KR101814477B1 - A Laser Touch Sensor for sensing the Position of an Object - Google Patents

A Laser Touch Sensor for sensing the Position of an Object Download PDF

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Publication number
KR101814477B1
KR101814477B1 KR1020150074748A KR20150074748A KR101814477B1 KR 101814477 B1 KR101814477 B1 KR 101814477B1 KR 1020150074748 A KR1020150074748 A KR 1020150074748A KR 20150074748 A KR20150074748 A KR 20150074748A KR 101814477 B1 KR101814477 B1 KR 101814477B1
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South Korea
Prior art keywords
screen
module
light
optical
display device
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KR1020150074748A
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Korean (ko)
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KR20160139586A (en
Inventor
안현선
안준선
심창우
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주식회사 앱스
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/0304—Detection arrangements using opto-electronic means

Abstract

A laser touch sensor using a rotation optical system according to the present invention is installed at one side of a frame of a display device constituting a screen and irradiates projection light in a direction parallel to the screen while rotating around a direction perpendicular to the screen, A control unit for recognizing the position of the pointing object on the screen using the light receiving signal, and a control unit for controlling the display unit to display the light receiving signal on the screen, And a connecting member for coupling a pair of the rotating optical unit and the control unit to the display unit, wherein the irradiation area of the projection light intersects each other on the same plane.
Therefore, in the laser touch sensor using the rotation optical system according to the present invention, the projection light projected on the front side of the screen is reflected and reflected on the surface of the indicated object approaching the screen by the optical module installed on the rim of the display device, The position of the pointing object is recognized on the screen by using the reflected light. Therefore, it is not necessary to provide a separate reflecting member on the edge of the display device in comparison with the conventional technology, so that an increase in thickness of the display device can be minimized have.

Description

[0001] The present invention relates to a laser touch sensor using a rotating optical system,

The present invention relates to a laser touch sensor using a rotating optical system, and more particularly, to a laser touch sensor using a rotating optical system, more specifically, even if a separate reflecting member is not provided at the edge of a display device, And more particularly, to a laser touch sensor 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 pointed 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.

In the case of the pointed object recognition apparatus using the optical module according to Document 1 described below, since the light irradiated from the light emitting device is configured to be reflected by the prism mirror provided in front of the display screen, the overall size of the optical module is increased However, since the prism mirror is always rotated 360 degrees by the driving motor even though the light irradiation is required only in the range of 180 degrees, there is a problem that the driving power of the driving motor is wasted and reliability is lowered.

[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, The present invention provides a laser touch sensor using a rotary optical system that is 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, will be.

Another object of the present invention is to provide an optical module for recognizing an indicated object, which comprises a light emitting device for emitting projection light onto a flat plate rotated by external power, and a light receiving device for receiving the reflected light reflected by the pointed object The present invention is to provide a laser touch sensor using a rotary optical system that can reduce the overall size of the optical module.

It is still another object of the present invention to provide a method and an apparatus for rotating a turntable by rotating the turntable in a reciprocating manner only in a necessary range, thereby preventing unnecessary power consumption and reliability degradation of an external driving source for rotating the turntable, And to provide a laser touch sensor using the optical system.

According to an aspect of the present invention, there is provided a laser touch sensor using a rotary optical system, the laser touch sensor comprising: A pair of rotating optical parts for receiving projection light from the pointed object approaching the screen and for receiving reflected light in which the projection light is regressively reflected and outputting a light receiving signal, And a connecting member for connecting the pair of rotating optical units and the control unit to each other and coupling the rotating optical unit and the control unit to each other, wherein the irradiation areas of the projection light intersect each other on the same plane.

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.

The rotation optical unit may include a plate-shaped base, a light emitting module mounted on one side of the base for emitting projection light, a light receiving module installed on the other side of the base for receiving the reflected light and outputting a light receiving signal, And a half mirror which is provided on the same or parallel path as the light receiving module and reflects the reflected light reflected and reflected from the indicated object toward the light receiving module, and a driving module for rotating the base.

