CN101604220B - Resistive touch panel and detection method for its contact point shape - Google Patents

Abstract

The invention discloses a resistance-type touch panel and a detection method of the contact point form thereof. The resistive touch panel has a plurality of detection areas. The method comprises the following steps: when a touch panel is found to generate a touch action, acquiring a plurality of contact point positions; when the contact points are positioned in the adjacent detection areas, judging whether the contact points can be combined into a combined contact point; and when the contact points can be merged into a merged contact point, judging the merged contact point to be a contact point of a first form or a contact point of a second form. The present invention can quickly determine whether a plurality of contact points can be merged into a merged contact point, and can further distinguish the merged contact point into a contact point of a first form or a contact point of a second form.

Description

Resistive touch panel and detection method for its contact point shape

technical field

The invention relates to a resistive touch panel and a detection method thereof, in particular to a resistive touch panel and a detection method of a contact point form thereof. the

Background technique

With the rapid development of computer technology, touch panels are also widely used in mobile phone screens, computer screens, and personal digital assistant (PDA) screens. Basically, a touch panel can be used as an input device of a computer to replace a mouse. Currently, resistive touch panels are most commonly used in touch panels. the

Please refer to FIG. 1A , which is a side view of a conventional resistive touch panel. Form a plurality of strip-shaped indium tin oxide (Indium Tin Oxide, ITO for short) layers 102 on the surface of a transparent glass (glass) substrate 100; in addition, form a plurality of strip-shaped ITO layers on the surface of a transparent film (film) 110 112 ; wherein, the striped ITO layer 102 on the transparent glass substrate 100 and the striped ITO layer 112 on the transparent film 110 are perpendicular to each other. In addition, a plurality of transparent spacer dots 120 isolate the strip-shaped ITO layer 102 on the transparent glass substrate and the strip-shaped ITO layer 112 on the transparent film 110 so that they do not contact each other. the

When the user presses the transparent film 110 with a finger or a stylus, the stripe-shaped ITO layer 112 on the transparent film 110 is deformed and contacts the stripe-shaped ITO layer 102 on the transparent glass substrate 100 . And the control circuit (not shown) of the touch panel can calculate the position of the contact point pressed by the user. the

Please refer to FIG. 1B , which is a top view of a conventional resistive touch panel. For example, four electrodes are arranged around the touch panel 10, a negative Y electrode Y−, a positive Y electrode Y+, a negative X electrode X−, and a positive X electrode X+. In addition, the strip-shaped ITO layers 102 on the glass substrate are arranged in a vertical direction, and the two ends of all the strip-shaped ITO layers 102 are respectively connected to the negative Y electrode Y- and the positive Y electrode Y+; The ITO layers 112 are arranged in a horizontal direction, and two ends of all the strip-shaped ITO layers 112 are respectively connected to a negative X electrode X− and a positive X electrode X+. Wherein, all the strip-shaped ITO layers 102 and 112 can be equivalent to resistors. the

In addition, the control circuit 150 is respectively connected to the negative Y electrode Y−, the positive Y electrode Y+, the negative X electrode X− and the positive X electrode X+ by using the Y− line, the Y+ line, the X− line, and the X+ line. When the user makes a contact point on the touch panel 10 , the control circuit 150 can quickly know the position of the contact point. the

Please refer to FIG. 2A , which is a schematic diagram of detecting whether a contact point is generated on a conventional resistive touch panel. First, in order to know whether the user has touched the touch panel, the control circuit (not shown) will connect a voltage source Vcc to the positive X electrode X+, connect the ground terminal to the negative Y electrode Y-, and connect the negative X electrode X- is connected to the control circuit to provide the voltage Va, and the positive Y electrode Y+ is not connected (open). the

Obviously, when the user does not press the touch panel, the upper and lower strip-shaped ITO layers are not in contact. Therefore, the voltage Va received by the control circuit at the negative X electrode X− is equal to the voltage Vcc, that is, it means that no user has pressed the touch panel yet. the

When the user presses the touch panel with the stylus 140 , the upper and lower strip-shaped ITO layers are in contact with the contact point A. As shown in FIG. Therefore, the control circuit detects that the negative X electrode X- receives a voltage less than Vcc ( $\mathrm{Va}=\frac{(\mathrm{<figure-callout\; id="4"\; label="R"\; filenames="H2009101597682E00142.png"\; state="\{\{state\}\}">R</figure-callout>}4+\mathrm{Rz})\&Center\; Dot;\mathrm{Vcc}}{R1+\mathrm{Rz}+R4}$ ), that is, it can be determined that the user has pressed the touch panel at this time, that is, the control circuit finds that a touch action has occurred. Among them, Rz is the contact resistance when two strip-shaped ITO layers are in contact.

