KR20100064315A - Appratus and method for recognizing of multi touch point - Google Patents

Abstract

PURPOSE: A multi touch point recognition device and a method thereof are provided to recognize an exact coordinate of a touch point through vibration sensing sensors of an edge of a touch input device, thereby satisfying a face response characteristic. CONSTITUTION: If a touch input unit(110) is touched, a plurality of sensors(121~127) of a vibration sensing unit(120) senses a vibration signal of each touch point. A distance measuring unit(140) measures the distance between a plurality of sensors and the touch point from each of vibration signal. A touch point recognition unit(150) measures a crossing point about the vibration signal according to the measured distance information. The touch point recognition unit recognizes a location of the touch point from a measured crossing point.

Description

Apparatus and method for recognizing of multi touch point

The present invention relates to a multi-touch point recognizing apparatus and a method thereof, and more particularly, to a multi-touch point for recognizing the position of a multi-touch point by attaching a vibration sensor to a corner of the touch input device to detect vibration propagation time of vibration waves. A recognition device and a method thereof are provided.

The present invention is derived from a study conducted as part of the IT source technology development project of the Ministry of Knowledge Economy [Task Management Number: 2006-S-032-03, Task name: Personal Life Log-based intelligent service technology development].

In general, the touch panel refers to a means for inputting a desired item by touching using a finger or a touch pen. Here, the touch panel has a touch screen for inputting desired touch by touching a display device such as an LCD (Liquid Crystal Display), a touch pad mainly used for a notebook, and a digitizer that is frequently used for graphic work. Or tablets.

Such a touch panel may be a capacitive overlay, a pressure sensitive resistive overlay, a surface acoustic wave, or an infrared scanning method depending on the means for recognizing the coordinates. Infrared), piezoelectric method, etc., are mainly used as input device of computer.

The electrostatic capacitive method has a disadvantage in that a finger must be touched in a manner of searching for a capacitance change at a contact point caused by an increase in capacitance of a human body when a hand or a conductor is brought into contact with a panel surface. It is not affected by external factors and has high transparency.

The resistive film type is a method in which a conductive film arranged to coordinates on a pattern designated by a user is switched by contact, thereby touching the touched area. It is a disadvantage that a wound can occur. Resistive touch screen panels are not affected by external factors such as dust and water.

Surface ultrasonic technology uses ultrasonic waves passing over a touch screen panel. Some of the ultrasonic waves are absorbed when the panel is touched and recognize this change in the ultrasonic wave. There are disadvantages to wear.

Finally, the piezoelectric method is a method of calculating the voltage difference generated from the piezoelectric element.

However, in the case of the touch panel as described above, since the sensor must be installed in the entire panel, there is a problem that it is expensive. In addition, since the sensor must be installed in the entire panel, the cost increases as the size increases. Therefore, the cost needs to be reduced.

Recently, a method for solving such a problem has been devised, but a method applied to a plurality of touch points has not been proposed. Therefore, researches have been made on how to recognize the location of each touch point in the case of a plurality of touch points.

An object of the present invention is to provide a multi-touch point recognizing apparatus and method capable of satisfying the requirements of a touch panel such as a simple structure, accurate coordinate recognition, and quick response. There is this.

Another object of the present invention is to provide an apparatus and method for recognizing a multi-touch point capable of recognizing coordinates of a touch point without limiting the size of the touch panel.

Another object of the present invention is to provide an apparatus and method for recognizing a multi-touch point capable of recognizing all of a plurality of touch points when a plurality of touch points are generated at the same time.

The multi-touch point recognizing apparatus according to the present invention for achieving the above object, is disposed on the touch input unit, the touch input unit, when the touch input unit is simultaneously touched by a plurality of touch means, generated from each touch point Vibration sensing unit having a plurality of sensors for detecting a vibration signal, a distance measuring unit for measuring the distance between the plurality of sensors and each touch point from each of the vibration signal detected by the plurality of sensors, and the distance measurement And a touch point recognizing unit measuring an intersection point for each vibration signal according to the distance information measured by the unit, and recognizing a position of each touch point from the measured intersection point.

The touch point recognizing unit generates a plurality of circular trajectories in response to the distance information of each vibration signal measured by the distance measuring unit.

The touch point recognizing unit recognizes a point at which any one circle trajectory centering on each sensor intersects.

The distance measuring unit may measure a distance between the plurality of sensors and each touch point based on a propagation time of the vibration signal.

