KR20070119375A - Method of discerning a touch coordinate and touch screen device performing the same - Google Patents

Abstract

A method for recognizing touch coordinates and a touch screen device for performing the same are provided to reduce weight, thickness, and a cost of a display device applying the touch screen device by recognizing the touch coordinates through a line image sensor without installing a medium such as a glass plate to the touch screen device. An image collector(210) is equipped with sensors(S1-S4) arranged to each corner of a screen and captures the image according to a touch. A touch coordinate calculator(220) calculates the touch coordinates by removing noise from the captured images. A touch driver(230) provides the touch coordinates to the display device for displaying the touch coordinates to the screen. The touch coordinate calculator includes an ADC(Analog/Digital Converter)(221) converting image signals received from the image sensors into a digital image signal, a noise filter(222) outputting a plurality of line images by filtering the noise from the digital image signals, an image processor(223) extracting one point from each line images, and a position estimator(226) estimating the position from the points extracted from the different line images.

Description

METHOD OF DISCERNING A TOUCH COORDINATE AND TOUCH SCREEN DEVICE PERFORMING THE SAME}

FIG. 1A is a conceptual diagram for schematically describing a touch screen device according to the present invention, and FIGS. 1B and 1C are diagrams for explaining line images detected by the third and fourth line image sensors shown in FIG. 1A, respectively. .

2A is a conceptual diagram for conceptually describing a touch screen device according to a first embodiment of the present invention, and FIG. 2B is a plan view illustrating a side planar area covered by the first and second line image sensors illustrated in FIG. 2A. 2C is a conceptual diagram illustrating a process of extracting coordinate values from line images sensed by the first and second line image sensors of FIG. 2B.

3 is a flowchart for conceptually explaining a coordinate recognition method according to an embodiment of the present invention.

4A and 4B are images before the preprocessing step and images after the preprocessing step shown in FIG. 3.

5 is a block diagram illustrating a touch screen device according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

100 and 200: touch screen device 210: image collector

220: touch coordinate calculation unit 221: analog-to-digital conversion unit

222: image noise removing unit 223: image processing unit

224: automatic image reading unit 225: tracking filtering unit

226: position estimator 230: touch driver

S1, S2, S3, S4: Line Image Sensor SUB: Base

The present invention relates to a touch coordinate recognition method and a touch screen device for performing the same, and more particularly, to a touch coordinate recognition method using an image and a touch screen device for performing the same.

Generally, a touch screen device detects the location of a person's hand or an object by touching a character or a specific location on the screen (screen) without using a separate key input device (for example, a keyboard). It is an interactive system that can receive input data directly from the screen for specific processing.

The touch screen device is classified into a resistive method, a capacitive method, and an infrared method. The resistance method has a disadvantage in that the screen is not clean by attaching a thin film to the glass plate. The capacitive method has a disadvantage in that it does not recognize any medium other than the operator's hand.

On the other hand, the infrared method is to add a device called a touch panel (panel) to the screen portion of the general monitor to perform a function, the touch panel to the left / right / up / down invisible infrared flows to the screen portion By creating a large number of square grids, they have the ability to locate their location when they touch the grid with a fingertip or other object.

Therefore, when a character or picture information previously displayed on the display device equipped with the touch panel is touched by hand, the user may determine what the user has selected according to the position of the screen displayed on the touched display device, and provide a corresponding command. You can do it with a computer so that you can get the information you want very easily.

Due to this characteristic of the touch screen device, it is widely used for guiding software in places that are widely used by the public, that is, subways, department stores, banks, and the like. have.

However, in order to implement a conventional touch screen device, it is cumbersome to attach a touch panel including a separate transparent substrate on the display device. Due to the attachment of the touch panel, there is a problem in that the thickness of the display device becomes thick and heavy, and manufacturing costs also increase.

Accordingly, the technical problem of the present invention is to solve such a conventional problem, and an object of the present invention is to provide a touch coordinate recognition method using an image.

Another object of the present invention is to provide a screen device for performing the above touch coordinate recognition method.

In order to realize the above object of the present invention, a coordinate recognition method according to one feature is disposed on a display screen and uses a touch screen device that calculates touch coordinates according to the operator's touch and provides the display device to display the screen. In the coordinate recognition method, collecting two or more video signals corresponding to the touch moment of the screen, removing noise included in the video signals, and processing the noise-removed video signal corresponding to the touch position Calculating touch coordinates.