Please refer to FIG. 2B , which is a schematic diagram of calculating the horizontal position of a contact point on a conventional resistive touch panel. After the control circuit learns that the user generates a touch action, the control circuit will continue to calculate the position of the contact point. In order to know the horizontal position of the contact point, when the control circuit detects the contact point A, the control circuit will perform a switching action, connect a voltage source Vcc to the positive X electrode X+, and connect the ground terminal to the negative X electrode X- , connect the positive Y electrode Y+ to the control circuit to receive the voltage Vx, and open the negative Y electrode Y−. the

Obviously, the voltage on the positive Y electrode Y+ is $\mathrm{Vx}=\frac{R2\&CenterDot;\mathrm{Vcc}}{R1+R2}$ . It can be seen from FIG. 2B that the voltage Vx is higher when the contact point A is closer to the right side; conversely, the voltage Vx is lower when the contact point A is closer to the left side. Therefore, the control circuit can convert the Vx voltage from analog to digital (analog to digital conversion) to obtain the horizontal position of the contact point.

Similarly, please refer to FIG. 2C , which is a schematic diagram of calculating the vertical position of a contact point on a conventional resistive touch panel. In order to know the vertical position of contact point A, after the control circuit calculates the horizontal position of contact point A, the control circuit will switch again, connect a voltage source Vcc to the positive Y electrode Y+, and connect the ground terminal to the negative electrode Y+. The Y electrode Y-, the positive X electrode X+ is connected to the control circuit to receive the voltage Vy, and the negative X electrode X- is not connected (open). the

Obviously, the voltage on the positive X electrode X+ is $\mathrm{Vy}=\frac{\mathrm{<figure-callout\; id="4"\; label="R"\; filenames="H2009101597682E00142.png"\; state="\{\{state\}\}">R</figure-callout>}4\&CenterDot;\mathrm{Vcc}}{R3+\mathrm{<figure-callout\; id="4"\; label="R"\; filenames="H2009101597682E00142.png"\; state="\{\{state\}\}">R</figure-callout>}4}$ . It can be seen from FIG. 3C that when the contact point A is closer to the upper end, the voltage Vy will be higher; conversely, when the contact point A is closer to the lower end, the voltage Vy will be lower. Therefore, the control circuit can perform analog to digital conversion of the Vy voltage to obtain the vertical position of the contact point.

Obviously, the above touch panel is surrounded by four electrodes (negative Y electrode, positive Y electrode, negative X electrode and positive X electrode) to form a detection area. In addition, FIG. 2A is used to determine whether there is a touch action in the detection area. When a touch action is generated, the control circuit will continue to perform the steps shown in FIG. 2B and FIG. 2C to obtain the horizontal position and vertical position of the contact point. On the contrary, when no contact point is generated, the control circuit will remain in the state of FIG. 2A and wait for the generation of the touch action. the

Since the above-mentioned resistive touch panel is an analog touch panel, when the user makes multiple touch points on the touch panel at the same time, the control circuit will not be able to correctly detect the multiple touch points and will calculate an output Wrong point of contact. For example, please refer to FIG. 3 , which is a schematic diagram of generating multiple contact points on a conventional resistive touch panel. The detection area 160 is defined by four electrodes (not shown). When the user touches the detection area 160 at the same time, the touch point A1 and the touch point A2 are generated. Suppose the horizontal position and vertical position of the contact point A1 are (x1, y1) and the horizontal position and vertical position of the contact point A2 are (x2, y2), then the control circuit will calculate the wrong contact point A3, wherein the horizontal position of A3 and The vertical position is ( $\frac{x1+x2}{2},\frac{\mathrm{the\; y}1+\mathrm{the\; y}2}{2}$ ).