The distance measuring unit measures a distance between the plurality of sensors and each touch point by using a difference between a time when the touch input unit is touched and a propagation transmission time of a vibration signal.

The apparatus may further include a touch time measuring unit configured to measure a time when the touch input unit is touched by the plurality of touch means. In this case, the touch time measuring unit may measure the touch start time using the capacitance or the conductivity of the electrical signal measured from the touch input unit.

The touch input unit may be formed in a polygonal structure, and in this case, the touch input unit may be formed in a rectangular structure.

The vibration detecting unit is characterized in that the plurality of sensors are disposed on the edge of the touch input unit, respectively.

On the other hand, the multi-touch point recognition method according to the present invention for achieving the above object, when the touch input unit is touched by a plurality of touch means at the same time, the plurality of sensors to detect the vibration signal generated from each touch point Measuring a distance between each of the vibration signals according to the distance information measured in the measuring step, and measuring the distance between the plurality of sensors and each touch point from each of the vibration signals sensed by the plurality of sensors. And recognizing a position of each touch point from the measured intersection point.

The recognizing may include generating a plurality of circular trajectories corresponding to the distance information of each vibration signal measured in the measuring.

The recognizing may include recognizing a point at which any one circle trajectory centering on each sensor intersects.

The measuring may include measuring a distance between the plurality of sensors and each touch point based on a propagation time of the vibration signal.

The measuring may include measuring a distance between the plurality of sensors and each touch point by using a difference between a time when the touch input unit is touched and a propagation transmission time of a vibration signal.

The method may further include measuring a time when the touch input unit is touched by the plurality of touch means.

According to the present invention, it is possible to recognize the coordinates of the touch point as a simple structure of placing the sensor in the corner of the touch input device, and there is an advantage of satisfying fast response.

In addition, the present invention can recognize the coordinates of the touch point without limiting the size of the touch panel, and when a plurality of touch points are generated at the same time, there is an advantage that it is possible to recognize all of the plurality of touch points accurately and quickly.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

1 is a view referred to explain the configuration of a multi-touch point recognition apparatus according to the present invention, Figure 2 is a block diagram showing a schematic configuration of a multi-touch point recognition apparatus according to the present invention.

First, FIG. 1 illustrates a configuration of a touch input unit touched by a user in the multi-touch point recognition apparatus of the present invention. Here, the touch input unit 110 may be a display device. Of course, the present invention is not limited thereto, and any type of touchable elements such as security panels, floor panels such as indoors and outdoors, floor coverings, and the like may be applied anywhere.

As shown in FIG. 1, when a user simultaneously touches a plurality of points on the touch input unit 110 using a hand, sensors disposed at each corner of the touch input unit 110 sense vibration signals from each touch point. . Therefore, the multi-touch point recognition apparatus according to the present invention recognizes the position of the touch point based on the vibration signal detected from each sensor.

According to the present invention, since the sensor does not need to be disposed in the entire touch input unit as in the conventional touch panel, the production cost can be greatly reduced, and there is an advantage that it can be used regardless of the size of the touch input unit.

The configuration of the multi-touch point recognition apparatus illustrated in FIG. 1 will be described in more detail with reference to FIG. 2.

As shown in FIG. 2, the multi-touch point recognizing apparatus according to the present invention includes a touch input unit 110, a vibration sensing unit 120, an A / D converter 130, a distance measuring unit 140, and a touch point. It includes a recognition unit 150.

The touch input unit 110 is formed in a polygonal structure and is preferably configured to have a quadrangular shape. In this case, the size of the touch input unit 110 is not limited and may be variously applied from small to large.

The vibration detector 120 includes a plurality of sensors, that is, a first sensor 121, a second sensor 123, a third sensor 125, and a fourth sensor 127. Each sensor is a vibration detection sensor, and is disposed at each corner of the touch input unit 110 to detect the vibration signal generated when the touch input unit 110 is touched by the user. At this time, each sensor detects all vibration signals generated from each touch point.

The A / D converter 130 converts a signal sensed by each sensor of the vibration detector 120 into a digital signal, and transmits the converted signal to the distance measuring unit 140. In this case, the A / D converter 130 may include a plurality of A / D converters 130, that is, a first A / D converter 131, a second A / D converter 133, and a third A / D converter. The D conversion unit 135 and the fourth A / D conversion unit 137 are provided. In this case, each of the A / D converters 131, 133, 135, and 137 is provided as many as the number of sensors 121, 123, 135, and 127 of the vibration detector 120, and each of the A / D converters 131. , 133, 135, and 137 are connected to correspond to the sensors 121, 123, 135, and 127 of the vibration detector 120.