The coordinate recognition method may include removing noise from the captured image and checking whether a drawing occurs, and if the drawing occurs, performing tracking filtering to smooth the drawing image, and performing the smoothing process. Estimating a touch position from the captured image.

In order to realize the above object of the present invention, a touch screen device according to one feature is disposed on a display screen to extract touch coordinates according to the touch of an operator. 4 image sensors and a touch coordinate calculator. The first to fourth image sensors are disposed at each corner of the display screen. The touch coordinate calculator calculates a touch point from images provided by the image sensors as a touch is generated on the display screen.

Here, the display screen includes first, second, third and fourth side plane regions divided by diagonal lines connecting the image sensors, each of the side plane regions being opposed by two image sensors. It is characterized by being covered.

(여기서, L1은 제1 영상센서와 제2 영상센서간의 길이이고, m은 제1 포인트와 제2 영상센서간의 길이이며, n은 제2 포인트와 제1 영상센서간의 길이)에 의해 산출되는 것을 특징으로 한다. In addition, the first and second image sensors covering the side plane including the touch point, and the first point and the second image where a line connecting the first image sensor and the touch point meet one side of the display screen. When defining a second point where a line connecting a sensor and the touch point meets the other side facing the one side, each of the x and y coordinates of the touch point is

Where L1 is the length between the first image sensor and the second image sensor, m is the length between the first point and the second image sensor, and n is the length between the second point and the first image sensor. It features.

The image sensor may photograph an area corresponding to a line.

The image sensor may be a line scan camera.

The image sensor is characterized by having a shooting speed of 30 frames or more per second.

According to another aspect of the present invention, a touch screen device according to another aspect is disposed on a display screen and extracts touch coordinates according to the touch of an operator. It includes a touch driver. The image collecting unit includes two or more image sensors disposed on the same plane, and captures an image according to the touching. The touch coordinate calculator calculates touch coordinates by removing noise from two or more captured images. The touch driver provides the touch coordinates to the display device.

The touch coordinate calculator includes an analog-digital converter for digitally converting a plurality of image signals provided from each of the image sensors through different channels, and each of the digitally converted image signals provided through different channels. An image noise remover for outputting a plurality of line images by removing a noise component included in the image signal, an image processor extracting one point from each of the line images, and a point extracted from different line images by the image processor And a position estimator for estimating a position according to the image for each channel from the apparatus.

Here, the touch screen device is provided with the extracted one point through different channels, the automatic image reading unit for determining whether to draw the touch operation from the points provided for a different time through a specific channel, and In the case where the automatic image reading unit determines the drawing, it is preferable to further include a tracking filtering unit which traces the drawn images and smoothes the traced images.

According to such a coordinate recognition method and a touch screen device for performing the same, images according to a touch operation are collected from at least two image sensors disposed on a display screen, and touch coordinates corresponding to the touch are collected from the collected images. I can recognize it.

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

FIG. 1A is a conceptual diagram for schematically illustrating a touch screen device according to the present invention, and FIGS. 1B and 1C are diagrams for explaining line images detected by the third and fourth line image sensors shown in FIG. 1A, respectively. admit.

Referring to FIG. 1A, the touch screen device 100 according to the present invention may include a base unit SUB, a first line image sensor S1, a second line image sensor S2, a third line image sensor S3, and the like. And a fourth line image sensor S4. Here, the first to fourth line image sensors S1 to S4 are image collectors which collect images corresponding to the touching operation on the base unit SUB, and use the images collected by the image collectors. A series of operations for recognizing touch coordinates is performed in FIG. 5 to be described later.

The base portion SUB has a quadrangular shape and supports the first to fourth line image sensors S1 to S4 attached to the corner region. The base portion SUB is preferably the outermost substrate of the display device, but may be a separate glass substrate.

The first line image sensor S1 is disposed at lower and left corners of the base portion SUB, and captures an image on the surface of the base portion SUB, and uses the touch coordinate calculation unit (not shown). To provide.

The second line image sensor S2 is disposed at lower and right corners of the base part SUB to capture an image on the surface of the base part SUB and provide the captured image to the touch coordinate calculator. do.

The third line image sensor S3 is disposed at an upper / left corner area of the base part SUB to capture an image on the surface of the base part SUB, and provide the captured image to the touch coordinate calculator. do.

The fourth line image sensor S4 is disposed at an upper / right corner area of the base part SUB to capture an image on the surface of the base part SUB, and provide the captured image to the touch coordinate calculator. do. The first to fourth line image sensors S1 to S4 preferably have a photographing angle of up to 90 degrees and a maximum resolution of 2048 pixels.

