KR20160054376A - Apparatus for sensing the Position of an Object - Google Patents

Abstract

An apparatus for recognizing the position of an indicated object by using a rotational optical system according to the present invention includes: a pair of rotational optical units each of which is installed on one side of a frame of a display device which constitutes a screen and rotates on an axis in the direction perpendicular to the screen to transmit transmission light in the direction parallel to the screen and receive reflected light which is the transmission light retroreflected from the indicated object which gets close to the screen, thereby outputting a photodetection signal; and a control unit which recognizes the position of the indicated object on the screen by using the photodetection signal, wherein radiation areas of the transmission light intersect each other on an identical plane. Because the apparatus for recognizing the position of the indicated object by using the rotational optical system according to the present invention recognizes the position of the indicated object on the screen by using the reflected light incident on an optical module which is the transmission light transmitted to the front of the screen by the optical module installed on the frame of the display device and retroreflected from a surface of the indicated object which gets close to the screen, the apparatus has an advantage of minimizing an increase of the thickness of the display device in that it is not necessary to install an additional reflecting member on the frame of the display device when the apparatus is compared with an existing technique.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

More specifically, the present invention relates to an apparatus for recognizing the position of a pointing object using a rotating optical system, and more particularly, To a pointed object position recognition apparatus using a rotating optical system capable of minimizing an increase in thickness of a display device by being configured to recognize the position of the pointing object on a display screen by using reflected light incident on the optical module, .

2. Description of the Related Art Generally, a display device is used in a product that displays a screen such as a computer monitor, a television monitor, and a mobile phone. A liquid crystal display (LCD), a plasma display panel (PDP) ), A vacuum fluorescent element (VFD), and the like.

Methods of recognizing the position of an object on the screen when an arbitrary position on the screen is pointed (or contacted) with an object on the screen include a method of recognizing the position of an object by sensing a change in resistance value, A method of detecting a position of an object, and a method of recognizing the position of an object using an optical module have been developed.

Among the above methods, the method of inputting the position of the object by detecting the change of the resistance value, the method of recognizing the position of the object by detecting the change of the capacitance is difficult to apply to the large display device. There is a problem that a malfunction occurs due to damage of the display panel.

Recently, a method of using an optical module that irradiates light in parallel with a screen of a display device and recognizes an object by using the reflected light has been developed. The content of the indicated object recognizing device using such an optical module is described in [ 1].

However, the pointed object recognizing apparatus using the optical module applied in the following [Document 1] is a method of recognizing the object according to whether or not the light irradiated from the optical module is reflected on the reflecting member provided on the rim of the display device. There is a problem in that the reflective member must be separately attached and the display device must protrude to the front side by the thickness of the reflective member.

[Reference 1] Korean Patent No. 1097992 (issued on December 26, 2011)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a display device and a method of manufacturing the display device, And the position of the indicated object is recognized on the display screen by using reflected light incident on the optical module, thereby minimizing the thickness increase of the display device. .

According to an aspect of the present invention, there is provided an apparatus for recognizing a pointed object using a rotating optical system, the apparatus comprising: A pair of rotation optics for projecting the projection light in one direction and receiving reflected light obtained by projecting and projecting the projection light from the surface of the pointing object approaching the screen and outputting a light reception signal; And a control unit for recognizing the position of the pointing object on the screen, wherein the irradiation areas of the projection light are mutually intersected on the same plane.

Each of the rotating optical units includes a driving motor that rotates about a rotation axis perpendicular to the screen, a driving motor that is coupled to the driving motor to irradiate projection light in the rotation axis direction, receive the reflected light, And a reflection mirror coupled to the driving motor and reflecting the projection light in a direction parallel to the screen while rotating and reflecting the reflection light reflected from the surface of the indicated object toward the optical module. do.

The optical module may include a light emitting module installed at the center of the rotation axis to irradiate the projection light and a light receiving module installed at the outer circumference of the light emitting module and receiving the reflected light reflected by the reflection mirror and outputting a light receiving signal, .

The pair of rotating optical parts are provided so as to face each other on both side edges of one side edge of the display device, and are rotated forward and backward at a predetermined angle with reference to the opposite direction.

