KR101756948B1 - Apparatus of electronic bulletin board - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic whiteboard apparatus, and more particularly, to an electronic whiteboard apparatus capable of preventing the occurrence of glare and shadow caused by a beam projector and improving the convenience of a presenter or an educator using the electronic whiteboard.
To this end, the present invention provides a screen panel comprising a transparent material layer and a PDLC film layer bonded to one surface of the transparent material layer; And a projector section for irradiating the PDLC film layer with image information to display an image on the PDLC film layer, wherein the screen panel is disposed between a viewer and a projector section for viewing the image, Wherein the image information is irradiated in a direction opposite to the front face, which is the face on which the image is viewed, so that interference does not occur in the image information irradiated by the projector unit even when there is an object between the viewer and the screen panel, And irradiating image information onto the PDLC film layer.

Description

{APPARATUS OF ELECTRONIC BULLETIN BOARD}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic whiteboard apparatus, and more particularly, to an electronic whiteboard apparatus capable of preventing the occurrence of glare and shadow caused by a beam projector and improving the convenience of a presenter or an educator using the electronic whiteboard.

Generally, an electronic board is a combination of a beam projector or a LCD monitor and a sensor, which not only produces the same effect as writing on a whiteboard or a blackboard, but also displays the screen of the PC as it is, It is a multifunctional blackboard that enables videoconferencing with people in the area.

Such electronic board is mainly composed of an LCD method using a touch panel or a position sensor. Here, although the LCD method can realize a clear picture quality and a stable screen, there is a problem that the screen size is limited to the panel size. Accordingly, in recent years, an electronic blackboard of a beam projector type using a position sensor built-in electronic pen has been commercialized and sold.

Such a beam projector-type electronic whiteboard provides a great advantage that a large-sized screen can be realized because there is no restriction on the screen size as compared to an electronic blackboard in which the size of a screen is limited. However, there are various drawbacks when compared with an electronic blackboard of an LCD type. First, there is a problem that the quality of a screen of a beam projector type is lower than that of an LCD type of electronic whiteboard. In addition, as the beam projector-type copyboard projects images from the front of the copyboard to the copyboard, the shadow of the presenter or the educator positioned between the copyboard and the beam projector is projected on the copyboard to interfere with the view of the audience And there is a problem of lowering the concentration. In addition, the beam projector-type electronic whiteboards face the audience or educator's eyes most of the time during presentation or training, in which case they may also face a beam projector, which may cause glare, There is a problem that the education progress becomes difficult. In addition, in the case of the beam projection type electronic copyboard, when the mode conversion operation for converting from the writing mode to the erasing mode or the erasing mode to the writing mode in the writing program installed in the PC, the mode switching switch or the touch icon And the mode or mode is switched by touching the mode switch or the touch icon while the educator or the presenter is moving. However, such a mode switching operation inconveniences a speaker or an educator from touching the mode changeover switch or touching a touch icon by moving the both ends of the electronic board, resulting in a lecture or announcement breaking .

Korean Patent Publication No. 10-2015-0094084 (Aug.

SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems of the conventional art as described above, and it is an object of the present invention to provide an apparatus and a method for preventing glare and shadow generation caused by a beam projector and improving the convenience of a presenter or an educator using the electronic blackboard The present invention provides an electronic board device capable of making an electronic board.