Here, when the first to fourth line image sensors S1 to S4 have a photographing angle of about 90 degrees, the length of the image photographed by the first to fourth line image sensors S1 to S4 is substantially the same. The diagonal length of the base part SUB.

In addition, the photographed image may be a color type, but is preferably a mono type, and the frame is preferably at least 30 per second.

For example, when a touching operation occurs at a specific position TO of the left / upper side of the base SUB, an image captured by the third line image sensor S3 is as shown in FIG. 1B. It has one band shape. In addition, the image photographed by the fourth line image sensor S4 has a band shape as illustrated in FIG. 1C.

As such, the first to fourth line image sensors S1 to S4 disposed at each of the four corners capture the image of the touch moment and perform image processing, and calculate the position of the touch based on the processed image signal. In particular, when a drawing is generated, a separate tracking filtering is performed to accurately detect the touch movement. The drawing refers to the movement of the touch point.

In operation, the area on the actual screen is continuously photographed by the first to fourth line image sensors S1 to S4, and the touch position is accurately determined by processing the touch image at the moment when the touch is made on the screen.

As described above, the touch screen device according to the present invention does not require a medium such as the transparent glass plate used in the existing touch screen device by using the line image sensor, and displays a separate medium such as the transparent glass plate. It is easy to install because it does not need to be attached to the screen.

In addition, since the image captured by the line image sensor is used, the size of the display screen is not limited.

FIG. 2A is a conceptual diagram for conceptually describing a touch screen device according to an embodiment of the present invention, and FIG. 2B is a plan view illustrating a side planar area covered by the first and second line image sensors illustrated in FIG. 2A. 2C is a conceptual diagram illustrating a process of extracting coordinate values from line images sensed by the first and second line image sensors of FIG. 2B.

Referring to FIG. 2A, a touch screen device according to an exemplary embodiment may include a base unit SUB, a first line image sensor S1, a second line image sensor S2, and a third line image sensor S3. And a fourth line image sensor S4.

The base portion SUB has a quadrangular shape and supports the first to fourth line image sensors S1 to S4 attached to the corner region. The base SUB is divided into first, second, third and fourth side planar regions RE1, RE2, RE3, and RE4 by a kind of diagonal line connecting the first to fourth line image sensors to each other. .

That is, when viewed in a plan view, the first side planar region RE1 has an isosceles triangle shape disposed in the lower direction, and the second side planar region RE2 has an isosceles triangle shape arranged in the right direction. The third side planar region RE3 has an isosceles triangle shape disposed in the left direction, and the fourth side planar region RE4 has an isosceles triangle shape arranged in the upper direction.

The base portion SUB is preferably the outermost substrate of the display device, but may be a separate glass substrate.

The first line image sensor S1 has a first photographing angle θ1 observed from the second line image sensor S2 to the fourth line image sensor S4, and is lower than the base portion SUB. It is disposed in the left corner region, the image on the surface of the base portion (SUB), and provides the captured image to the touch coordinate calculation unit (not shown). Therefore, the first line image sensor S1 captures an image detected on the first side planar region RE1 and the second side planar region RE2.

The second line image sensor S2 has a second photographing angle θ2 observed from the first line image sensor S1 to the third line image sensor S3, and is lower than the base portion SUB. It is disposed in the right corner region, the image on the surface of the base portion (SUB), and provides the captured image to the touch coordinate calculation unit. Therefore, the second line image sensor S2 captures an image detected on the first side planar region RE1 and the third side planar region RE3.

The third line image sensor S3 has a third photographing angle θ3 observed from the second line image sensor S2 to the fourth line image sensor S4. It is disposed in the upper corner area, the image on the surface of the base portion (SUB), and provides the captured image to the touch coordinate calculation unit. Accordingly, the third line image sensor S3 captures an image detected on the fourth side planar region RE4 and the second side planar region RE2.

The fourth line image sensor S4 has an image of the base portion SUB having a fourth photographing angle θ4 observed from the first line image sensor S1 to the third line image sensor S3. It is disposed in the right corner region, the image on the surface of the base portion (SUB), and provides the captured image to the touch coordinate calculation unit. Therefore, the fourth line image sensor S4 captures an image detected on the third side planar region RE3 and the fourth side planar region RE4.