Each of the rotating optical units may include a driving motor rotated in the forward and reverse directions about a rotation axis perpendicular to the screen, a plate-like base rotated by being coupled to the driving motor and parallel to the screen, and fixed on one side of the upper surface of the base A light receiving module fixedly installed on the other side of the upper surface of the base for receiving the reflected light and outputting a light receiving signal; a light receiving module fixedly installed on a path which is the same as or parallel to the path of the projected light on the upper surface of the base, And a half mirror for reflecting the reflected light, which is reflected and reflected from the indicated object, in the direction of the light receiving module.

Further, the base is a rotor of a driving motor.

The control unit recognizes the position of the pointing object by using the rotation angle of each of the rotation optical units with respect to a predetermined reference position.

Further, the rotation optical unit may further include a position scan unit for sensing a reference time, which is a time when the rotation optical unit reaches the reference position, and the control unit calculates the rotation angle using the reference time and the output time of the light receiving signal .

The control unit may further include a signal filter module for separating the received light signal from external noise, a signal amplification module for amplifying the noise-removed light reception signal, and a rotation angle calculation module for calculating the rotation angle .

As described above, the pointing device for pointing objects using the rotating optical system according to the present invention is configured such that the projection light projected in front of the screen is reflected and reflected on the surface of the pointing object approaching the screen by the optical module installed at the rim of the display device Since the position of the pointing object is recognized on the screen by using the reflected light incident on the optical module, there is no need to provide a separate reflecting member on the edge of the display device in comparison with the prior art, There is an advantage to be able to do.

In the pointed object position recognizing apparatus using the rotating optical system according to the present invention, since each rotary optical unit is integrally coupled with the driving motor and rotates, a driving motor and an optical system are separated from each other. There is an advantage that the assembling process becomes very convenient when preparing.

That is, in the related art, there is a problem in that the optical module and the driving motor are integrated with each other in the same manner as in the present invention, considering the optical alignment between the optical module and the reflecting mirror and the optical alignment between the reflecting mirror and the screen. It is merely required to align the entire rotating optical part so that only the light reflected from the reflecting mirror is parallel to the screen. Therefore, there is an advantage that the assembling and installation of the parts becomes very easy.

1 is a perspective view illustrating a state in which an indicated object position recognition apparatus using a rotating optical system according to a first embodiment of the present invention is mounted on a display device,
Figs. 2 and 3 are respectively a cross-sectional view taken along line AA in Fig. 1 and a partially enlarged cross-
FIG. 4 is a block diagram for explaining an operation configuration of an indicated object position recognizing apparatus using a rotating optical system according to the first embodiment of the present invention; FIG.
5 is a view showing another modified example of the pointed object position recognition apparatus using the rotation optical system according to the first embodiment of the present invention,
6 and 7 are an exploded perspective view and a combined view showing a state in which an indicated object position recognizing device using a rotating optical system according to a second embodiment of the present invention is mounted on a display device,
8 is a sectional view taken along the line BB in Fig. 7,
9 is a view for explaining the operation of the pointed object position recognizing apparatus using the rotating optical system according to the second embodiment of the present invention,
FIGS. 10 and 11 are views showing the overall configuration and operation principle of a rotating optical system applied to the pointed object position recognizing apparatus according to the second embodiment of the present invention.

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

(Embodiment 1)

FIG. 1 is a perspective view showing a state in which an indicating object position recognizing apparatus using a rotating optical system according to a first embodiment of the present invention is mounted on a display device, FIGS. 2 and 3 are a cross- Fig.

4 is a block diagram for explaining an operation configuration of the pointed object position recognition apparatus using the rotating optical system according to the first embodiment of the present invention, Fig. 8 is a diagram showing another modified example of the pointed object position recognizing apparatus.

The pointed object position recognizing apparatus using the rotating optical system according to the present invention includes a pair of rotating optical units 20 and 30 provided on one side of a frame of a display device 10 constituting a screen, And a controller (100) for recognizing the position of the pointing object approaching the screen by using the pointing device (30).