To this end, the present invention provides a screen panel comprising a transparent material layer and a PDLC film layer bonded to one surface of the transparent material layer; A projector unit irradiating image information on the PDLC film layer to display an image on the PDLC film layer; A communication terminal in which a writing program is installed; And a mode changeover switch for executing a write mode of the writer program when the turner is in a turn-on state and an erase mode of the writer program when the turner is in a turn-off state; And an infrared ray intensity detection type position detector for detecting position information of an object on a two-dimensional plane of the screen panel, wherein the infrared ray intensity detection type position detector is installed on the left side of the screen panel, A right array light emitting unit provided on the right side of the screen panel for generating infrared rays in a left direction, a lower array light emitting unit provided on a lower end of the screen panel for generating infrared rays in an upward direction, A first camera unit disposed at an upper portion of the light emitting unit and configured to capture infrared rays generated by the right array light emitting unit and the lower array light emitting unit, and a second camera unit disposed at an upper portion of the right array light emitting unit, And a second camera section for photographing the generated infrared rays, The position information of the object is calculated as two-dimensional position information by using the angular value of the point at which the infrared ray captured by the first camera unit and the second camera unit is strong and the length value and the width value of the screen panel , Generates the locus information of the calculated two-dimensional position information, reverses the locus information for the position information according to the writing mode and the erase mode of the writer program installed therein, converts the locus information into image information, and outputs the image information to the projector unit Wherein the screen panel is disposed between a viewer viewing the image and the projector unit, the projector unit irradiating left and right reversed image information on the first surface of the screen panel, and the PDLC film layer And a light reflectance reducing layer formed of any one of an AG coating, an LR coating and an AR coating for reducing the light amount of the reflected light And an electronic whiteboard device.

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The screen panel may further include a second transparent material layer coupled to the surface of the PDLC film layer and opposed to the transparent material layer.

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The electronic writing board apparatus may further include a mode changeover switch for executing a writing mode of the writing program in the turn-on state and a clearing mode of the writing program in the turning off state .

In addition, the apparatus has a structure in which polymer liquid crystals are dispersed between two sheets of ITO films. When the power is not supplied to both electrodes, the opaque state is obtained. When the power is applied, the polymer liquid crystal molecules And a screen control unit for switching the state of the PDLC to a transparent state or an opaque state by applying or not applying power to the PDLC film layer which is arranged in a direction in which electric current flows and passes light so as to be in a transparent state.

The electronic whiteboard apparatus may further include a roll screen installed between the screen panel and the projector unit so as to prevent the indirect lighting from being directly irradiated to the screen panel, have.

On the other hand, the projector unit may be buried in the vicinity of the floor or the ceiling where the screen panel is disposed. In this case, a buried space is further formed in the floor or ceiling, and the electronic whiteboard apparatus is installed in the buried space , And a folding shelf for providing a space in which the projector unit can be seated.

According to the present invention, it is possible to prevent the occurrence of glare and shadow caused by the beam projector, and it is easy to switch to the writing mode and the erasing mode in the lecture or presentation, thereby improving the convenience of the presenter or educator using the electronic board And it is possible to prevent the lecture or presentation from being cut off, thereby improving the lecture or presentation effect.

1 is a configuration diagram of an electronic whiteboard apparatus according to an embodiment of the present invention.
2 is a block diagram of the electronic whiteboard apparatus shown in Fig.
3 is an enlarged cross-sectional view of the screen panel shown in Fig.
4 is a cross-sectional view of a modified example of the screen panel shown in Fig.
FIG. 5 is a front view of the infrared intensity-sensitive position detecting unit mounted on the periphery of the screen panel shown in FIG. 1 in a front view.
Fig. 6 is a front view of the state in which the infrared-intensity-sensitive position detecting unit shown in Fig. 5 is replaced with a matrix-like position detecting unit. Fig.
Fig. 7 is a configuration diagram relating to the electronic pen of the electronic whiteboard apparatus shown in Fig. 1. Fig.
8 is a block diagram of the electrical configurations of the electronic pen shown in Fig.
9 is a driving diagram showing a state in which the folding shelf shown in Fig. 1 is folded into a buried space.
10 is a driving diagram showing a state in which the folding shelf shown in Fig. 9 is folded into a buried space of a ceiling.
11 is a configuration diagram of a conventional electronic ballpoint pen apparatus for comparison with the electronic ballpoint apparatus according to an embodiment of the present invention.

The terms used in this specification will be briefly described and the present invention will be described in detail.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. Also, in certain cases, there may be a term selected arbitrarily by the applicant, in which case the meaning thereof will be described in detail in the description of the corresponding invention. Therefore, the term used in the present invention should be defined based on the meaning of the term, not on the name of a simple term, but on the entire contents of the present invention.

