein, described 2 to be respectively at the coordinate of described X plane that described mid point adds at the coordinate of described X plane, the half of described 2 distances subtracted in described X plane, described 2 to be respectively at the coordinate of described Y plane that described mid point adds at the coordinate of described Y plane, the half of described 2 distances subtracted in described Y plane, described in add, described 2 coordinates compared to described mid point subtracted represented by described quadrant moves towards increase and decrease relation and determine.