The pair of rotating optical units 20 and 30 respectively project projection light in a direction parallel to the screen in front of the screen while being rotated about a direction perpendicular to the screen, And is configured to receive the reflected light of the projection light reflected from the surface of the object and output the received light signal.

Therefore, the projection light irradiated by the rotating optical units 20 and 30 is irradiated radially, so that the respective irradiation areas form a plane parallel to the screen as a whole. Specifically, the position of the indicated object is recognized The irradiation regions of the rotating optical units 20 and 30 have a characteristic of intersecting (i.e., overlapping) each other on the same plane.

In this embodiment, for example, the pair of rotating optical units 20 and 30 include a first rotating optical unit 20 provided on one side of the upper surface of the display device 10, And a second rotary optical part 30 provided on the other side of the upper surface of the first rotary optical part 20 so as to face the first rotary optical part 20. However, the present invention is not limited to this, 20, and 30 may be installed at one side of the rim of the display device 10, as needed.

The first rotation optical unit 20 includes a housing 21, a driving motor 22 that is accommodated in the housing and rotates about a rotation axis 22d perpendicular to the screen, And an optical module (23, 24) coupled to the driving motor (22) to irradiate projection light toward the rotation axis (22d) and receive the reflected light to output a light receiving signal, And a reflection mirror (25) reflecting the light reflected in the direction parallel to the screen and reflected from the surface of the indicating object in the direction of the optical module.

It is preferable that the housing 21 is made of a metal or a plastic material and a mounting groove G is formed on the lower surface of the housing 21 mounted on the upper surface of the display device 10.

An optical window W is formed on at least one side of the housing 21 so that the projected light and the reflected light radiated by the rotating optical modules 23 and 24 can be transmitted as described later. It is more preferable to use a glass or plastic material to prevent the contaminants such as dust from entering into the inside of the housing 21. [

The drive motor 22 may be preferably implemented as a conventional motor such as a small BLDC motor. In this embodiment, the drive motor 22 may be an external type motor having a hollow hole 22g formed at its center, BLDC motor.

The driving motor 22 includes a base panel 22a including a control circuit and the like for operating a motor and a driving shaft 22d for rotating the hollow shaft 22d about the hollow shaft 22d on the upper surface of the base panel 22a. A bearing 22c on which the rotary shaft 22d is inserted, a stator 22b provided along the outer peripheral surface of the bearing 22c and wound with a coil, a stator 22b, And a permanent magnet 22f provided on the inner peripheral surface of the rotor 22e so as to maintain the permanent magnet 22f.

At this time, the rotor 22e is formed in a cap shape whose upper surface is flat, and the permanent magnets 22f are alternately arranged with N poles and S poles.

In the present embodiment, the drive motor 22 is constructed as described above. However, the present invention is not limited thereto, and the drive motor 22 may be configured differently within the range of performing the same function Of course.

The optical modules 23 and 24 include a light emitting module 23 installed at the center of the rotation axis 22d and emitting projection light and a light emitting module 23 installed at the outer periphery of the light emitting module 23, And a light receiving module 24 that receives the reflected light reflected by the light receiving module 24 and outputs a light receiving signal.

In the present embodiment, the optical modules 23 and 24 are integrally formed, thereby omitting the half mirror used in the prior art. For example, when the optical modules 23 and 24 are hollow, (Not shown) formed in the upper portion of the hole 22g.

The light emitting module 23 is preferably configured to irradiate an infrared ray of a specific frequency band. In this embodiment, the light emitting module 23 is configured using an ordinary infrared laser light source as an example.

The light receiving module 24 generates a light receiving signal, which is an electric signal proportional to the intensity of the incident reflected light, and can be preferably implemented using a normal light receiving sensor (such as a photodiode) formed of a diode or the like.

The reflecting mirror 25 is installed on one side of the upper surface of the rotor 22e so as to be positioned above the optical modules 23 and 24. The reflecting mirror 25 reflects the light emitted from the light emitting module 23 in the direction of the rotating shaft 22d It is preferable that the light guide plate is installed at an angle that can reflect light in a direction parallel to the display surface.