When an element is referred to as "including" an element throughout the specification, it is to be understood that the element may include other elements, rather than controlling other elements, unless otherwise specifically stated. Furthermore, the term "part" or the like described in the specification means a unit for processing at least one function or operation, which may be implemented by hardware or software, or a combination of hardware and software.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

1 and 2, the copyboard apparatus according to the embodiment of the present invention includes a screen panel 10 and a projector unit 20. As shown in Fig.

The screen panel 10 includes a transparent material layer 11 and a PDLC film layer 12. The transparent material layer 11 is a portion to be contacted at the time of writing. In addition, the transparent material layer 11 can be used for a purpose of making the display article visible, but also serving as a partition to prevent direct contact. The transparent material layer 11 may be made of transparent resin such as glass or acrylic. However, the transparent material layer 11 is not limited to the above example in the present invention.

The PDLC film layer 12 is a layer using PDLC (Polymer Dispersed Liquid Crystal), and the PDLC has a structure in which a polymer liquid crystal is dispersed between two ITO films (Indium Tin Oxide Film) The polymer liquid crystal molecules are arranged in the direction in which the current flows and the liquid crystal molecules become transparent by passing light therethrough. In the case of this embodiment, the PDLC film layer 12 is formed in a color close to white when opaque.

In addition, the screen panel 10 may further comprise an adhesive film 13.

The adhesive film 13 is a layer for bonding the transparent material layer 11 and the PDLC film layer 12 and is bonded to the transparent material layer 11 in a state in which a silicone adhesive is applied to one surface of the PET film, An acrylic adhesive is applied and bonded to the PDLC film layer 12. The adhesive film 13 serves to bond the PDLC film layer 12 to the transparent material layer 11.

The transparent material layer 11 and the PDLC film layer 12 are bonded to each other through the adhesive film 13 in the embodiment of the present invention. May be implemented in various ways without being limited thereto.

Further, the screen panel 10 may further include a light reflectance reducing layer 14 as shown in FIG.

The light reflectance reducing layer 14 is bonded to the PDLC film layer 12 and coated on the PDLC film layer 12 by using any one of AG (Anti Glare) coating, LR (Low Reflection) coating and AR (anti- . The light reflectance reducing layer 14 reduces the amount of light reflected by the reflectance of the transparent material layer 11 after the light of the image information irradiated by the projector unit 20 is projected onto the PDLC film layer 12, So that the image information projected on the PDLC film layer 12 can be seen more clearly.

When the PDLC film layer 12 is in an opaque state, the screen panel 10 has a white color. For example, when the PDLC film layer 12 is handwritten with a black board marker pen, the screen panel 10 plays a role of a white board. In addition, the screen panel 10 serves as a screen on which an image generated in the projector unit 20 is visualized.

On the other hand, the screen panel 10 may include a PDLC film layer 12, a transparent material layer 11, and a second transparent material layer 15, as shown in Fig.

The second transparent material layer 15 is formed of the same material as the transparent material layer 11 and the PDLC film layer 12 is bonded between the transparent material layer 11 and the second transparent material layer 15 . ≪ / RTI >

The projector unit 20 irradiates the PDLC film layer 12 with image information so that an image is displayed on the PDLC film layer 12. [ Here, it is preferable that the projector unit 20 is formed as an extreme focal type capable of displaying an image even at a short distance.

The projector unit 20 includes an image conversion unit (not shown) for displaying image information received from a communication terminal, a light source unit for projecting an image projected on the image conversion unit by irradiating a light source to the image conversion unit A lens unit (not shown) for enlarging the image projected from the light source unit, and a central operation unit (not shown) for supplying power to the image conversion unit, the light source unit and the lens unit and controlling detailed setting. However, in the present embodiment, the configuration of the projector unit 20 is not limited to the above-described configuration, and the projector unit 20 may be further added or replaced with the configuration described above.

Hereinafter, the operation of the electronic whiteboard apparatus including the above-described components will be described.