When a signal is input from each A / D converter 130, the distance measurer 140 measures a propagation propagation time with respect to the signal input for each A / D converter 130. The distance measuring unit 140 measures the propagation propagation time for each signal detected through each A / D converter 130 for each signal detected by each sensor.

On the other hand, the multi-touch point recognition apparatus according to the present invention, in order to measure the propagation time for each vibration signal, the touch time measuring unit 160 for measuring the time when the touch input unit 110 is touched by a plurality of touch means. ) May be further included.

Here, the touch time measuring unit 160 measures the touch start time by using the capacitance or the conductivity of each vibration signal measured when the touch input unit 110 is touched.

Then, the distance measuring unit 140 measures the distance between each sensor and at least two touch points from each of the combined signals. In this case, the distance measuring unit 140 measures the distance by calculating the vibration propagation time of each signal, or measures the distance based on the vibration signal detection time of each sensor from the touch time of the touch input unit 110. Of course, the method of measuring the distance between the sensors from the touch point is not limited to any one method, and can be measured by applying a method of measuring the distance from an existing received signal. In this case, it is assumed that the vibration signal generated from each touch point does not cause signal interference by another signal until it is transmitted to each sensor.

The distance measuring unit 140 transmits the corresponding information to the touch point recognition unit 150 when the distance measurement for each vibration signal detected for each sensor is completed.

When the distance information of the vibration signals for each sensor measured by the distance measuring unit 140 is input, the touch point recognition unit 150 recognizes an intersection point between the vibration signals based on the distance information of each vibration signal.

In this case, the touch point recognition unit 150 generates a plurality of circle trajectories in response to the distance information of each vibration signal measured by the distance measuring unit 140. Here, the touch point recognizing unit 150 recognizes the intersection point of the plurality of circle trajectories, thereby recognizing the intersection point between the vibration signals. In detail, it recognizes a point where all of the circle trajectories corresponding to each sensor cross each other.

For example, when the touch point is 3 in total, the vibration signal generated from each touch point is transmitted to each sensor. Each sensor is input with vibration signals generated by three touch points, respectively. Accordingly, the touch point recognition unit 150 generates a total of 12 circular trajectories in correspondence with the distance information of the three vibration signals for each sensor. In this case, the touch point recognition unit 150 is a point where all the circle trajectories according to the distance information of any one of the vibration signals input to each sensor, that is, if four sensors are provided, sensors A, B, C, Recognize the point where all four circle trajectories centering on D intersect.

In this case, there are a total of three points where all four circle trajectories intersect. The touch point recognition unit 150 recognizes the point where the intersection points as the touch point. Specific embodiments thereof will be described with reference to FIGS. 5 and 8.

An embodiment of the multi-touch point recognition apparatus of the present invention configured as described above will be described with reference to FIGS. 3 to 8.

3 to 5 illustrate examples of two touch points.

First, as shown in FIG. 3, when A and B points of the touch input unit 110 are simultaneously touched, a vibration signal is generated at the touch points A and B. In this case, the generated vibration signal is transmitted to the sensors disposed at each corner of the touch input unit 110.

In other words, the vibration signal generated from the touch point A is transmitted to the first sensor 121, the second sensor, the third sensor 125, and the fourth sensor 127, respectively. At this time, the vibration signal input to the first sensor 121 of the vibration signal generated from the touch point A is NA1, the vibration signal input to the second sensor 123 is NA2. The vibration signal input to the third sensor 125 is NA3, and the vibration signal input to the fourth sensor 127 is NA4.

Similarly, the vibration signal generated from the touch point B is also transmitted to the first sensor 121, the second sensor 123, the third sensor 125, and the fourth sensor 127, respectively. At this time, among the vibration signals generated from the touch point B, the vibration signal input to the first sensor 121 is NB1, and the vibration signal input to the second sensor 123 is NB2, the vibration signal input to the third sensor 125. NB3 and the vibration signal input to the fourth sensor 127 are NB4.

In this case, it is assumed that the vibration signals generated from the touch point A and the touch point B overlap each other and do not interfere with other signals.

4 lists vibration signals input to each sensor.