Further, if necessary, a condensing lens (or collimating lens) 26 may be further provided on the optical path of the light reflected by the reflecting mirror 25.

The projection light emitted from the light emitting module 23 is reflected by the reflection mirror and then refracted in the direction of the condensing lens. The refracted light passes through the condensing lens and is irradiated in a direction parallel to the display surface.

On the other hand, the reflected light reflected by the pointing object located on the display surface is reflected by the reflecting mirror after passing through the condensing lens while maintaining a certain angle with the display surface, unlike the above-mentioned irradiation light.

Since the reflected light is reflected by the reflecting mirror 25 in the direction of the rotation axis 22d while maintaining a certain angle with the rotation axis 22d, 24) is provided, the reflected light can be sensed.

In this case, the first and second rotary optical units 20 and 30 according to the present embodiment are configured to rotate 360 degrees as an example. If necessary, the first and second rotary optical units 20 and 30 may be rotated .

Since the half mirror can be omitted in comparison with the conventional art, the rotating optical system according to the present embodiment is advantageous in that the amount of available light increases theoretically from 25% to 100%. Thus, So that they can be sensed.

Further, since the light irradiating unit and the light receiving unit are provided on the hollow shaft portion of the rotary motor, there is an advantage that the size of the indicating object position recognizing device can be miniaturized as a whole.

In addition, unlike the prior art, since the amount of available light is maximized as described above, irregularly reflected light from the surface of the indicated object can be effectively sensed even if there is no reflector on the rim of the display, and by the light amount of 75% generated by the half mirror There is an advantage that the accuracy of the signal sensing can be remarkably improved by removing the noise.

The pointed object position recognition apparatus using the rotating optical system according to the present embodiment further includes a position scanning unit 40 for sensing a reference time, which is a time when the driving motor 22 reaches a predetermined reference position, The position scanning unit 40 may be implemented using a conventional Hall sensor or a motion sensor. The position scanning unit 40 may be a marking device such as a metal or a magnetic sensor installed at a specific position of the driving motor 22, It is configured to output a predetermined type of electric signal such as a pulse.

To this end, in the present embodiment, for example, the position scanning unit 40 is provided at one side of the side surface of the drive motor 22, and a marking device 41 installed at one side of the housing 21 to recognize the marking device And a position sensor 42 for outputting an electric signal.

Meanwhile, since the second rotating optical section 30 has the same configuration as the first rotating optical section 20 described above, a duplicate description will be omitted.

The control unit 100 controls the light emitting module 23 and the driving motor 22 in a direction parallel to the screen so that the light emitting module 23 and the driving motor 22 are controlled in the same direction. The light receiving module 24, the position scanning unit 40, and the timer unit 110 are used to illuminate the radial projection light, thereby recognizing the position of the pointing object approaching the screen.

The controller 100 includes a signal filter module 101 for separating the light receiving signal output from the light receiving module 24 from the external noise when receiving the reflected light incident through the optical window W, A signal amplification module 102 for amplifying a light receiving signal from which noise has been removed, a signal amplifying module 102 for calculating a rotation angle of the driving motor 22 or optical modules 23 and 24 with respect to the reference position using the amplified light receiving signal A rotation angle calculation module 103, and a control module 104 for controlling the operation of each of the above-described device parts and modules.

At this time, the control unit 100 uses the signal filter module 101 and the signal amplification module 102 to generate the light reception signal output from the light reception module 24 according to a predetermined frequency band Only the received light signal is selected and amplified to recognize the position of the indicated object.

Specifically, in the case of the signal filter module 101, the signal filter module 101 selectively transmits only a light reception signal generated by the light of the same frequency band as the frequency band of the projection light to the signal amplification module 102, The signal amplification module 102 amplifies the transmitted electrical signal. Since the frequency filtering technique and the signal amplification technique of the electrical signal are general techniques, a detailed description thereof will be omitted here.

In the present embodiment, a method of removing a noise by applying a frequency filter to a light receiving signal has been described as an example. However, the present invention is not limited to this case. If necessary, an optical filter (not shown) The light receiving module 24 receives only light corresponding to the frequency band of the projection light and outputs an electric signal.