Referring to FIG. 11, which is a comparative example, the copyboard apparatus according to the comparative example is a general copyboard apparatus using a beam projector, and a beam projector F1 is disposed between the screen and the audience S1. In this case, as described in the background art, the shadow of the presenter or the educator S2 positioned between the screen and the beam projector F1 is reflected on the screen by the light of the beam projector F1, Thereby causing a problem of lowering the concentration. Further, during the presentation or training time, the eye of the presenter (S2) faces most of the audience (S1). In this case, the light irradiated from the beam projector (F1) (S2) is irradiated to cause glare, which causes difficulty in smooth presentation or education progression.

On the other hand, the electronic whiteboard apparatus according to the present embodiment is configured by disposing the screen panel 10 between the viewer S1 and the projector unit 20 for viewing an image. In this case, the projector unit 20 irradiates the image information in the opposite direction to the front face, that is, the face on which the viewer S1 views the image, so that the image information is reversed left and right and irradiated to the PDLC film layer 12. Here, the reason why the video information is inverted from left to right is that when a media file produced without reversing left and right is reproduced through the projector unit 20, the viewer S1 viewing through the screen panel 10 has a left- It is because it is visible. Therefore, the image output from the projector unit 20 is inverted from left to right so that the viewer S1 can see the originally produced image original without reversing the image.

In this way, even when there is an object between the viewer S1 and the screen panel 10, the copyboard apparatus according to the embodiment of the present invention does not cause interference with the image information irradiated by the projector unit 20, The degree of concentration of the educator or the presenter S2 is not lowered because the shadow of the presenter or the educator S2 is reflected on the screen panel 10 and the visual field of the viewer S1 is not disturbed. (S2) does not occur due to the fact that the light emitted by the speaker (S2) is not examined by the speaker or the educator (S2), so that there is no difficulty in presentation or education.

In addition, the electronic whiteboard apparatus according to the embodiment of the present invention may further include an infrared ray intensity detection type position detection unit 30 and a communication terminal 40. [

The infrared ray intensity detection type position detection unit 30 senses the position of an object on the two-dimensional plane of the screen panel 10 and transmits the locus information about the position of the object to the communication terminal.

5, the infrared ray intensity detection type position detection unit 30 includes a left side array light emitting unit 31, a right side array light emitting unit 32, a lower side array light emitting unit 33, a first camera unit 34, And a second camera unit (35).

The left-side array light emitting portion 31 is configured in such a manner that a plurality of light emitting elements are arranged and mounted on a frame. The left-side array light emitting unit 31 is installed on the left side of the screen panel and generates infrared rays in the right direction.

The right array light emitting portion 32 is configured in such a manner that a plurality of light emitting elements are arranged and mounted on a frame. The right-side array light-emitting portion 32 is provided on the right side of the screen panel and generates infrared rays in the left direction.

The lower array light emitting portion 33 is configured such that a plurality of light emitting elements are arranged on a frame. The lower array light emitting portion 33 is installed at the lower end of the screen panel and generates infrared rays in an upward direction.

The first camera unit 34 is installed on the upper part of the left array light emitting unit 31 and acquires and acquires an image in a diagonal direction looking at the right array light emitting unit 32 and the lower array light emitting unit 33.

The second camera unit 35 is installed on the upper side of the right array light emitting unit 32 and acquires and acquires images in a diagonal direction looking at the left array emitting unit 31 and the lower array emitting unit 33.

Such an infrared ray intensity detection type position detection unit 30 has a structure in which an object such as an electronic pen or a finger is placed on a screen panel and a left side array light emitting unit 31, a right side array light emitting unit 32, When the infrared rays generated by the array light emitting unit 33 are irradiated, the infrared ray is irradiated to the point where the first camera unit 34 and the second camera unit 35 are disconnected or weakened by the infrared ray intensity, The first camera unit 34 and the second camera unit 35 respectively acquire the image information of the object. In this case, the communication terminal 40 determines the angular value from the predetermined reference angle to the object in the image photographed by the first camera section 34 and the angular value from the predetermined reference angle in the image photographed by the second camera section 35 The locus information of the object moving on the plane of the screen panel 10 is generated by continuously calculating the position information of the object using the angle value to the object and the predetermined length value and the width value of the screen panel 10 .