In order to be able to detect multiple touch points on the resistive touch panel, a new resistive touch panel structure has been developed. Please refer to FIG. 4A , which is a schematic diagram of a resistive touch panel capable of detecting multiple touch points. It includes four groups of electrodes X1+~X3+, X1~X3-, Y1+~Y4+, Y1-~Y4-. In addition, this resistive touch panel only divides the positive X group (X+group) and the negative X group (X-group) into three electrodes, and the positive Y group (Y+group) and the negative Y group (Y -group) are individually divided into four electrodes as an example. Of course, any combination of the number of divisions is also possible, and is not limited to the combination shown in FIG. 4 . the

In Figure 4A, the three electrodes of the positive X group (X+group) are the positive X-electrode X1+, the positive X-two electrodes X2+ and the positive X-three electrodes X3+; the three electrodes of the negative X-group (X-group) are the negative One X electrode X1-, two negative X electrodes X2- and three negative X electrodes X3-; the four electrodes of the positive Y group (Y+group) are positive Y one electrode Y1+, positive Y two electrodes Y2+, and positive Y three electrodes Y3+ and the positive Y four-electrode Y4+; the four electrodes of the negative Y group (Y-group) are the negative Y-one electrode Y1-, the negative Y-two electrode Y2-, the negative Y three-electrode Y3- and the negative Y four-electrode Y4-. Obviously, the above four groups of electrodes can generate 12 detection areas. For example, the positive X-electrode X1+, the negative X-electrode X1-, the positive Y-electrode Y1+, and the negative Y-electrode Y1- can form the detection area D ₁₁ , and so on.

In addition, the multiplexing switching circuit 230 is connected to all electrodes, and can selectively connect the X+ line to some or all electrodes in the X+ group according to the control signal of the control circuit 250; the X- line is connected to the X- group Some or all of the electrodes in the Y+ group; the Y+ line is connected to some or all of the electrodes in the Y+ group; the Y- line is connected to some or all of the electrodes in the Y- group. the

The following describes in detail the actions of the touch panel capable of detecting multiple touch points. Please refer to FIG. 4B , which shows an equivalent circuit when detecting a touch point program. In order to know whether the user has a touch action on the touch panel 200, the control circuit 250 controls the X+ line to be connected to all the electrodes in the X+ group; the X- line is connected to all the electrodes in the X- group; the Y+ line is connected to To all electrodes in the Y+ group; the Y- line connects to all electrodes in the Y- group. In addition, the control circuit 250 will perform the first switching action, connect a voltage source Vcc to the X+ line, connect the ground terminal to the Y- line, use the signal of the X- line as a judgment signal, and not connect (open) the Y+ line. Wire. At this time, the control circuit 250 can detect whether all areas on the touch panel 200 are touched. The judging method is the same as that in FIG. 2A and will not be repeated here. the

For example, when the control circuit 250 learns that the user has made a touch action (such as the contact point B1), the control signal on the control circuit 250 can control the multiplexing switching circuit 230 to sequentially switch the X-line, X+ line, The Y-line and Y+ line are connected to 12 detection areas, and detect whether contact points are generated on the 12 detection areas. Finally, as shown in FIG. 4C , the contact point B1 can be obtained on the detection area D ₃₁ where the positive Y-electrode Y1+, the negative Y-electrode Y1-, the positive X three-electrode X3+, and the negative X-three electrode X3- match. Calculate the horizontal position and vertical position of the contact point B1. The calculation method of the position of the contact point B1 is the same as that in FIG. 2B and FIG. 2C , so it will not be repeated here.

Similarly, as shown in FIG. 5 , when the user generates multiple contact points (eg, contact points B1 , B2 , B3 ) at the same time, the control circuit 250 will know that the user has generated a touch action. At this moment, the control circuit 250 has no way of knowing that the user generates a single contact point or multiple contact points. the

Then, the control signal on the control circuit 250 can control the multiplexing switching circuit 230 to connect the X-line, X+ line, Y-line, and Y+ line to the 12 detection areas in sequence, and detect whether the 12 detection areas have Contact point. Finally, it can be known that each of the detection area D ₁₃ , the detection area D ₃₁ , and the detection area D ₃₃ has a contact point, and the control circuit can calculate the position of the contact point B2 in the detection area D ₁₃ , and the contact point in the detection area D ₃₁ The position of B1, the position of the contact point B3 in the detection area _D34 .