Accordingly, the touch point existing in the first side plane area RE1 may calculate coordinate values from the images captured by the first and second line image sensors S1 and S2, and the second side plane area ( The touch point present in RE1 may calculate a coordinate value from images captured by the first and third line image sensors S1 and S3.

In addition, the touch point existing in the third side plane area RE3 may calculate a coordinate value from the images photographed by the second and fourth line image sensors S2 and S4, and the fourth side plane area. The touch point present in RE4 may calculate a coordinate value from images captured by the third and fourth line image sensors S3 and S4.

Next, as illustrated in FIG. 2, a process of calculating a coordinate value calculated when a touch point exists in the first side plane area RE1 will be described with reference to FIG. 2C. In particular, the lengths of the long sides and short sides of the base portion SUB are assumed to be 4 and 3 for convenience of description.

In addition, the positions of the first, second, third and fourth line image sensors S1 to S4 are set to (0,0), (4,0), (0,3) and (4,3). A series of processes for calculating the coordinates of the touch point TO will be described by assuming that each point TO generated a touch in the first side planar region RE1 is (x, y).

When the touch point TO is detected, a first right triangle having a height of m and a height are made common by the length defined by the first line image sensor S1 and the second line image sensor S2 as a base. A second right triangle with n is defined. Since the touch point TO exists at the hypotenuse of the first right triangle, the first line image sensor S1 and the touch point TO and the touch point TO have an x coordinate similar to the first right triangle. A third right triangle is defined.

In addition, since the touch point TO exists at the hypotenuse of the second right triangle, the second right triangle and the second right triangle are formed by the x-coordinate of the second line image sensor S2, the touch point TO, and the touch point TO. A fourth right triangle of similar shape is defined.

Since the first right triangle and the third right triangle are similar to each other, the x-coordinate of the touch point TO existing on the hypotenuse of the first right triangle and the first line image sensor S1 and the second line image sensor ( The ratio of the length between S2) may be summarized by Equation 1 below in proportion to the ratio of the y coordinate of the touch point TO and the height of the first right triangle.

[Equation 1]

In addition, since the second rectangular quadrangle and the fourth rectangular triangle resemble each other, the length between the x-coordinate of the second line image sensor S2 and the touch point TO, and the first line image sensor S1 and The ratio of the lengths between the second line image sensors S2 may be summarized by Equation 2 below in proportion to the ratio of the y coordinate of the touch point TO to the height of the second right triangle.

[Equation 2]

If y is summarized for each of Equations 1 and 2, respectively, Equations 3 and 4 are described below.

[Equation 3]

[Equation 4]

If x is summarized for each of Equations 3 and 4, it is as Equation 5 below. [Equation 5]

X in Equation 5 is an x coordinate value of the touch point TO. That is, the sum L1 of the length between the first line image sensor S1 and the second line image sensor S2 is already known as a fixed value, and the height n of the second right triangle is represented by the second line. It can be inferred from the image taken by the image sensor S2, and the height m of the first right triangle can be inferred from the image taken by the first line image sensor S1, so that the x of the touch point TO Coordinate values can be calculated.

On the other hand, the sum of each of the above equations (1) and (2) by x is the same as the following equations (6) and (7).

[Equation 6]

[Equation 7]

When y is summarized for each of Equations 6 and 7, it is the same as Equation 8 described below.

[Equation 8]

Y in Equation 8 is the y coordinate value of the touch point TO. That is, the height n of the second right triangle may be inferred from the image photographed by the second line image sensor S2, and the height m of the first right triangle may be the first line image sensor S1. Since it can be inferred from the image photographed at, the y coordinate value of the touch point TO can be calculated.

In this embodiment, four image sensors were used. Because the existing image sensor has an angle of view of about 60 degrees or less, it is necessary to attach a separate lens to widen the angle of view. Therefore, an embodiment has been described in which four image sensors respectively capture images within 45 degrees. In addition, it is apparent that the number of image sensors may vary depending on the angle of view of the image sensor.

3 is a flowchart for conceptually explaining a coordinate recognition method according to an embodiment of the present invention. 4A and 4B are images before the preprocessing step and images after the preprocessing step shown in FIG. 3.

Referring to FIG. 3, a touch instant image is captured to monitor a display screen (step S110).

Subsequently, a preprocessing process is performed to remove image noise from the display screen (step S120). The preprocessing process refers to a process of extracting one image from a plurality of frame images.