The communication terminal 40 is a device that can communicate with a PC (PC), a set-top box, or a smart phone, and is installed with various application programs installed therein. The communication terminal 40 reproduces the media file and transmits it to the projector unit 20 so that the projector unit 20 irradiates the video image. In this case, the communication terminal 40 transmits the video And outputs the inverted signal. In addition, the communication terminal 40 is provided with a pamphlet program as an application program. The writing program supports the writing mode and the erasing mode. In the writing mode, the signer information of the sensed object is converted into the image information by the infrared ray detecting type position detecting unit 30, and the converted image information is sent to the projector unit 20 . In addition, the authoring program selectively removes the trajectory information of the object sensed by the infrared intensity-sensitive position detecting unit 30 generated in the writing mode when the erasing mode is executed, and outputs the removed image information to the projector unit 20 . The preprogramming program is superimposed on the image information transmitted from the communication terminal 40 to the projector unit 20, and is inverted in the same manner as the image information.

As described above, the electronic whiteboard apparatus according to the embodiment of the present invention calculates the sign information of an object close to the screen panel 10 when the signboard function is executed and outputs the sign information of the object through the projector unit 20, The degree of concentration of the educator or the speaker S2 is lowered because the viewer S1 does not interfere with the visual field of the viewer S1 or the speaker S2 because the shadow of the speaker S2 is reflected on the screen panel 10, Further, since the light emitted from the projector unit 20 is not illuminated by the speaker or the educator, the speaker or the educator does not experience glare, so that there is no difficulty in presentation or education.

Meanwhile, in the electronic whiteboard apparatus according to the embodiment of the present invention, the infrared ray intensity detection type position detection unit 30 may be replaced with a matrix type position detection unit 50 as shown in FIG.

The matrix type position detection unit 50 includes a first array light emitting unit 51, a first array light receiving unit 52, a second array light emitting unit 53, and a second array light receiving unit 54.

The first array light emitting portion 51 is configured such that a plurality of light emitting elements are arranged and mounted on a frame. The first array light emitting unit 51 is arranged on the right side of the screen panel so that infrared rays are arranged in a line to emit infrared rays.

The first array light-receiving section 52 is configured such that a plurality of light-receiving elements are arranged and mounted on a frame. And is arranged at the same interval as the infrared ray sensors of the first array light emitting unit 51 to receive the infrared rays generated by the first array light emitting unit 51 and disposed on the left side of the screen panel 10.

The second array light emitting unit 53 is configured in such a manner that a plurality of light emitting elements are arranged and mounted on a frame. The second array light emitting unit 53 is arranged at the top of the screen panel 10, in which the infrared ray sensors are arranged in a line to emit infrared rays.

The second array light-receiving section 54 is configured such that a plurality of light-receiving elements are arranged on a frame. The second array light receiving portion 54 is arranged at the same interval as the infrared ray sensors of the second array light emitting portion 53 to receive the infrared rays generated by the second array light emitting portion 53, .

The matrix type position detection unit 50 detects the positions of the first array light receiving unit 52 and the second array light receiving unit 54 when an object such as an electronic pen or a finger is located at a specific position on the screen panel. There are light receiving elements in which signals are not received. In this case, the communication terminal generates the y-coordinate of the infrared ray emitting position of the unreceived region of the first array light receiving section 52 in conjunction with the matrix-type position detecting section 50, The infrared ray emitting position is generated as the x coordinate, and the two-dimensional position information is obtained based on the x coordinate and the y coordinate. At this time, the communication terminal transmits the obtained two-dimensional position information to the signer program, inverts the sign information for the position information by the writing mode and the erase mode of the signer program, You can execute the writing function.

In addition, the electronic whiteboard apparatus according to the embodiment of the present invention may further include an electronic pen 60.

7 and 8, the electronic pen 60 includes a body 61, a mode changeover switch 62, a power supply 63, a power switch 64, and a driver 65.

The body portion 61 is provided with a bar-like shape to provide an area in which the presenter S2, who performs the progress such as education, lecture, and presentation, can grasp manually by using the image information irradiated by the projector unit 20. [ . The body portion 61 provides a space in which a mode switching switch 62 and a driving portion 65 can be coupled to be described later so that the body switching portion 62 can be detachably attached to the mode switching switch 62, .