In addition, the controller 100 may previously measure and store the background noise of the installation area output from the light receiving module 24 for a predetermined period of time during the initial installation, as in the case of a conventional measurement device, And may be configured to reflect this in processing.

The present invention is also applicable to a case where reflected light is received while projecting radial projected light in a direction parallel to the screen, paying attention to the point that a surface of an indicated object such as a finger or a pointer is reflected by infrared rays, And the position of the pointing object is recognized on the screen. The method of calculating the position of the pointing object by using the rotation angle of the rotating optical units 20 and 30 is a known technique disclosed in [Document 1] It will be readily apparent to those skilled in the art that a detailed description thereof will be omitted here.

However, in the case of the related art, since the reflective member is provided on the edge of the display device and the light reflected from the reflective member is used, a process of separately recognizing the entire size (i.e., size) However, since the reflective member is not used in the present embodiment, a process of recognizing the overall size on the screen at the initial stage of the operation of the control unit 100 is separately required. This will be described in detail in the second embodiment described later .

In the present embodiment, the drive motor 22 is a hollow motor. However, the present invention is not limited thereto. If necessary, the drive motor 22 may be a general external type The optical module 23, 24, the reflecting mirror 25, and the condenser lens 26 may be provided on a plane formed by the motor and coupled to the top surface or the rotor of the rotor.

As described above, the pointing device for pointing objects using the rotating optical system according to the present invention is configured such that the projection light projected in front of the screen is reflected and reflected on the surface of the pointing object approaching the screen by the optical module installed at the rim of the display device Since the position of the pointing object is recognized on the screen by using the reflected light incident on the optical module, there is no need to provide a separate reflecting member on the edge of the display device in comparison with the prior art, There is an advantage to be able to do.

In the pointed object position recognition apparatus using the rotating optical system according to the present invention, since the rotating optical units 20 and 30 are combined with the driving motor 22 to rotate, the driving motor and the optical system are separated [Patent document 1] and the like, it is advantageous that the assembling process becomes very convenient.

That is, in the related art, there is a problem in that the optical module and the driving motor are integrated with each other in the same manner as in the present invention, considering the optical alignment between the optical module and the reflecting mirror and the optical alignment between the reflecting mirror and the screen. It is only necessary to align the entire rotating optical part so that only the light reflected from the reflecting mirror is parallel to the screen. Therefore, it is very easy to assemble and install the parts, which is also the case with the second embodiment described later.

(Second Embodiment)

6 and 7 are an exploded perspective view and an exploded perspective view showing a state in which the indicated object position recognition device using the rotating optical system according to the second embodiment of the present invention is mounted on the display device, FIG.

9 and 10 are views for explaining the operation of the pointed object position recognition apparatus using the rotating optical system according to the second embodiment of the present invention. Fig. 5 is a diagram showing an overall configuration and operation principle of a rotating optical system applied to a recognition apparatus.

Since the pointed object position recognizing apparatus using the rotating optical system according to the present embodiment is different from the first embodiment only in the configuration of the optical system, the same constituent elements are given the same reference numerals and the duplicated description is omitted do.

In the present embodiment, for example, the pair of rotating optical units 20 and 30 include a first rotating optical unit 20 and a second rotating optical unit 20 installed on one edge of the upper surface of the display device 10, And a second rotation optical part 30 provided at the other corner of the upper surface of the frame so as to face the second rotation optical part 30.

The first rotating optical unit 20 includes a housing 21, a driving motor 22 accommodated in the housing and rotated in the normal or reverse direction to the screen, (B, 23, 24, 27) which emits light or receives reflected light.

The optical module (B, 23, 24, 27) is fixed to one side of the upper surface of the base (B) by being coupled to the drive motor (22) A light receiving module 24 fixed to the other side of the upper surface of the base B for receiving the reflected light and outputting a light receiving signal, And a half mirror 27 fixedly installed on a path that is the same as or parallel to the path of the light and reflects the reflected light incident on the pointing object by being reflected and reflected by the pointing object toward the light receiving module 24.