For example, when a line scan camera is used as the line image sensor, the noise component included in each frame may be removed from the monitored screen by performing the preprocessing process. The line scan camera photographs an area substantially corresponding to the line.

On the other hand, when using a general camera as a line image sensor, by performing the pre-processing process to remove the remaining images other than the image corresponding to the line component from the three-dimensionally captured image, and included in every frame in the image of the line component Noise components can be eliminated.

For example, the image photographed before the preprocessing includes an image which is out of the base part because the camera is disposed with a certain height from the base part as shown in FIG. 4A. Therefore, only the image corresponding to the specific side plane photographed by the camera is extracted. That is, as shown in FIG. 4B, the remaining images except for the image included in the triangle connecting the first, second and fourth line image sensors S1, S2, and S4 are removed.

As an example of the preprocessing process, the noise component may be removed by a method of finding a center point through edge image processing. In addition, as another example of the preprocessing process, the noise component may be removed by a method of finding the center point of the corresponding contour line through the contour extraction.

Subsequently, the image is processed by an image signal processing process for finding a touch position (step S130). That is, the image processing process is a process of extracting one point from the extracted one image. In the present exemplary embodiment, when a touch action is performed on a base part divided into four side plane areas, two points are extracted from an image captured by two line image sensors among four line image sensors.

Then, the existence of the drawing is checked (step S140). That is, if the coordinates of the touch point are fixed for a certain number of frames, no drawing is checked, and if a plurality of coordinates is detected, the drawing is checked.

If it is checked in step S140 that the drawing exists, a trace filtering process for tracking the drawn images and obtaining a desired image from the traced image is performed (step S150).

Here, the tracking filtering process may be performed by smoothing an image displayed by applying the Kalman filtering technique, that is, an image displayed on the display device in response to a touch action. In general, when the user manipulates the touch screen device, the user may move and operate the touch screen device. Even when the user operates the touch screen device, the user may touch the specific position and then touch the other position. The other position passing in the middle is regarded as a kind of unnecessary image, and a technique for removing the image is required.

Subsequently, after performing the tracking filtering process or when the drawing does not exist, the touch position is estimated based on the result of image processing (step S160).

The coordinate value corresponding to the touch position estimated in step S160 is output to the touch driver (step S170).

5 is a block diagram illustrating a touch screen device according to an embodiment of the present invention.

Referring to FIG. 5, the touch screen device 200 according to an embodiment of the present invention includes an image collector 210, a touch coordinate calculator 220, and a touch driver 230.

The image collecting unit 210 includes two or more image sensors disposed in an edge region of the display screen, and captures an image according to the touching. The image collecting unit 210 includes the first to fourth line image sensors S1 to S4 disposed in the corner region of the display screen as described with reference to FIGS. 1A to 2C.

The touch coordinate calculator 220 includes an analog-digital converter 221, an image noise remover 222, an image processor 223, an automatic image reader 224, a tracking filter 225, and a position estimator. In operation 226, noise is removed from two or more images captured by the image collector 210 to calculate touch coordinates, and then provide the touch coordinates to the touch driver.

In detail, the analog-digital converter 221 digitally converts a plurality of image signals provided from each of the image sensors via different channels.

The image noise remover 222 removes a noise component included in each of the digitally converted image signals provided through different channels and outputs a plurality of line images.

The image processor 223 extracts one point from each of the line images.

As the extracted one point is provided through different channels, the automatic image reading unit 224 determines whether the drawing operation is drawn from the points provided for different times through a specific channel.

The trace filtering unit 225 tracks the images to be drawn when the automatic image reading unit 224 determines the drawing, and smoothes the traced images.

The position estimator 226 determines a position according to an image for each channel from a point extracted from a different line image by the image processor 223 or a point extracted from an image smoothed by the trace filtering unit 225. Estimate.

The touch driver 230 provides the touch coordinates to a display device displaying a screen.

As described above, according to the present invention, since the touch coordinates are recognized by using the line image sensor, a medium such as a transparent glass plate used in a conventional touch screen device is unnecessary, and a separate medium such as the transparent glass plate is used as a conventional display screen. Easy to install since there is no need to attach to Therefore, the thickness, weight, and the like of the display device employing the touch screen device can be reduced, and since a separate medium is unnecessary, manufacturing cost can be reduced.

In addition, the display device may be used regardless of the size of the display device, and particularly, may be easily applied to a large size screen that is not provided by the existing touch screen.

