KR20110118325A - Apparatus and method of detecting touch position in three dimensional space and three dimensional touch screen system having the same - Google Patents

Abstract

The 3D touch position detecting apparatus includes a transmitter, a receiver, and a position detector. The transmitter transmits touch light and ultrasound in a three-dimensional space. The receiver includes a first receiver, a second receiver, and a third receiver that receive touch light and ultrasonic waves from an externally supplied transmitter. The position detector detects the position of the transmitter based on the reception time of the touch light and the ultrasonic waves received at each of the first, second and third receivers. Therefore, the position of the transmitter in three-dimensional space can be detected accurately.

Description

Apparatus and method for three-dimensional touch position detection, and a three-dimensional touch screen system having the same {APPARATUS AND METHOD OF DETECTING TOUCH POSITION IN THREE DIMENSIONAL SPACE AND THREE DIMENSIONAL TOUCH SCREEN SYSTEM HAVING THE SAME}

The present invention relates to an apparatus and method for detecting a three-dimensional touch position, and a three-dimensional touch screen system having the same. More particularly, the apparatus and method for detecting an exact position of a transmitter in a three-dimensional space and And a three-dimensional touch screen system having the same.

Recently, instead of inputting image data and commands such as letters, numbers, and pictures to be displayed on the screen of the display device through a keyboard or a keypad, a touch screen for directly inputting image data and commands by touching the screen is used.

Touch screens are conveniently applied to display devices of subways, automatic teller machines of banks, mobile phones, etc., by allowing a user to conveniently input image data and commands to a display device.

The conventional touch screen is a method of directly touching the screen with an input means such as a hand or a touch pen. When the user inputs image data or a command on the screen using a hand or an input means, the touch screen detects a position contacted with the screen and displays an image according to the detected position.

Therefore, the conventional touch screen can only detect the position on the two-dimensional plane by directly contacting the screen with an input means such as a hand or a touch pen, and there is a problem in that a space constraint of the user who uses the input means is followed.

Accordingly, the technical problem of the present invention has been conceived in this respect, and an object of the present invention is to provide a three-dimensional touch position detection device capable of accurately detecting the position of a transmitter in a three-dimensional space.

Another object of the present invention is to provide a three-dimensional touch position detection method capable of accurately detecting the position of a transmitter in a three-dimensional space.

Another object of the present invention is to provide a three-dimensional touch screen system having the three-dimensional touch position detection device.

3D touch position detection apparatus according to an embodiment for realizing the above object of the present invention includes a transmitter, a receiver and a position detector. The transmitter transmits touch light and ultrasound in a three-dimensional space. The receiver includes a first receiver, a second receiver, and a third receiver that receive the touch light and the ultrasonic wave from the transmitter, which are externally supplied. The position detector detects the position of the transmitter based on reception times of the touch light and the ultrasonic waves received at each of the first, second and third receivers.

In one embodiment of the present invention, the first, second and third receivers may be disposed at different positions on the two-dimensional plane.

In one embodiment of the present invention, the transmitting unit may include a touch light generator for generating the touch light, an ultrasonic generator for generating the ultrasonic wave and a switch for controlling the output of the touch light and the ultrasonic wave in accordance with a user's operation. .

In one embodiment of the present invention, each of the first, second and third receivers may include a touch light receiver for receiving the touch light and an ultrasonic receiver for receiving the ultrasonic wave.

In one embodiment of the present invention, the position detector is a timer for outputting time difference data between the time the touch light is received and the time the ultrasonic wave is received to each of the first, second and third receivers, A distance calculator for outputting distance data from each of the first, second and third receivers to the transmitter based on time difference data, and a position calculator for outputting position data of the transmitter based on the distance data It may include a group.

In the three-dimensional touch position detection method according to another embodiment for realizing the object of the present invention, the first receiver, the second receiver and the third that the touch light transmitted from the transmitter in the three-dimensional space is disposed at different positions Is received at the receiver. Subsequently, ultrasonic waves transmitted from the transmitter are received at each of the first, second and third receivers. Subsequently, the position of the transmitter is detected based on the reception times of the touch light and the ultrasonic waves received by the first, second and third receivers.