In other words, signals input to the first sensor 121 are NA1 and NB1. Meanwhile, signals input to the second sensor 123 are NA2 and NB2. Meanwhile, signals input to the third sensor 125 are NA3 and NB3. The signals input to the fourth sensor 127 are NA4 and NB4.

In this case, the distance measuring unit 140 measures the transmission distance of the corresponding signal based on the signal input for each sensor.

That is, the distance measuring unit 140 measures a signal transmission distance for each of the signals NA1 and NB1 input to the first sensor 121. In addition, the distance measuring unit 140 measures a signal transmission distance for each of the signals NA2 and NB2 input to the second sensor 123. Similarly, the distance measuring unit 140 measures a signal transmission distance for each of the signals NA3 and NB3 input to the third sensor 125. Finally, the distance measuring unit 140 measures the signal transmission distance for each of the signals NA4 and NB4 input to the fourth sensor 127.

Thereafter, the distance measuring unit 140 recognizes the touch point recognition result of the distance measurement on the signals input to the first sensor 121, the second sensor 123, the third sensor 125, and the fourth sensor 127, respectively. Transfer to section 150.

The touch point recognizer 150 measures an intersection point according to the distance of each signal based on the distance measurement result transmitted from the distance measurer 140. An embodiment thereof refers to FIG. 5.

As illustrated in FIG. 5, the touch point recognizer 150 generates a circular trajectory for each signal according to the measured distance from the distance measurer 140. In other words, the touch point recognizing unit 150 generates a circle trajectory RA1 according to the distance of the signal NA1 input to the first sensor 121 and a circle trajectory RB1 according to the distance of NB1.

In addition, the touch point recognition unit 150 generates a circle trajectory RA2 according to the distance of the signal NA2 input to the second sensor 123 and a circle trajectory RB2 according to the distance of NB2. In addition, the touch point recognition unit 150 generates a circle trajectory RA3 according to the distance of the signal NA3 input to the third sensor 125 and a circle trajectory RB3 according to the distance of NB3. In addition, the touch point recognition unit 150 generates a circle trajectory RA4 according to the distance of the signal NA4 input to the fourth sensor 127 and a circle trajectory RB4 according to the distance of NB4.

In this case, the touch point recognizing unit 150 includes an intersection point where all circular trajectories corresponding to signals from the first sensor 121, the second sensor 123, the third sensor 125, and the fourth sensor 127 intersect. Check.

That is, the touch point recognizing unit 150 checks the position of the intersection point P where the RA1, RA2, RA3, and RA4 intersect and the intersection point Q where the RB1, RB2, RB3, RB4 intersect. Here, the position of the intersection point P corresponds to the touch point A, and the position of the intersection point Q corresponds to the touch point B.

Thus, when two touch points are given at the same time, the multi-touch point recognition apparatus according to the present invention recognizes the positions of the two touch points A and B by the above method.

On the other hand, Figures 6 to 8 show an example of the case of three touch points, the same applies to the case of three or more touch points.

First, as shown in FIG. 6, when A, B, and C points of the touch input unit 110 are simultaneously touched, vibration signals are generated at the touch points A, B, and C. At this time, the generated vibration signal is transmitted to the sensors disposed at each corner of the touch input unit 110, respectively.

In other words, the vibration signal generated from the touch point A is transmitted to the first sensor 121, the second sensor, the third sensor 125, and the fourth sensor 127, respectively. In this case, all of the vibration signals generated from the touch point A are transmitted to each sensor in the same waveform, but in the embodiment of FIG. 6, the vibration signals input to the first sensor 121 are NA1 and the second sensor 123 for convenience. The input vibration signal is NA2. The vibration signal input to the third sensor 125 is NA3, and the vibration signal input to the fourth sensor 127 is NA4.

Similarly, the vibration signal generated from the touch point B is also transmitted to the first sensor 121, the second sensor 123, the third sensor 125, and the fourth sensor 127, respectively. In this case, all of the vibration signals generated from the touch point B are transmitted to the respective sensors in the same waveform. In the embodiment of FIG. 6, the vibration signals input to the first sensor 121 are transferred to the NB1 and the second sensor 123 for convenience. The input vibration signal is NB2, the vibration signal input to the third sensor 125 is NB3, and the vibration signal input to the fourth sensor 127 is NB4.