In addition, since the image captured by the line image sensor is used, the size of the display screen is not limited. In addition, by using an image captured by the line image sensor, a separate calculation process corresponding to the drawing is performed, thereby having excellent drawing performance.

In addition, conventionally, the cost problem according to the size is the largest, there is a disadvantage that the manufacturing cost in implementing a touch panel corresponding to a large screen is expensive, the touch method using an image according to the present invention is applicable to a screen of various sizes In addition, the limitation on the size of the existing touch can be removed.

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

Claims (16)

In the touch coordinate recognition method using a touch screen device disposed on the display screen to calculate the touch coordinates according to the operator's touch to provide to the display device for displaying the screen, Collecting two or more image signals corresponding to a touch moment of the screen; Removing noise included in the image signals; And And processing the noise canceled image signal to calculate touch coordinates corresponding to the touch position. The method of claim 1, wherein after the noise is removed from the captured image, Checking whether a drawing occurs; Performing tracking filtering to smooth the drawing image when it is checked that the drawing has occurred; And And estimating a touch position from the smoothed image. In the touch screen device disposed on the display screen to extract the touch coordinates according to the operator's touch, First, second, third, and fourth image sensors disposed at corners of the display screen; And And a touch coordinate calculator configured to calculate a touch point from the images provided by the image sensors as a touch is generated on the display screen. The display apparatus of claim 3, wherein the display screen comprises first, second, third, and fourth side planar regions divided by diagonal lines connecting the image sensors. And wherein each of the side planar regions is covered by two opposing image sensors. The display apparatus of claim 4, wherein the first and second image sensors covering the side plane including the touch point, and the first point where a line connecting the first image sensor and the touch point meet one side of the display screen; When the line connecting the second image sensor and the touch point defines a second point that meets the other side facing the one side, Each of the x and y coordinates of the touch point

Where L1 is the length between the first image sensor and the second image sensor, m is the length between the first point and the second image sensor, and n is the length between the second point and the first image sensor. Touch screen device, characterized in that. The touch screen device of claim 3, wherein the image sensor captures an area corresponding to a line. The touch screen device of claim 3, wherein the image sensor is a line scan camera. The touch screen device of claim 3, wherein the image sensor has a shooting speed of 30 frames or more per second. In the touch screen device disposed on the display screen to extract the touch coordinates according to the operator's touch, An image collecting unit including two or more image sensors disposed at an edge of the display screen and capturing an image according to the touching; A touch coordinate calculator to remove noise from the captured two or more images to calculate touch coordinates; And And a touch driver for providing the touch coordinates to a display device displaying the screen. The method of claim 9, wherein the touch coordinate calculator, An analog-to-digital converter for digitally converting a plurality of image signals provided from each of the image sensors via different channels; An image noise removing unit for outputting a plurality of line images by removing noise components included in each of the digitally converted image signals provided through different channels; An image processor extracting one point from each of the line images; And And a position estimator for estimating a position according to an image for each channel from points extracted from different line images by the image processor. The touch screen device as claimed in claim 10, wherein the plurality of line images are line images from which noise of each image frame is removed. The method of claim 10, An automatic image reading unit determining whether a touch operation is drawn from points provided for different times through a specific channel as the extracted one point is provided through different channels; And a tracking filtering unit for tracking the drawn images and smoothing the traced images when the automatic image reading unit determines the drawing. The touch screen device of claim 10, wherein the image sensor is a line scan camera, and the image noise removing unit removes a noise component included in each frame. The image sensor of claim 10, wherein the image sensor is a camera, and the image noise removing unit removes an image except for an image corresponding to a line component from a three-dimensional image, and includes a noise component included in each frame in the image of the line component. Touch screen device, characterized in that for removing. The display apparatus of claim 9, wherein the display screen has a quadrangular shape, and first, second, third, and fourth image sensors are disposed in a corner area of the display screen. The display screen includes first, second, third, and fourth side planar regions divided by diagonal lines connecting the first to fourth image sensors. And wherein each of the side planar regions is covered by two opposing image sensors. The display apparatus of claim 15, wherein the first and second image sensors covering the side plane including the touch point and the line connecting the first image sensor and the touch point meet one side of the display screen. When the line connecting the second image sensor and the touch point defines a second point that meets the other side facing the one side, Each of the x and y coordinates of the touch point

Where L1 is the length between the first image sensor and the second image sensor, m is the length between the first point and the second image sensor, and n is the length between the second point and the first image sensor. Touch screen device, characterized in that.

Images