In some specific situations, the user may accidentally generate multiple touch points, and the control circuit of a known touch panel capable of detecting multiple touch points will also calculate the positions of the multiple touch points. Please refer to FIG. 6 , when the user operates with the stylus 140 , he usually puts the finger 130 or the palm 135 on the touch panel 200 . At this time, the control circuit will calculate multiple contact points, but the contact points generated by pressing the palm and fingers are not effective contact points. Therefore, how to use the control circuit to determine the form of the contact point on the touch panel that can detect multiple contact points, and further use the form of the contact point to determine the effective contact point and the ineffective contact point is the object of the present invention. The problem to be solved. the

Contents of the invention

In order to solve the problems in the prior art, the present invention proposes a detection method for the shape of the contact point of the resistive touch panel. There are multiple detection areas on this resistive touch panel. The method includes the following steps: when a contact action is found on a touch panel, obtaining a plurality of contact point positions; when these contact points are located in adjacent detection areas, judging whether these contact points can be merged into a merged contact point, Wherein, when the distance between any two contact points in the plurality of contact points is less than a first threshold length, the plurality of contact points can be merged into the merged contact point; and, when these contact points can be merged into When merging contact points, it is judged that the merged contact point is a contact point of a first form or a contact point of a second form. the

The present invention also proposes a resistive touch panel, comprising: a first electrode group in the first direction, including m electrodes; a second electrode group in the first direction, including m electrodes; a first electrode group in the second direction, including n electrodes; a second electrode group in the second direction, including n electrodes, wherein 2m+2n electrodes can divide the resistive touch panel into m×n detection areas; a multiplexing switching circuit, connected to all 2m+2n electrodes; and, a control circuit connected to the multiplexing switching circuit, which can determine whether multiple contact points can be merged into a merged contact point after a touch action is generated, wherein , when the distance between any two contact points in the plurality of contact points is less than a first threshold length, the plurality of contact points can be merged into the merged contact point, and after confirming that the plurality of contact points can When merging into a merged contact point, distinguish the merged contact point as a contact point of the first form or a contact point of the second form. the

The present invention can quickly judge whether multiple contact points can be merged into a merged contact point, and can further distinguish the merged contact point into a first form of contact point or a second form of contact point. the

In order for the examiner to further understand the features and technical content of the present invention, please refer to the following detailed description and accompanying drawings of the present invention. However, the accompanying drawings are for reference and illustration only, and are not intended to limit the present invention. the

Description of drawings

FIG. 1A is a side view of a conventional resistive touch panel. the

FIG. 1B is a top view of a conventional resistive touch panel. the

FIG. 2A is a schematic diagram of detecting whether a contact point is generated on a conventional resistive touch panel. the

FIG. 2B is a schematic diagram of calculating the horizontal position of a contact point on a conventional resistive touch panel. the

FIG. 2C is a schematic diagram of calculating the vertical position of a contact point on a conventional resistive touch panel. the

FIG. 3 is a schematic diagram of generating multiple contact points on a conventional resistive touch panel. the

FIG. 4A is a schematic diagram of a resistive touch panel capable of detecting multiple touch points. the

FIG. 4B and FIG. 4C show the equivalent circuit when detecting the contact point procedure. the

FIG. 5 is a schematic diagram of detecting multiple contact points on a resistive touch panel. the

FIG. 6 is a schematic diagram of user operations on the touch panel. the

FIG. 7A is a schematic diagram of using fingers to form contact points. the

FIG. 7B is a schematic diagram of forming a contact point with a stylus. the

FIG. 8 is a schematic diagram of a resistive touch panel capable of detecting multiple touch points. the

FIG. 9 illustrates the method for distinguishing the position of the contact point. the