In one embodiment of the present invention, time difference data between a time at which the touch light is received and a time at which the ultrasonic wave is received is output to each of the first, second, and third receivers, based on the time difference data. The distance data from each of the first, second and third receivers to the transmitter is output, and the position data of the transmitter is output based on the distance data, thereby detecting the position of the transmitter. .

According to yet another aspect of the present invention, a three-dimensional touch screen system includes a three-dimensional touch position detection device and a display device. The three-dimensional touch position detecting apparatus has a transmitter for transmitting touch light and ultrasound in a three-dimensional space, and a first receiver, a second receiver, and a third receiver for receiving the touch light and ultrasound from the externally supplied transmitter, respectively. And a position detector for outputting position data of the transmitter based on the reception times of the touch light and the ultrasonic waves received at each of the receiver and the first, second and third receivers. The display device is connected to the position detection device and displays an image based on the position data.

In one embodiment of the present invention, the first, second and third receivers may be disposed at different positions on the two-dimensional plane.

In one embodiment of the present invention, the transmitting unit may include a touch light generator for generating the touch light, an ultrasonic generator for generating the ultrasonic wave and a switch for controlling the output of the touch light and the ultrasonic wave in accordance with a user's operation. .

In one embodiment of the present invention, each of the first, second and third receivers may include a touch light receiver for receiving the touch light and an ultrasonic receiver for receiving the ultrasonic wave.

In one embodiment of the present invention, the position detector is a timer for outputting time difference data between the time the touch light is received and the time the ultrasonic wave is received to each of the first, second and third receivers, A distance calculator for outputting distance data from each of the first, second and third receivers to the transmitter based on time difference data, and a position calculator for outputting position data of the transmitter based on the distance data It may include a group.

According to such a three-dimensional touch position detection apparatus and method and a three-dimensional touch screen system having the same, the position of the transmitter in the three-dimensional space can be accurately detected and displayed using touch light and ultrasonic waves, and the user can display Image data or a command may be input at a position spaced apart from the monitor of the device, thereby overcoming a user's space limitation.

1 is a block diagram illustrating an apparatus for detecting a 3D touch position according to an exemplary embodiment of the present invention.
FIG. 2 is a coordinate diagram for describing an operation of the 3D touch position detection apparatus shown in FIG. 1.
3 is a flowchart illustrating a 3D space touch position detection method according to an embodiment of the present invention.
4 is a flowchart illustrating a step of detecting a position of a transmitter illustrated in FIG. 3.
5 is a block diagram illustrating a 3D touch screen system according to an embodiment of the present invention.
FIG. 6 is an exploded perspective view illustrating the three-dimensional touch screen system illustrated in FIG. 5.

As the inventive concept allows for various changes and numerous modifications, the embodiments will be described in detail in the text. However, this is not intended to limit the present invention to the specific form disclosed, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. Like reference numerals are used for like elements in describing each drawing. The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "consist of" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described on the specification, but one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention.

1 is a block diagram illustrating an apparatus for detecting a 3D touch position according to an exemplary embodiment of the present invention.

Referring to FIG. 1, the 3D touch position detecting apparatus 100 includes a transmitter 110, a receiver 130, and a position detector 150.

The transmitter 110 may be an input means for inputting a command or data in the 3D touch position detecting apparatus 100, and transmits the touch light LS and the ultrasound SS in a 3D space.

The receiver 130 receives the touch light LS and the ultrasonic wave SS transmitted by the transmitter 110, and receives at least the touch light LS and the ultrasonic wave SS from the transmitter 110, respectively. It includes three receivers. For example, the receiver 130 may include a first receiver 132, a second receiver 134, and a third receiver 136. The first, second and third receivers 132, 134, and 136 may be disposed at different positions on a two-dimensional plane.

The position detector 150 detects the position of the transmitter 110 based on the reception time of the touch light LS and the ultrasonic wave SS received by the receiver 130. For example, the position detector 150 may use the time differences between the touch light LS and the ultrasound SS to be received at the first, second, and third receivers 132, 134, and 136. The position of the transmitter 110 may be detected.

The transmitter 110 includes a touch light generator 112, an ultrasonic generator 114, a switch 116, and a power generator 118.