Meanwhile, the vibration signal generated from the touch point C is also transmitted to the first sensor 121, the second sensor 123, the third sensor 125, and the fourth sensor 127, respectively. At this time, the vibration signals generated from the touch point C are all transmitted in the same waveform to each sensor, but in the embodiment of FIG. 6, the vibration signals input to the first sensor 121 are sent to the NC1 and the second sensor 123 for convenience. The input vibration signal is NC2, the vibration signal input to the third sensor 125 is NC3, and the vibration signal input to the fourth sensor 127 is NC4.

In this case, it is assumed that the vibration signals generated from the touch points A, B, and C overlap each other so as not to interfere with other signals.

7 lists vibration signals input to each sensor.

In other words, the signals input to the first sensor 121 are NA1, NB1, NC1. Meanwhile, signals input to the second sensor 123 are NA2, NB2, and NC2. Meanwhile, signals input to the third sensor 125 are NA3, NB3, and NC3. On the other hand, signals input to the fourth sensor 127 are NA4, NB4, NC4.

In this case, the distance measuring unit 140 measures the transmission distance of the corresponding signal based on the signal input for each sensor.

That is, the distance measuring unit 140 measures a signal transmission distance for each of the signals NA1 and NB1 input to the first sensor 121. In addition, the distance measuring unit 140 measures a signal transmission distance for each of the signals NA2 and NB2 input to the second sensor 123. Similarly, the distance measuring unit 140 measures a signal transmission distance for each of the signals NA3 and NB3 input to the third sensor 125. Finally, the distance measuring unit 140 measures the signal transmission distance for each of the signals NA4 and NB4 input to the fourth sensor 127.

Thereafter, the distance measuring unit 140 recognizes the touch point recognition result of the distance measurement on the signals input to the first sensor 121, the second sensor 123, the third sensor 125, and the fourth sensor 127, respectively. Transfer to section 150.

The touch point recognizer 150 measures an intersection point according to the distance of each signal based on the distance measurement result transmitted from the distance measurer 140. An embodiment thereof refers to FIG. 8.

As illustrated in FIG. 8, the touch point recognizer 150 generates a circular trajectory for each signal according to the measured distance from the distance measurer 140. In other words, the touch point recognizing unit 150 may determine a circular trajectory RA1 according to the distance of the signal NA1 input to the first sensor 121, a circular trajectory RB1 according to the distance of NB1, and a circular trajectory RC1 according to the distance of NC1. Create In addition, the touch point recognition unit 150 generates a circle trajectory RA2 according to the distance of the signal NA2 input to the second sensor 123, a circle trajectory RB2 according to the distance of NB2, and a circle trajectory RC2 according to the distance of NC2. do.

In addition, the touch point recognition unit 150 generates a circle trajectory RA3 according to the distance of the signal NA3 input to the third sensor 125, a circle trajectory RB3 according to the distance of NB3, and a circle trajectory RC3 according to the distance of NC3. do. In addition, the touch point recognition unit 150 generates a circle trajectory RA4 according to the distance of the signal NA4 input to the fourth sensor 127, a circle trajectory RB4 according to the distance of NB4, and a circle trajectory RC4 according to the distance of NC4. do.

In this case, the touch point recognizing unit 150 includes an intersection point where all circular trajectories corresponding to signals from the first sensor 121, the second sensor 123, the third sensor 125, and the fourth sensor 127 intersect. Check.

That is, the touch point recognizing unit 150 has an intersection X where RA1, RA2, RA3, and RA4 intersect, an intersection Y where RB1, RB2, RB3, RB4 intersect, and an intersection point where RC1, RC2, RC3, RC4 intersect. Check the location of Z. Here, the position of the intersection X corresponds to the touch point A, the position of the intersection Y corresponds to the touch point B, and the position of the intersection Z corresponds to the touch point C.

Thus, even when three touch points are given at the same time, the multi-touch point recognition apparatus according to the present invention recognizes the positions of the three touch points A, B, and C by the above method. Of course, even if more than one touch point is given at the same time, it is possible to recognize all the touch points by the same method.

The operation flow for the multi-touch point recognition method according to the present invention configured as described above is as follows. 9 is a flowchart illustrating an operation flow of a multi-touch point recognition method according to the present invention.

First, when the touch input unit 110 is simultaneously touched by a plurality of touch means (for example, a touch pen or a finger) (S900), a vibration signal is generated from a plurality of touch points. At this time, the first sensor 121 to the fourth sensor 127 disposed at each corner of the touch input unit 110 receive the vibration signals generated from the plurality of touch points (S910).