10A-10D are schematic diagrams of various contact points. the

FIG. 11A shows the first embodiment of the method for judging the shape of the contact point of the present invention. the

FIG. 11B shows the second embodiment of the method for judging the shape of the contact point of the present invention. the

Among them, the reference signs are explained as follows:

10 touch panel

100 transparent glass substrate 102 ITO layer

110 transparent film 112 ITO layer

120 transparent isolation points 130 fingers

140 stylus

150 Control circuit 160 Detection area

200 Touch Panel 230 Multiplexing Switching Circuit

250 control circuit

800 Touch Panel 830 Multiplexing Switching Circuit

850 control circuit

Detailed ways

Please refer to FIG. 7A , which is a schematic diagram of using fingers to form contact points. When using the finger 130 to press the touch panel, due to the large contact area, the contact area of the upper and lower strip-shaped ITO layers 112, 102 will be larger; similarly, the contact point generated by the palm (palm) will also make the The upper and lower strip-shaped ITO layers 112, 122 have relatively large contact areas. In addition, please refer to FIG. 7B , which is a schematic diagram of forming contact points with the stylus 140 . Since the area of the tip of the stylus is small, when the stylus is used to press the touch panel, the contact area of the upper and lower strip-shaped ITO layers will be smaller. And the present invention utilizes this characteristic to judge that the contact point is the contact point of the first form or the contact point of the second form, wherein, the contact point of the first form is a small-area contact point, such as a stylus contact point, a pointed object contact point point, pen tip contact point; the contact point of the second form is a large-area contact point, such as a finger contact point and a palm contact point. the

Generally speaking, in order to accurately detect multiple touch points, the current resistive touch panel capable of detecting multiple touch points must be divided into many detection areas. In other words, the length of the electrodes on the positive X group (X+group), X group (X-group), positive Y group (Y+group) and negative Y group (Y-group) will be very short, making the touch The detection area on the panel increases, and the area of each detection area decreases. the

Please refer to FIG. 8 , which is a schematic diagram of a resistive touch panel capable of detecting multiple touch points. It includes four groups of electrodes: the first electrode group in the X direction (X1+~Xm+), the second electrode group in the X direction (X1-~Xm-), the first electrode group in the Y direction (Y1+~Yn+), and the second electrode group in the Y direction. Two electrode groups (Y1-～Yn-). Therefore, the entire resistive touch panel 800 can be divided into m×n detection areas. the

In addition, the multiplexing switching circuit 830 is connected to all electrodes, and can selectively connect the X+ line to some or all electrodes in the X+ group according to the control signal of the control circuit 850; the X- line is connected to the X- group Some or all of the electrodes in the Y+ group; the Y+ line is connected to some or all of the electrodes in the Y+ group; the Y- line is connected to some or all of the electrodes in the Y- group. the

In addition, when the area of the detection area is small, if a finger or palm touches the touch panel, it is easy to press to the boundary of the detection area, and a contact point is generated in an adjacent detection area at the same time. That is, when the multiple contact points are not in the adjacent detection area, the multiple contact points can be directly output; otherwise, when the multiple contact points are in the adjacent detection area, further judgment is necessary. the

Please refer to FIG. 9 , which shows the method for distinguishing the positions of the contact points. When the control circuit has not found any touch action, as in step S901, the touch action is continuously detected. When the control circuit finds that there is a touch action, as in step S901, it will calculate the position of the contact point, and obtain a plurality of contact point positions, as in step S902. the

Next, it is judged whether the above-mentioned contact point is located in an adjacent detection area, as in step S903. If step S903 is not established, directly output the positions of the plurality of contact points, as in step S904; otherwise, when step S903 is established, continue to determine whether the plurality of contact points can be merged into a merged contact point, as in step S905. the

When it is determined that the contact points cannot be merged, as in step S905, directly output the positions of the plurality of contact points, as in step S904. When it is determined that the touch points can be merged, as in step S905, a merged touch point is output. the

The process of FIG. 9 is explained below according to the contact point examples of FIGS. 10A-10D . Wherein, the contact points in FIG. 10A and FIG. 10B cannot become a merged contact point. And the contact points in Fig. 10C and Fig. 10D can be merged into a merged contact point