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 at which the base reaches the reference position, and the control unit may calculate the rotation angle using the reference time and the output time of the light- .

The rotating optical unit may further include a housing for housing the base, the light emitting module, the light receiving module, and the half mirror, and a rotating shaft for rotatably supporting the base on one side of the housing.

Further, an optical window for transmitting the projection light and the reflected light is formed on at least one side of the housing.

The drive module may be a motor or a solenoid.

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 .

In addition, the connecting member is configured to have a rod shape connecting each of the rotation optical parts to both sides of the control part, and the rod length can be adjusted according to the size of the display device.

As described above, the laser touch sensor using the rotation optical system according to the present invention is configured such that the projection light projected in front of the screen by the optical module installed on the rim of the display device is reflected and reflected on the surface of the pointing object approaching the screen, Since the position of the pointed object is recognized on the screen by using reflected light incident on the module, there is no need to provide a separate reflecting member on the edge of the display device in comparison with the prior art, so that the thickness increase of the display device can be minimized There is an advantage.

In addition, the laser touch sensor using the rotation optical system according to the present invention includes a light emitting device that irradiates projection light on a flat plate rotated by an external power to recognize an indicated object, It is possible to omit some components such as a prism mirror when compared with the prior art, thereby making it possible to remarkably reduce the overall size of the optical module.

Further, since the laser touch sensor using the rotation optical system according to the present invention is configured such that the rotation plate rotates reciprocally (i.e., normal rotation) only within a necessary range, unnecessary power waste and reliability degradation of the external drive source for rotating the rotation plate There is an advantage that it can be prevented.

1 and 2 are an exploded perspective view and a coupling view showing a state in which a laser touch sensor using a rotation optical system according to an embodiment of the present invention is mounted on a display device,
3 is an enlarged view of the "a" part of Fig. 1,
4 is a sectional view taken along the line AA in Fig. 3,
5 is a view illustrating a configuration of a rotating optical unit applied to a laser touch sensor using a rotating optical system according to an embodiment of the present invention,
FIG. 6 is a block diagram for explaining an operation of a laser touch sensor using a rotation optical system according to an embodiment of the present invention, and FIG.
7 and 8 are views for explaining the operation of the laser touch sensor using the rotation optical system according to the embodiment of the present invention.

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

FIGS. 1 and 2 are an exploded perspective view and a combined view, respectively, showing a state in which a laser touch sensor using a rotation optical system according to an embodiment of the present invention is mounted on a display device, and FIG. 3 is a cross- And Fig. 4 is a cross-sectional view taken along line AA of Fig.

5 is a diagram illustrating a configuration of a rotating optical unit applied to a laser touch sensor using a rotating optical system according to an embodiment of the present invention. FIG. 6 is a schematic view of a laser touch sensor using a rotating optical system according to an embodiment of the present invention. 7 and 8 are views for explaining the operation of the laser touch sensor using the rotation optical system according to the embodiment of the present invention.

The laser touch sensor using the rotating optical system according to the present invention includes a pair of rotating optical parts 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 pointed object approaching the screen.

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 reflected light of the projection light reflected from the object and output a 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 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 the second rotary optical part 30 provided at the other corner of the upper surface frame so as to face the first rotary optical part 20 and the second rotary optical part 30. However, May be installed at one side of the rim of the display device 10, as needed.

The first rotating optical unit 20 includes a housing 21, an integrated optical module 22, 23, 24, 25 accommodated in the housing and adapted to irradiate the projection light or receive reflected light, A rotary shaft 26 rotatably installed at one side of the interior of the housing 21 to support the modules 22, 23, 24 and 25 and a drive module 27 for rotating the rotary shaft 26 .

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.

At least one side of the housing 21 is formed with an optical window W so that the projected and received optical rays irradiated or received by the rotating optical modules 22, 23, 24, and 25 can be transmitted as described later The optical window W may be formed in an open slit shape, but it is more preferable that the optical window W is made of a glass or plastic material in order to prevent contaminants such as dust from entering into the inside of the housing 21 .