The power generator 118 generates power. The switch 116 is located between the touch light generator 112 and the power generator 118 and between the ultrasonic generator 114 and the power generator 118, and a switch control signal SC according to a user's operation. In response, power generated from the power generator 118 is supplied to the touch light generator 112 and the ultrasonic generator 114, respectively. For example, the switch 116 may be a button switch that can turn on / off the power flow of the power generator 118. In addition, the switch 116 may supply the power generated from the power generator 118 to the touch light generator 112 and the ultrasonic generator 114 when the switch control signal SC is at a high level. When the switch control signal SC is at a low level, power generated from the power generator 118 may not be supplied to the touch light generator 112 and the ultrasonic generator 114.

The touch light generator 112 generates touch light LS using the power of the power generator 118 supplied according to the operation of the switch 116, and the ultrasound generator 114 generates the switch 116. Ultrasonic wave SS is generated by using the power of the power generator 118 supplied according to the operation of.

The receiver 130 includes a first receiver 132, a second receiver 134, and a third receiver 136, and each of the first receiver 132, the second receiver 134, and the third receiver ( 136 receives the touch light LS and the ultrasonic wave SS from the transmitter 110. Hereinafter, the second receiver 134 receives the touch light LS and the ultrasonic wave SS received by the first receiver 132 as the first touch light L1 and the first ultrasonic wave S1, respectively. The touch light LS and the ultrasonic wave SS are respectively the second touch light L2 and the second ultrasonic wave S2, and the touch light LS and the ultrasonic wave SS received by the third receiver 136 are respectively. It is called 3rd touch light L3 and 3rd ultrasonic wave S3.

The first receiver 132 includes a first touch light receiver 141 and a first ultrasound receiver 142 to receive the first touch light L1 and the first ultrasound S1, and the second touch light receiver 141. The receiver 134 includes a second touch light receiver 143 and a second ultrasound receiver 144 to receive the second touch light L2 and the second ultrasound S2, and the third receiver 136. ) Includes a third touch light receiver 145 and a third ultrasound receiver 146 to receive the third touch light L3 and the third ultrasound S3.

The first, second and third receivers 132, 134, 136 may be disposed at different positions on a two-dimensional plane projected from a three-dimensional space on which the touch light LS and the ultrasonic wave SS are transmitted. Can be.

The position detector 150 includes a timer 152, a distance calculator 154, and a position calculator 156.

The timer 152 is a difference between the times at which the touch light LS is received and the times at which the ultrasound SS is received at the first, second and third receivers 132, 134, and 136, respectively. Are respectively calculated and output time difference data (TDD).

For example, the timer 152 may receive the touch light LS after receiving the first, second and third receivers 132, 134, and 136, respectively. The time difference data TDD may be output by checking the times at which the ultrasonic wave SS is received by the third receivers 132, 134, and 136.

Since the speed of light is approximately 300,000 km / sec and the speed of ultrasonic waves is approximately 340 m / sec, the times at which the touch light LS is received by the first, second and third receivers 132, 134, and 136 are ultrasonic waves. (SS) is negligible compared to the times at which it is received. That is, the first, second and third receivers 132, 134 and 136 receive the touch light LS at substantially the same time.

In addition, since the first, second, and third receivers 132, 134, and 136 are disposed at different positions, the first, second, and third receivers 132, 134, and 136 are ultrasonic waves (SS). Are different. Accordingly, the timer 152 outputs the time difference data TDD by checking the times at which the ultrasonic wave SS is received at each of the first, second and third receivers 132, 134, and 136.

The distance calculator 154 may be configured based on the time difference data TDD, which are times at which the ultrasonic wave SS is received at the first, second and third receivers 132, 134, and 136. The distance data DD is output by calculating distances from the first, second and third receivers 132, 134, and 136 to the transmitter 110.

The position calculator 156 is configured to transmit the data based on the distance data DD which are distances from the respective first, second and third receivers 132, 134, 136 to the transmitter 110. The location 110 is calculated and the location data PD is output.

FIG. 2 is a coordinate diagram for describing an operation of the 3D touch position detection apparatus shown in FIG. 1.

1 and 2, the transmitter 110 transmits the touch light LS and the ultrasound SS at a touch position (x, y, z) in a three-dimensional space having an X axis, a Y axis, and a Z axis. The first, second and third receivers 132, 134, 136 are disposed at different positions on the XY plane projected from the three-dimensional space. For example, the first receiver 132 is disposed at coordinates (0, 0, 0), the second receiver 134 is disposed at coordinates (3, 0, 0), and the third receiver 136 ) May be located at coordinates (0, 3, 0).