As shown in FIG. 10A, when a touch action occurs, as in step S901, the control circuit 850 can calculate the position of the contact point p1 in the detection area (a1), the position of the contact point p2 in the detection area (b1), and the position of the contact point in the detection area (c1). ) of the contact point p3, as in step S902. Since the detection areas (a1), (b1), and (c1) are not adjacent detection areas, as in step S90, the control circuit 850 can directly output the position of the contact point p1, the position of the contact point p2, and the position of the contact point p3, as in step S90. S904. the

As shown in FIG. 10B , when a touch action occurs, as in step S901 , the control circuit 850 can calculate the position of the contact point p4 in the detection area ( a2 ) and the position of the contact point p5 in the detection area ( b2 ). Since the detection areas (a2) and (b2) are adjacent detection areas, as in step S903, the control circuit 850 continues to determine whether the contact points p4 and p5 can be merged, as in step S904. the

In the step of judging whether the contact points can be merged, such as step S904, a first threshold length Lth1 may be preset in the control circuit, and compared with the distance between the contact points p4p5. When the distance between the contact point p4p5 is greater than the first threshold length Lth1, the contact point p4p5 cannot be merged, and the position of the contact point p4 and the position of the contact point p5 are output at this time, as in step S904. the

The finger contact point 910 in FIG. 10C is taken as an example. When the touch action occurs, as in step S901, the control circuit 850 can calculate the position of the contact point p6 in the detection area (a3) and the position of the contact point p7 in the detection area (b3). Since the detection areas (a3) and (b3) are adjacent detection areas, as in step S903, the control circuit 850 continues to determine whether the contact points p6 and p7 can be merged, as in step S904. the

In the step of judging whether the contact points can be merged, such as in step S904, a first threshold length Lth1 may be preset in the control circuit, and compared with the distance between the contact points p6p7. Obviously, the finger contact point 910 produces a contact point p6, p7 on the adjacent detection area (a3) (b3), and the distance between the contact point p6p7 is smaller than the first threshold length Lth1. Therefore, the contact points p6p7 can be merged, and a merged contact point is output, as in step S906. That is to say, assuming that the position of the contact point p6 is (x6, y6) and the position of the contact point p7 is (x7, y7), the position of the merged contact point is ( $\frac{x6+x7}{2},\frac{\mathrm{the\; y}6+\mathrm{the\; <figure-callout\; id="7"\; label="y"\; filenames="H2009101597682E00041.png"\; state="\{\{state\}\}">y</figure-callout>}7}{2}$ ).

The finger contact point 920 in FIG. 10C produces contact points p8 and p9 in adjacent detection areas ( c3 ) ( d3 ), and the distance between the contact points p8 p9 is smaller than the first threshold length Lth1 . Therefore, the contact points p8p9 can be merged, and a merged contact point is outputted, as in step S906. That is to say, assuming that the position of the contact point p8 is (x8, y8) and the position of the contact point p9 is (x9, y9), the position of the merged contact point is ( $\frac{x8+x9}{2},\frac{\mathrm{the\; y}8+\mathrm{the\; y}9}{2}$ ).

The finger contact point 930 in FIG. 10C produces contact points p10 , p11 , and p12 in adjacent detection areas ( e3 ) ( f3 ) ( g3 ), and the distance between any two contact points is smaller than the first threshold length Lth1 . Therefore, the touch points p10p11p12 can be merged, and a merged touch point is output (step S906). That is to say, assuming that the position of the contact point p10 is (x10, y10), the position of the contact point p11 is (x11, y11), and the position of the contact point p12 is (x12, y12), then the position of the merged contact point is ( $\frac{x10+x11+x12}{3},\frac{\mathrm{the\; <figure-callout\; id="10"\; label="y"\; filenames="H2009101597682E00021.png"\; state="\{\{state\}\}">y</figure-callout>}10+\mathrm{the\; y}11+\mathrm{the\; y}12}{3}$ ).