The optical modules 22, 23, 24 and 25 include a base 22 in the form of a plate or a panel parallel to the screen, a light emitting module 23 A light receiving module 24 fixed to the other side of the upper surface of the base 22 to receive the reflected light and output a light receiving signal, a light receiving module 24 fixed on the same or parallel path as the path of the projected light from the upper surface of the base 22, And a half mirror (25) installed to reflect the reflected light incident on the pointing object in the direction of the light receiving module (24).

At this time, the base 22 is provided with a surface (that is, an upper surface) on which the light emitting module 23, the light receiving module 24, and the half mirror 25 are provided so as to be irradiated with the projection light in front of the screen, And in this embodiment, the base 22 is formed in a disk shape as an example.

The base 22 configured as described above is connected to a rotation shaft 26 and a drive module 27 to be described later so that the projection light is radiated on a plane parallel to the screen while being rotated about a rotation axis perpendicular to the screen do.

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. The light receiving module 24 can be preferably implemented using a normal light receiving sensor (photodiode or the like) In the embodiment, the light receiving module 24 is arranged to form an angle of about 90 with the light emitting module 23.

The half mirror 25 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 rotation shaft 26 serves to support the optical modules 22, 23, 24, and 25 on one side of the housing in a direction perpendicular to the screen, 22 and the other end thereof is connected to a drive module 27 to be described later.

At least one of the coupling portion between the base 22 and the rotary shaft 26 or the coupling portion between the driving module 27 and the rotary shaft 26 may be configured such that the rotary shaft 26 is rotatable .

The driving module 27 is preferably fixed to one side of the housing 21 and may be constructed using a motor or a solenoid. The driving module 27 may be configured to rotate the rotary shaft 26 by 360 degrees. In an example, the drive module 27 is configured to rotate the rotation shaft 26 in the forward and reverse directions according to 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 laser touch sensor using the rotation optical system according to the present embodiment includes a connection member 50 connecting the rotation optical unit 20 and the control unit 100 and a rotation optical system And a mounting member 60 for mounting the laser touch sensor to the one side of the display device 10 (the upper surface of the display device in this embodiment).

The connection member 50 is formed in a bar shape connecting the first rotary optical unit 20 and the second rotary optical unit 30 to both sides of the control unit 100. The size of the display device, It is preferable that the length thereof is adjustable according to the length of the guide rail.

The connecting member 50 includes a first hollow rod 51 having a passage formed therein and a second rod 51 for controlling the length of the connecting member 50 while being projected and retracted through the inner passage of the first rod 51 And a second rod (52) for allowing the first rod

In order to perform the above-described functions, the connecting member 50 can be preferably implemented using any one of conventional known rod length adjusting methods, but in the present embodiment, for example, the first rod 51 and the And a ball spring and a groove are formed in the connecting portion of the two rods 52 so that the length can be adjusted stepwise.

The mounting member 60 may be formed of a conventional screw, rivet, or bolt / nut, but in the present embodiment, the mounting member 60 may be an adhesive member such as a double-sided tape .

Further, the laser touch sensor using the rotation optical system according to the present embodiment further includes a position scanning unit 40 for detecting a reference time, which is a time when the base 22 reaches a predetermined reference position, and outputting it as an electric signal 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 rotary optical unit 20, It is configured to output a predetermined type of electric signal such as a pulse.

For this purpose, in the present embodiment, for example, the position scanning unit 40 is provided on one side of the bottom surface of the base, and a marking unit 41 installed on one side of the housing 21 for recognizing the marking unit, And a position detection sensor 42.

The control unit 100 controls the light emitting module 23 and the driving module 27 so that the light emitting module 23 and the driving module 27 are controlled in a radial direction in parallel with the screen. The light receiving module 24, the position scanning unit 40, and the timer unit 110 are used to illuminate the 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 rotation angle calculation unit 102 for calculating a rotation angle of the optical module 22, 23, 24, 25 with respect to the reference position using the amplified light reception signal, A 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 in consideration of 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 beginning of the operation of the control unit 100 is separately required.