At this time, the surface of the base B on which the light emitting module 23, the light receiving module 24, and the half mirror 27 are provided (that is, the upper surface) is spaced from the screen by a predetermined distance And in this embodiment, the base (B) is formed as a disk.

The base B configured as described above is connected to the rotor 22e of the drive motor 22 to be described later and is rotated about a rotation axis 22d perpendicular to the screen so that the projection light is radially To be investigated.

In this embodiment, the optical module is installed on a separately provided base. However, if necessary, the base may be a rotator of the drive motor as in the first embodiment.

The half mirror 27 reflects a part of the reflected light, which is reflected by the surface of the pointing object approaching the screen, which is irradiated by the light emitting module 23, through the optical window W, (24) direction, and can be preferably implemented using a conventional half mirror for an optical system.

The driving motor 22 is fixed to one side of the housing 21 and may be configured to rotate 360 degrees as in the first embodiment described above. In the present embodiment, the driving motor 22, for example, And is configured to rotate forward and backward along a predetermined angle as will be described later.

Since the second rotating optical section 30 has the same configuration as the first rotating optical section 20 described above, a duplicate description will be omitted.

The pointed object position recognition apparatus using the rotating optical system according to the present embodiment includes a connecting member 50 connecting the rotating optical unit 20 and the control unit 100, And a mounting member 60 for mounting the indicated object position recognition device using the optical system on one side of the frame of the display device 10 (the upper surface of the display device in this embodiment).

In this case, the mounting member 60 can be preferably implemented using conventional screws, rivets, and bolts / nuts, but in the present embodiment, the mounting member 60 is made of an adhesive member such as a double-sided tape .

It goes without saying that the configuration relating to the connecting member 50 and the mounting member 60 may be applied to the first embodiment described above.

In the meantime, as described in the first embodiment, the pointer position recognizing apparatus according to the present invention does not use a reflective member in the frame portion as in the prior art, A process of recognizing the entire size is separately required.

Therefore, in the present embodiment, as shown in Fig. 8, when the control section 100 recognizes the upper left point X1, the upper right point X2, the lower right point X3, and the lower left point X4 of the screen The initialization process may be required. After the installation is completed in the display device, the user sequentially instructs the coordinates (X1, X2, X3, X4) to the pointing object according to the algorithm previously stored in the control unit 100, (100) calculates and stores a rotation angle of the rotating optical unit (20,30) corresponding to each of the coordinates.

On the other hand, when the reflected light reflected on the surface of the pointed object is received, the control unit 100 controls the positional scanning unit 40 and the rotation angle calculation module 103, In this embodiment, for example, the reference position is set at a position for projecting the projection light in the direction in which the respective rotary optical parts 20 and 30 face each other (that is, Is parallel to the upper surface of the display device).

The rotary optical units 20 and 30 are configured to irradiate the projection light while being rotated at a predetermined cycle T or rotated in the forward and reverse directions. In the present embodiment, the rotary optical units 20 and 30 include, (For example, 90 DEG) at a predetermined angle based on the rotation angle of the rotor.

When the marking device 41 installed on the bottom of the base B reaches the reference position, the position detecting unit 42 detects the position of the marking unit 41, a is detected (that is, t ₀₎ when the reference time to reach the reference position.

According to the above-described structure, the controller 100 can calculate the rotation angle of the position at which the rotation optical unit 20 or 30 receives the reflected light, which will be described in detail below.

For example, when the position sensor part 42 is constituted by a hall sensor and the marking device 41 provided on the bottom surface of the base B is constituted by magnets, the rotation angle calculation module 103 calculates the rotation angle? 30, which outputs the light receiving signal by using the rotation period T of the rotating optical unit and the time at which the reflected light is received (i.e., the time at which the light receiving signal is output) Which is an angle with respect to the reference position of the reference position.

That is, first the position scan unit 40, as shown in Figure 8 the time t ₀ And rotating at t ₀ + T optical portion (specifically, a base) is above was recognized that reaches the reference position, the light receiving module 24 is a reception time (that is, the light-receiving signal is output to the light reflected from the indicating object Time) t , The rotation angle [theta] ₁ of the corresponding rotation optical part 20, 30 at the time t can be obtained by the following equation (1).