The finger contact point 940 of FIG. 10C generates contact points p13, p14, p15, p16 in the adjacent detection area (h3)(i3)(j3)(k3), and the distance between any two contact points is less than the first threshold length Lth1. Therefore, the touch points p13p14p15p16 can be merged, and a merged touch point is outputted, as in step S906. That is to say, assuming that the position of the contact point p13 is (x13, y13), the position of the contact point p14 is (x14, y14), the position of the contact point p15 is (x15, y15), and the position of the contact point p16 is (x16, y16), then The location of the merged contact point is ( $\frac{x13+x14+x15+x16}{4},\frac{\mathrm{the\; y}13+\mathrm{the\; <figure-callout\; id="14"\; label="y"\; filenames="H2009101597682E00142.png"\; state="\{\{state\}\}">y</figure-callout>}14+\mathrm{the\; y}15+\mathrm{the\; y}16}{4}$ ).

Similarly, when the contact point of the stylus touches the boundary of the detection area of the touch panel, the adjacent detection areas generate contact points at the same time. The touch point 960 of the stylus in FIG. 10D is located at two contact points where the adjacent detection area ( a4 ) and detection area ( b4 ) will be located, and the two contact points will be very close. Obviously, the distance between the two contact points generated by the contact point 960 of the stylus is smaller than the first threshold length Lth1. Therefore, the two touchpoints can be merged to output a merged touchpoint, as in step S906. the

The touch point 970 of the stylus in FIG. 10D is located at two contact points where the adjacent detection area ( c4 ) and detection area ( d4 ) will occur, and the two contact points will be very close. Obviously, the distance between the two contact points generated by the contact point 970 of the stylus is smaller than the first threshold length Lth1. Therefore, the two touchpoints can be merged to output a merged touchpoint, as in step S906. the

The contact point 980 of the stylus in FIG. 10D is located at the position of three contact points in the adjacent detection area ( e4 ), detection area ( f4 ) and detection area ( g4 ), and the three contact points are very close. Obviously, the distance between any two contact points generated by the stylus contact point 970 is smaller than the first threshold length Lth1. Therefore, the three touch points can be merged, and a merged touch point is outputted, as in step S906. the

The contact point 990 of the stylus pen in FIG. 10D is located at four contact points where the adjacent detection area (h4), detection area (i4), detection area (j4) and detection area (k4) will occur. These four contact points will be very near. Obviously, the distance between any two contact points generated by the stylus contact point 970 is smaller than the first threshold length Lth1. Therefore, the four touch points can be merged, and a merged touch point is outputted, as in step S906. the

When the control circuit 850 generates the merged contact point, the control circuit 850 can further determine the shape of the merged contact point. Please refer to FIG. 11A , which shows the first embodiment of the method for judging the shape of the contact point of the present invention. When it is confirmed that multiple contact points can be merged into one combined contact point, as in step S1100 , the sum of the distances between the multiple contact points and the merged contact point is compared with a second threshold distance Lth2 . the

When the sum of the distances between the multiple contact points and the merged contact point is less than the second threshold length, as in step S1101, the merged contact point is a contact point of the first form, as in step S1102; otherwise, when the multiple When the sum of the distances between the contact points and the merged contact point is greater than the second threshold length, as in step S1101, the merged contact point is a contact point of a second form, as in step S1103. the

Therefore, the present invention further obtains a plurality of contact point positions after a touch action is found. When multiple contact points are detected on the adjacent detection area of the boundary at the same time, the number of these contact points and the distance between the contact points can be used to determine whether these contact points can be merged into a merged contact point, and the combined contact point can be further judged. form. the

In addition, the judging step S1101 can be realized by using other judging methods. Please refer to FIG. 11B , which shows the second embodiment of the method for judging the shape of the contact point of the present invention. Step S1104 compares the sum of the distances between the plurality of contact points with a second threshold distance Lth2. When the sum of the distances between the plurality of contact points is less than the second threshold distance Lth2, as in step S1104, the merged contact point is a contact point of the first form, as in step S1102; otherwise, when the plurality of When the sum of the distances between the contact points is greater than the second threshold length, as in step S1104, the merged contact point is a contact point of a second form, as in step S1103. the