7, the control unit 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 at the beginning of the operation 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 indicating object according to the algorithm stored in advance 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 surface of the base 22 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 22 is composed of 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).

Figure 112015051318019-pat00001

Figure 112015051318019-pat00002

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.

As described above, the laser touch sensor using the rotation optical system according to the present invention is configured such that the projection light projected in front of the screen by the optical module installed on the rim of the display device is reflected and reflected on the surface of the pointing object approaching the screen, Since the position of the pointed object is recognized on the screen by using reflected light incident on the module, there is no need to provide a separate reflecting member on the edge of the display device in comparison with the prior art, so that the thickness increase of the display device can be minimized There is an advantage.

In addition, the laser touch sensor using the rotation optical system according to the present invention includes a light emitting device that irradiates projection light on a flat plate rotated by an external power to recognize an indicated object, It is possible to omit some components such as a prism mirror when compared with the prior art, thereby making it possible to remarkably reduce the overall size of the optical module.

Further, since the laser touch sensor using the rotation optical system according to the present invention is configured such that the rotation plate rotates reciprocally (i.e., normal rotation) only within a necessary range, unnecessary power waste and reliability degradation of the external drive source for rotating the rotation plate There is an advantage that it can be prevented.

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

Claims (10)

And a projection optical system for projecting the projection light from an object pointed to the screen in a direction parallel to the screen while being rotated about a direction perpendicular to the screen, A pair of rotating optics for receiving the 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,
The irradiation regions of the projection light are mutually intersected on the same plane,
Wherein the rotary optical unit includes an integrated optical module, a rotary shaft coupled to the optical module in a direction perpendicular to the screen, and a driving module for rotating the rotary shaft,
The optical module includes a plate-shaped base plate parallel to the screen, a light emitting module fixed on one side of the base and irradiating projection light, a light receiving module fixedly installed on the other side of the base and receiving the reflected light, A half mirror that is fixed on a path that is the same as or parallel to the path of the projection light on the upper surface of the base and reflects the reflected light incident on the pointing object in a direction of the light receiving module, And a position scanning unit for detecting a reference time,
Wherein the control unit calculates the rotation angle of each of the rotation optical units using the reference time and the time at which the light reception signal is output and recognizes the position of the indicated object by using the calculated rotation angle Laser touch sensor using optical system. The method according to claim 1,
Further comprising a connecting member for connecting the pair of rotating optical units and the control unit to each other and coupling the unit to the display device,
Wherein the pair of rotation optical parts are provided so as to face each other at both side edges of one side edge of the display device and are rotated in a forward and reverse direction at a predetermined angle with reference to the opposite direction, . delete delete delete The method according to claim 1,
The rotating optical unit may further include a housing for receiving the optical module, the rotation axis, and the driving module therein,
And a mounting groove is formed on a bottom surface of the housing so as to be coupled to an edge of the display device. The method according to claim 6,
Wherein at least one side of the housing is provided with an optical window for transmitting the projection light and the reflected light. The method according to claim 1,
Wherein the driving module comprises a motor or a solenoid. The method according to claim 1,
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 Laser touch sensor using rotating optical system. 3. The method of claim 2,
Wherein the connecting member is configured to have a rod shape connecting each of the rotation optical parts to both sides of the control part, and the length of the rod can be adjusted according to the size of the display device.
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JP6037467B2 (en) * 2014-08-05 2016-12-07 Ｎｅｃフィールディング株式会社 Terminal, terminal control method, program, and article distribution confirmation system

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* Cited by examiner, † Cited by third party
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JP6037467B2 (en) * 2014-08-05 2016-12-07 Ｎｅｃフィールディング株式会社 Terminal, terminal control method, program, and article distribution confirmation system

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