In this case, the rotation period T is a predetermined value as a characteristic value of the driving module 27 or a value that can be obtained using the output of the position scanning unit 40 by the control unit 100 as described above.

The time at which the reflected light is received (i.e., the time t) can be obtained by using a signal processing technique such as a light receiving signal output from the light receiving module 34 and a measurement result of the timer unit 110 corresponding thereto .

When the rotational angles of the pair of rotating optical units 20 and 30 are calculated as described above, the controller 100 calculates the coordinates of the pointing object that reflects the reflected light on the screen in the same manner as described in [Document 1] Position) can be calculated.

The pointed object position recognizing device using the rotating optical system according to the present embodiment includes a light emitting device for irradiating the optical module on the flat plate rotated by external power for recognizing the pointed object, And a light receiving device for receiving the reflected light reflected by the reflection mirror is fixedly installed. Thus, there is an advantage that the configuration of the reflection mirror can be omitted when compared with the first embodiment.

Further, the pointed object position recognizing apparatus using the rotating optical system according to the present embodiment is configured such that the rotating plate is reciprocally rotated (that is, normal and reverse rotations) only within a necessary range, thereby unnecessary power waste and reliability of the external driving source for rotating the rotating plate There is an advantage that the deterioration can be remarkably prevented.

10: display device 20,30: rotating optical part
40: position scanning unit 50: connection member
60: mounting member 100:

Claims (9)

And a projection optical system for projecting the projection light in a direction parallel to the screen while being rotated about an axis perpendicular to the screen, A pair of rotating optical parts for receiving the regressively reflected light and outputting a light receiving signal;
And a controller for recognizing the position of the pointing object on the screen using the light receiving signal,
Wherein the irradiation area of the projection light intersects each other on the same plane. The method according to claim 1,
Each of the rotation optical units includes a driving motor that rotates about a rotation axis perpendicular to the screen, an optical module that is coupled to the driving motor and rotates while irradiating the projection light in the rotation axis direction, And a reflection mirror coupled to the driving motor and reflecting the projection light in a direction parallel to the screen while rotating and reflecting the reflection light reflected from the surface of the pointing object in the direction of the optical module Positioning device for pointing object using optical system. 3. The method of claim 2,
The optical module includes a light emitting module installed at the center of a rotation axis to irradiate projection light and a light receiving module installed at an outer circumference of the light emitting module and receiving reflected light reflected by the reflection mirror and outputting a light receiving signal Wherein the position information of the pointing object is obtained by using the rotation optical system. The method according to claim 1,
Wherein the pair of rotating optical parts are provided so as to face each other on both side edges of one side edge of the display device and are rotated forward and backward at a predetermined angle with reference to the opposite direction, Position recognition device. 5. The method of claim 4,
Each of the rotation optical units includes a driving motor that rotates in the normal or reverse direction about a rotation axis perpendicular to the screen, a plate-like base that is coupled to the driving motor and rotates and is parallel to the screen, A light receiving module fixedly installed on the other side of the upper surface of the base and receiving the reflected light and outputting a light receiving signal; a light receiving module fixedly installed on a path which is the same as or parallel to the path of the projection light on the upper surface of the base, And a half mirror for reflecting the reflected light, which is reflected and reflected from the light receiving module, toward the light receiving module. 6. The method of claim 5,
Wherein the base is a rotor of a driving motor. 7. The method according to any one of claims 1 to 6,
Wherein the control unit recognizes the position of the pointing object by using the rotation angle of each of the rotation optical units with respect to a predetermined reference position. 8. The method of claim 7,
Wherein the rotating optical unit further comprises a position scanning unit for sensing a reference time, which is a time at which the rotating optical unit reaches the reference position,
Wherein the control unit calculates the rotation angle using the reference time and the time at which the light reception signal is output. 7. The method according to any one of claims 1 to 6,
The control unit includes a signal filter module for separating the light receiving signal from external noise, a signal amplifying module for amplifying the noise-removed light receiving signal, and a rotation angle calculating module for calculating the rotation angle A position detection device for detecting the position of the pointed object using the rotary optical system.

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