Obviously, it can be known from Fig. 10C and Fig. 10D that when the finger contact point touches the boundary of the adjacent detection area, the distance between the contact points is longer; otherwise, the touch pen contact point touches the adjacent detection area When detecting the boundaries of an area, the distance between its contact points is short. By using this feature to preset a second threshold length, the shape of the merged contact point can be further judged when the plurality of contact points can be merged into a merged contact point. the

According to the first and second embodiments of the present invention, the advantage of the present invention is to provide a resistive touch panel and a contact point shape detection method thereof. When contact points are generated in a plurality of adjacent detection areas, it can be quickly judged whether the plurality of contact points can be merged into a merged contact point. After confirming that it can become a merged contact point, the merged contact point can be further classified as a contact point of the first form or a contact point of the second form. the

In summary, although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make various modifications without departing from the spirit and scope of the present invention. and retouching, so the protection scope of the present invention should be determined by the scope defined in the appended claims. the

Claims (10)

1. the contact point form detection method of an electric resistance touch-control panel has a plurality of surveyed areas on this electric resistance touch-control panel, comprises the following steps:

When on a contact panel, finding to have a contact action to produce, obtain a plurality of contact points;

When said a plurality of contact points are positioned at adjacent surveyed area; Judging that said a plurality of contact point could merge becomes one and merges contact point; Wherein, When the distance between wantonly two contact points in said a plurality of contact points was faced the limit for length and spent less than one first, said a plurality of contact points can merge became this merging contact point; And

Can merge when becoming this merging contact point in said a plurality of contact points, judge the contact point that this merging contact point is one first form or the contact point of one second form.

2. contact point form detection method as claimed in claim 1 also comprises: when said a plurality of contact points are not positioned at adjacent surveyed area, export said a plurality of contact point.

3. contact point form detection method as claimed in claim 1 also comprises: when said a plurality of contact points can not merge when becoming this merging contact point, export said a plurality of contact point.

4. contact point form detection method as claimed in claim 1, wherein can merge in said a plurality of contact points becomes in the step when merging contact point, also comprises:

Obtain the position of this merging contact point;

Calculate said a plurality of contact point and this merging contact point one apart from summation;

When this faced the limit for length and spend less than one second apart from summation, this merges contact point was the contact point of this first form; And

When this apart from summation greater than this second when facing the limit for length and spending, this merges contact point is the contact point of this second form.

5. contact point form detection method as claimed in claim 1 wherein can merge in the step when becoming this merging contact point in said a plurality of contact points, also comprises:

Calculate one between said a plurality of contact point apart from summation;

When this faced the limit for length and spend less than one second apart from summation, this merges contact point was the contact point of this first form; And

When this apart from summation greater than this second when facing the limit for length and spending, this merges contact point is the contact point of this second form.

6. contact point form detection method as claimed in claim 1, wherein, the contact point of this first form is a small size contact point, and the contact point of this second form is a large tracts of land contact point.

7. contact point form detection method as claimed in claim 1, wherein, the contact point of this first form is a sticker contact point; And the contact point of this second form is a proficiency finger contact or a palm contact point.

8. electric resistance touch-control panel comprises:

One first direction, the first electrode group comprises the m electrode;

One first direction, the second electrode group comprises the m electrode;

One second direction, the first electrode group comprises n electrode;

One second direction, the second electrode group comprises n electrode, and wherein 2m+2n electrode is divided into m * n surveyed area with this electric resistance touch-control panel district;

One multiplexed commutation circuit is connected to all 2m+2n electrode; And

One control circuit; Be connected to this multiplexed commutation circuit; After a touch action produced, judging whether a plurality of contact points can merge became one and merges contact point, wherein; When the distance between wantonly two contact points in said a plurality of contact points is faced the limit for length and is spent less than one first; Said a plurality of contact point can merge becomes this merging contact point, and in confirming that said a plurality of contact points can merge into one when merging contact point, distinguish this mergings contact point the perhaps contact point of one second form of the contact point that is one first form.

9. electric resistance touch-control panel as claimed in claim 8, wherein, the contact point of this first form is a small size contact point, and the contact point of this second form is a large tracts of land contact point.

10. electric resistance touch-control panel as claimed in claim 8, wherein, the contact point of this first form is a sticker contact point; And the contact point of this second form is a proficiency finger contact or a palm contact point.

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