For convenience of explanation, it is assumed that the unit of coordinates shown in FIG. 2 is a meter.

Since the first, second, and third receivers 132, 134, and 136 are disposed at different positions, the first, second, and third receivers receive touch light LS and ultrasonic wave SS from the transmitter 110 at different times. The reception time of the touch light LS is negligible compared to the reception time of the ultrasonic wave SS. That is, the first, second and third receivers 132, 134, and 136 receive the touch light LS at substantially the same time, and receive the ultrasonic waves SS at different times.

For example, assuming that the touch position (x, y, z) is a coordinate (2, 1, 2), the distance from the transmitter 110 to the first receiver 132 is 3m and the second receiver The distance to 134 is about 2.45 m and the distance to the third receiver 136 is about 3.46 m. Accordingly, the first receiver 132 receives the first ultrasonic wave S1 about 8.82 msec after receiving the first touch light L1, and the second receiver 134 receives the second touch light L2. The second ultrasonic wave S2 is received after about 7.20 msec after receiving the), and the third receiver 136 receives the third ultrasonic wave S3 after about 10.18 msec after receiving the third touch light L3. do.

The timer 152 calculates time differences at which the touch light LS and the ultrasonic wave SS are received at the first, second and third receivers 132, 134, and 136, respectively, to calculate the time difference data TDD. Output to the distance calculator 154.

The distance calculator 154 calculates distances from the first, second and third receivers 132, 134, 136 to the transmitter 110 based on the time difference data TDD. The distance data DD is output to the position calculator 156.

For example, based on the time difference data of the first receiver 132 is 8.82msec, calculates that the distance A from the first receiver 132 to the transmitter 110 is 3m, and the second receiver ( The time difference data of the second receiver 134 and the transmitter 110 is 2.45 m based on the time difference data of 134, and the time difference data of the third receiver 136 is 10.18 msec. It can be calculated that the distance C from the third receiver 136 to the transmitter 110 is 3.46 m on the basis of.

The position calculator 156 calculates the position of the transmitter 110 based on the distance data DD and outputs the position data PD.

For example, the distance A from the first receiver 132 to the transmitter 110 is 3 m, and the distance B from the second receiver 134 to the transmitter 110 is 2.45 m. It is possible to generate three quadratic equations as shown in the following equation on the basis of the and the distance (C) from the third receiver 136 to the transmitter 110 is 3.46m.

[Equation]

x ² + y ² + z ² = 3 ²

(x-3) ² + y ² + z ² = 2.45 ²

x ² + (y-3) ² + z ² = 3.46 ²

The position calculator 156 calculates the position of the transmitter 110 by calculating a solution of (x, y, z) in which x = 2, y = 1, z = 2, and calculates the position data PD. Can be output as

3 is a flowchart illustrating a 3D space touch position detection method according to an embodiment of the present invention.

1 to 3, the touch light LS is received from the transmitter 110 through the first, second, and third receivers 132, 134, and 136, respectively (step S110). Each of the first, second and third receivers 132, 134, and 136 receives the touch light LS substantially simultaneously due to the speed of the touch light LS.

Ultrasonic wave SS is received from the transmitter 110 through the first, second, and third receivers 132, 134, and 136, respectively (step S130). Since the first, second, and third receivers 132, 134, 136 are disposed at different positions, the ultrasonic wave SS may be disposed in the first, second, and third receivers 132, 134, 136. The time received is different.

The position detector 150 is based on the times when the touch light LS and the ultrasonic wave SS are received by the first, second and third receivers 132, 134, and 136, respectively. Is detected (step S150).

4 is a flowchart illustrating a step of detecting a position of a transmitter illustrated in FIG. 3.

1 to 4, the timer 152 is a time difference between the touch light LS and the ultrasonic wave SS received by the first, second and third receivers 132, 134, and 136, respectively. The time difference data TDD is outputted (step S152).

The distance calculator 154 calculates distances from the first, second and third receivers 132, 134, 136 to the transmitter 110 based on the time difference data TDD. The distance data DD is output (step S154).

The position calculator 156 calculates the position of the transmitter 110 based on the distance data DD and outputs the position data PD (step S156).