The mode changeover switch 62 outputs a mode change signal to the driver when the contact is touched by the user's operation.

The power supply unit 63 includes a battery (not shown) for supplying power and a power supply circuit (not shown) using a battery, and is electrically connected to the driver 65 to supply power to the driver 65 . The power supply unit 63 supplies power to the drive unit 65 when the power switch 64 is turned on and cuts off power supplied to the drive unit 65 when the power switch 64 is turned off.

The power switch 64 is electrically connected between the power supply unit 63 and the drive unit 65 and is configured to apply the power of the power supply unit 63 to the drive unit 65 when the contact is made by a user's operation .

The driving unit 65 interlocks with the mode changeover switch 62, the power supply unit 63, and the power switch 64 and performs a short-range wireless communication function such as Wi-Fi, ZigBee, and Bluetooth. When the mode switching signal is input from the mode changeover switch 62, the driving unit 65 inputs the mode change signal to the communication terminal through the wireless communication function. In this case, when the mode switching signal is inputted, the communication terminal 40 is switched to the erasing mode when the writing mode of the writer program is executed. On the other hand, when the mode switching signal is inputted, the communication terminal 40 is switched to the writing mode when the erasing mode is executed.

As described above, the electronic copying apparatus according to the embodiment of the present invention can be operated by the educator or the presenter S2 without moving the writing mode and the erasing mode. Therefore, in order to perform the mode switching operation of the writing mode and the erasing mode, The convenience of the presenter or the educator S2 can be improved and the lecture or the presentation can be prevented from being cut off and the lecture or the presentation effect can be improved .

Meanwhile, the electronic whiteboard apparatus according to the embodiment of the present invention may further include a screen control unit 70. [

The screen control unit 70 incorporates a wireless communication function selected from ZigBee, Bluetooth, and WiFi by applying a current to the opaque PDLC film layer 12 without applying a current and converting the current into a transparent state. In this case, the electronic pen 60 also performs wireless communication with the screen control unit 70 by incorporating a wireless communication function corresponding to the screen control unit 70 to perform wireless communication with the screen control unit 70. In this case, the electronic pen 60 may further comprise a screen control switch 66. The screen control switch 66 transmits a contact contact signal to the screen control unit 70 through wireless communication, and performs control driving of the screen control unit 70. [

More specifically, when the screen control switch 66 of the electronic pen 60 is pressed by an educator or a presenter, the electronic pen 60 transmits a contact contact signal to the screen control unit 70 by wireless communication, , The screen control unit 70 releases the current applied to the PDLC film layer 12 in the transparent state to convert the PDLC film layer 12 into an opaque state. Next, when the screen control switch 66 of the electronic pen 60 is pressed again by the presenter or the educator S2, the contact control unit 70 transmits a contact contact signal by wireless communication to the screen control unit 70, A current is applied to the opaque PDLC film layer 12 to convert the PDLC film layer 12 into a transparent state. As described above, the screen control unit 70 applies a current to the PDLC film layer 12 when receiving a signal from the electronic pen 60 in a state in which no current is applied to the PDLC film layer 12, Upon receiving a signal from the electronic pen 60, the PDLC film layer 12 is subjected to a switching operation for releasing current to control the transparent state and the opaque state of the PDLC film layer 12.

As described above, since the electronic copyboard apparatus according to the embodiment of the present invention can control the transparent state and the opaque state of the screen panel 10 using the electronic pen 60, There is no need to move to control the transparent state and the opaque state, the convenience of the presenter or the educator (S2) can be improved, and the lecture or presentation can be prevented from being cut off, thereby improving lecture and presentation effects.

On the other hand, the copyboard apparatus according to the embodiment of the present invention may further include a roll screen 80.

The roll screen 80 is installed between the screen panel 10 and the projector unit 20 and is installed at a predetermined height from the top of the screen panel 10 to the bottom.