The signal input to each sensor is converted into a digital signal by the A / D converter 130 in the input order, and is transmitted to the distance measuring unit 140. The distance measuring unit 140 detects a signal transmission time for the vibration signal input to each sensor (S920), and measures the transmission distance for each signal based on the signal transmission time (S930).

At this time, the distance measuring unit 140 outputs the measured distance data to the touch point recognition unit 150 (S960). Therefore, the touch point recognizing unit 150 generates a circle trajectory corresponding to the distance information measured from each vibration signal based on the distance information from the distance measuring unit 140 (S940).

Thereafter, the touch point recognizing unit 150 includes an intersection point where all circular trajectories corresponding to signals from the first sensor 121, the second sensor 123, the third sensor 125, and the fourth sensor 127 intersect. Check (S950).

Finally, the touch point recognition unit 150 recognizes the positions of the plurality of touch points from the intersection point identified in step S950 (S960).

As described above, the apparatus and method for recognizing a multi-touch point according to the present invention are not limited to the configuration and method of the embodiments described as described above, but the embodiments may be modified in various ways. All or some of these may optionally be combined.

1 is a diagram schematically illustrating a configuration of an apparatus for recognizing a multi-touch point according to an exemplary embodiment of the present invention.

2 is a block diagram illustrating a configuration of a multi-touch point recognition apparatus according to an exemplary embodiment of the present invention.

3 to 8 are exemplary views referred to for describing the operation of the multi-touch point recognition apparatus according to an embodiment of the present invention.

9 is a flowchart illustrating an operation flow of a multi-touch point recognition method according to an embodiment of the present invention.

Claims (16)

A multi-touch point recognition device, A touch input unit; A vibration detector disposed on the touch input unit and having a plurality of sensors configured to sense vibration signals generated from each touch point when the touch input unit is simultaneously touched by a plurality of touch means; A distance measuring unit measuring a distance between the plurality of sensors and each touch point from each of the vibration signals sensed by the plurality of sensors; And And a touch point recognition unit measuring an intersection point for each vibration signal according to the distance information measured by the distance measurement unit, and recognizing a position of each touch point from the measured intersection point. Point recognition device. The method according to claim 1, The touch point recognition unit, And generating a plurality of circular trajectories in response to distance information of each vibration signal measured by the distance measuring unit. The method according to claim 2, The touch point recognition unit, The multi-touch point recognition device, characterized in that for recognizing the point where all of the circle trajectory centered on each sensor intersects. The method according to claim 1, The distance measuring unit, And a distance between the plurality of sensors and each touch point is measured based on the propagation time of the vibration signal. The method according to claim 1, The distance measuring unit, And a distance between the plurality of sensors and each touch point by using a difference between a time when the touch input unit is touched and a propagation propagation time of a vibration signal. The method according to claim 1, And a touch time measuring unit measuring a time when the touch input unit is touched by the plurality of touch means. The method according to claim 6, The touch time measuring unit, And a touch start time using a capacitance or a conductivity of the electrical signal measured from the touch input unit. The method according to claim 1, The touch input unit, Multi-touch point recognition device characterized in that formed in a polygonal structure. The method according to claim 8, The touch input unit, Multi-touch point recognition device, characterized in that formed in a rectangular structure. The method according to claim 8, The vibration detection unit, And the plurality of sensors are disposed at edges of the touch input unit, respectively. As a multi-touch point recognition method, Detecting a vibration signal generated from each touch point by a plurality of sensors when the touch input unit is simultaneously touched by a plurality of touch means; Measuring a distance between the plurality of sensors and each touch point from each of the vibration signals sensed by the plurality of sensors; And And measuring an intersection point for each vibration signal according to the measured distance information in the measuring step, and recognizing a position of each touch point from the measured intersection point. The method according to claim 11, Recognizing the step, And generating a plurality of circular trajectories in correspondence with the distance information of each vibration signal measured in the measuring step. The method according to claim 12, Recognizing the step, And recognizing a point at which any one circle trajectory centering on each sensor intersects. The method according to claim 11, The measuring step, And measuring a distance between the plurality of sensors and each touch point based on a propagation time of the vibration signal. The method according to claim 11, The measuring step, And measuring a distance between the plurality of sensors and each touch point by using a difference between a time when the touch input unit is touched and a propagation propagation time of a vibration signal. The method according to claim 11, And measuring a time when the touch input unit is touched by the plurality of touch means.

Images