Therefore, the 3D touch position detecting apparatus and the 3D touch position detecting method according to the present invention can accurately detect the position of the touch pen positioned in the 3D space using three receivers arranged on the 2D plane.

FIG. 5 is a block diagram illustrating a 3D touch screen system according to an exemplary embodiment of the present invention, and FIG. 6 is an exploded perspective view illustrating the 3D touch screen system illustrated in FIG. 5.

5 and 6, the 3D touch screen system 1000 includes a 3D touch position detection device 100 and a display device 900.

The 3D touch position detection apparatus 100 shown in FIGS. 5 and 6 is substantially the same as the 3D touch position detection apparatus 100 shown in FIG. 1. Therefore, the same members as those shown in FIG. 1 are denoted by the same reference numerals, and redundant descriptions may be omitted.

The display device 900 includes a display unit 200 and a backlight assembly 500 formed under the display unit 200.

The display unit 200 includes a liquid crystal display panel 210 for displaying an image, a gate driver 310 for applying a gate signal to the liquid crystal display panel 210, and a data driver for applying a data signal to the liquid crystal display panel 210. 410.

The liquid crystal display panel 210 includes an array substrate 212, a color filter substrate 214, and a liquid crystal (not shown) interposed between the array substrate 212 and the color filter substrate 214.

The gate driver 310 is a gate flexible circuit film connecting the gate printed circuit board 312, the gate printed circuit board 312, and the liquid crystal display panel 210 to receive a gate signal from a timing controller (not shown). 314 and a gate driving chip 316 for applying a gate signal provided from the gate printed circuit board 312 to the liquid crystal display panel 210 in response to a timing signal.

The data driver 410 is a data flexible circuit film connecting the data printed circuit board 412, the data printed circuit board 412, and the liquid crystal display panel 210 to receive a data signal from a timing controller (not shown). 414 and a data driver chip 316 for applying a data signal provided from the data printed circuit board 412 to the liquid crystal display panel 210 in response to a timing signal.

The backlight assembly 500 includes a lamp unit 510 for generating light, a light guide plate 520 for guiding the light emitted from the lamp unit 510 to the liquid crystal display panel 210, and the light guide plate 520. And an optical sheet 530 formed between the liquid crystal display panel 210 to improve optical characteristics, and a reflecting plate 540 reflecting light leaked from the light guide plate 520 toward the light guide plate 520.

The display device 900 may further include the display unit 200, a lower storage container 600, and an upper storage container 700 that accommodate the backlight assembly 500.

The 3D touch position detecting apparatus 100 includes a transmitter 110, a receiver having first, second, and third receivers 132, 134, and 136, and a position detector 150.

The transmitter 110 may be an input means for inputting a command or data in the 3D touch screen system 1000, and transmits touch light and ultrasound in a 3D space. For example, the transmitter 110 may have a form such as a touch pen.

The first, second and third receivers 132, 134, and 136 may be disposed at different positions on the liquid crystal display panel 210 having a planar shape. For example, each of the first, second, and third receivers 132, 134, and 136 may be disposed at three corners of four corners of the liquid crystal display panel 210.

The position detector 150 may be connected to the data driver 410. For example, the position detector 150 may be disposed on the data printed circuit board 412. The position detector 150 may output the position data PD for calculating the position of the transmitter 110 to the data driver 410. The data driver 410 receiving the position data PD applies the position data PD to the liquid crystal display panel 210, and the liquid crystal display panel 210 corresponds to the position data PD. Display the video.

Therefore, the three-dimensional touch screen system according to the present invention can accurately detect and display the position of the touch pen in the three-dimensional space, and thus display characters, numbers, and pictures according to the movement of the position of the touch pen in the three-dimensional space. Can be.

As described above, according to the present invention, it is possible to accurately detect and display the position of the transmitter in the three-dimensional space, and images such as letters, numbers, and pictures according to the movement of the position of the transmitter in the three-dimensional space. The data can be displayed.

Therefore, the user can input image data or a command at a position spaced apart from the monitor of the display device, thereby overcoming the spatial constraints of the user using the input means.

That is, according to the present invention, if the 3D is supported, the touch position is detected even though the display panel is not directly contacted, thereby realizing various applications or smooth operations. For example, the zoom in / zoom out function may be implemented by placing the position of a transmitter, such as a touch pen, near or away from the receivers. In addition, when the image displayed on the display panel where the receivers are arranged is displayed in the shape of a ball or a fruit, it is possible to access children's play. For example, when an apple and a basket are displayed as an image on a display panel on which receivers are arranged, the transmitter is disposed at a position corresponding to the apple from an observer's point of view to generate touch light and ultrasonic waves, and then the transmitter corresponds to the basket. By changing the position of and generating touch light and ultrasonic waves, it is possible to implement the action of putting apples in the basket on the displayed image. Of course, it can be applied to a variety of games, such as basketball, as well as preschool children.

Although described above with reference to the embodiments, those skilled in the art can be variously modified and changed within the scope of the present invention without departing from the spirit and scope of the invention described in the claims below. I can understand.

110: transmitter 130: receiver
150: position detection unit 132, 134, 136: receiver
112: touch light generator 114: ultrasonic generator
116: switches 141, 143, and 145: touch light receiver
142, 144, and 146: ultrasonic receiver 152: timer
154: distance calculator 156: position calculator

Claims (12)

A transmitter for transmitting touch light and ultrasound in a three-dimensional space;
A receiver including a first receiver, a second receiver, and a third receiver for receiving the touch light and the ultrasonic wave from the transmitter, which are externally supplied; And
And a position detector for detecting a position of the transmitter based on the reception times of the touch light and the ultrasonic waves received at each of the first, second, and third receivers. The apparatus of claim 1, wherein the first, second, and third receivers are disposed at different positions on a two-dimensional plane. The method of claim 1, wherein the transmitting unit,
A touch light generator for generating the touch light;
An ultrasonic generator for generating the ultrasonic waves; And
And a switch for controlling the output of the touch light and the ultrasonic wave according to a user's operation. The method of claim 1, wherein each of the first, second and third receivers,
A touch light receiver to receive the touch light; And
And an ultrasonic receiver for receiving the ultrasonic waves. The method of claim 1, wherein the position detection unit,
A timer for outputting time difference data between the time when the touch light is received and the time when the ultrasonic wave is received, to the first, second and third receivers, respectively;
A distance calculator configured to output distance data from each of the first, second and third receivers to the transmitter based on the time difference data; And
And a position calculator for outputting position data of the transmitter based on the distance data. Receiving touch light transmitted from a transmitter in a three-dimensional space by using a first receiver, a second receiver, and a third receiver disposed at different positions;
Receiving ultrasonic waves transmitted from the transmitter using the first, second and third receivers; And
And detecting the position of the transmitter based on the reception times of the touch light and the ultrasonic wave received at each of the first, second and third receivers. The method of claim 6, wherein detecting the position comprises:
Outputting time difference data between a time at which the touch light is received and a time at which the ultrasonic wave is received, to the first, second, and third receivers;
Outputting distance data from the respective first, second and third receivers to the transmitter based on the time difference data; And
And outputting position data of the transmitter on the basis of the distance data. A transmitter for transmitting touch light and an ultrasonic wave in a three-dimensional space, a receiver having a first receiver, a second receiver, and a third receiver for receiving the touch light and the ultrasonic wave from an externally supplied transmitter, respectively, and the first and second receivers. And a position detector for outputting position data of the transmitter based on the reception times of the touch light and the ultrasonic waves received at each of the third receivers. And
And a display device connected to the three-dimensional touch position detection device and displaying an image based on the position data. The three-dimensional touch screen system of claim 8, wherein the first, second and third receivers are disposed at different positions on a two-dimensional plane. The method of claim 8, wherein the transmitting unit,
A touch light generator for generating the touch light;
An ultrasonic generator for generating the ultrasonic waves; And
And a switch controlling the output of the touch light and the ultrasonic wave according to a user's operation. The method of claim 8, wherein each of the first, second, and third receivers,
A touch light receiver to receive the touch light; And
And an ultrasonic receiver for receiving the ultrasonic waves. The method of claim 8, wherein the position detection unit,
A timer for outputting time difference data between the time when the touch light is received and the time when the ultrasonic wave is received, to the first, second and third receivers, respectively;
A distance calculator configured to output distance data from each of the first, second and third receivers to the transmitter based on the time difference data; And
And a position calculator configured to output position data of the transmitter based on the distance data.

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