Since such a roll sreen 80 prevents the indirect illumination G1 of the indoor space from being directly irradiated to the screen panel 10, the image irradiated on the screen panel 10 in the projector section 20 is subjected to other indirect illumination So that a clearer image can be projected. Here, the space in which indirect lighting is formed is a space in which the projector unit 20 is disposed. In addition to the projector unit 20, an article H1 such as an exhibition article or a billboard can be disposed. In this case, The article H1 of the display article or the billboard can be displayed to the viewers S1 when the display device 10 is switched to the transparent state.

On the other hand, as shown in FIG. 9, the copying apparatus according to the embodiment of the present invention may further include a folding shelf 90.

The folding shelf 90 serves as a cradle to which the projector unit 20 can be seated. For example, the folding shelf 90 may be formed in an 'a' shape to provide a space on the upper surface where the projector unit 20 can be seated, and the 'a' shaped corner portion may be rotatably pin- have. The folding shelf 90 is configured to cover the upper surface of the buried space J1 and the buried space J1 is formed so as to cover the upper surface of the buried space J1. The corner of the folding shelf 90 is rotatably pinned. Further, the folding shelf 90 is engaged with the projector unit 20 by a fastening member (not shown) such as a clamp or a piece screw.

The folding type shelf 90 is pivoted inside the unloading space J1 of the projector unit 20 so that the projector unit 20 is inserted into the embedding space J1, And does not harm the aesthetics of the peripheral space of the apparatus.

The folding shelf 90 is rotated to the outside of the buried space J1 at the time of using the projector unit 20 to expose the projector unit 20 to the outside of the buried space J1 to drive the projector unit 20 The screen panel 10 can be irradiated with an image. In this case, the foldable shelf 90 can be engaged with the upper surface of the foldable shelf 90, and the foldable shelf 90 can be rotated by the rotation of the foldable shelf 90, When the part 20 is moved to the upper part of the embedding space J1, the folding shelf 90 is fixedly moved by a predetermined length and supported on the floor so that the folding shelf 90 is not rotated. Further, when the projector unit 20 is inserted into the embedding space J1, the folding type shelf 90 can be rotated by returning the straight type latch unit 72. [ However, in the embodiment of the present invention, the support drive of the folding shelf 90 is not limited to the above example.

Since the projector unit 20 according to the embodiment of the present invention is disposed on the lower floor of the screen panel 10, the movement and arrangement of the projector unit 20 can be simplified, The projector unit 20 is protected by inserting the projector unit 20 into the embedding space J1 when the projector unit 20 is not used, such as when handwriting is performed using the board marker on the panel 10 At the same time, the aesthetics of the peripheral space of the electronic board device are not harmed.

10, the electronic whiteboard apparatus according to the embodiment of the present invention may include a space J1 in the ceiling and a folding shelf 90 to which the projector unit 20 is coupled, It may be embodied in a form of being embedded in the base J1.

The present invention is not limited to the above-described embodiments, but may be modified in various ways within the scope of the present invention as set forth in the following claims. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

10; A screen panel 11; Transparent material layer
12; A PDLC film layer 13; Adhesive film
14; A light reflectance reducing layer 15; The second transparent material layer
20; A projector section 30; The position detector
31; A left-side array light-emitting portion 32; The right-
33; A lower array light emitting portion 34; The first camera unit
35; A second camera unit 40; Communication terminal
50; A matrix-type position detection unit 51; The first array light-
52; A first array light-receiving section 53; The second array light-
54; A second array-receiving portion 60; Electronic pen
61; A body portion 62; Mode switch
63; A power supply unit 64; Power switch
65; A driving unit 66; Screen control switch
70; A screen control unit 80; Roll screen
90; Folding shelf G1; Indirect lighting
H1; Item J1; Burial space
S1; Viewer S2; Presenter or educator
F1; Beam projector

Claims (11)

A screen panel including a transparent material layer and a PDLC film layer bonded to one side of the transparent material layer;
A projector unit irradiating image information on the PDLC film layer to display an image on the PDLC film layer;
A communication terminal in which a writing program is installed;
And a mode changeover switch for executing a write mode of the writer program when the turner is in a turn-on state and an erase mode of the writer program when the turner is in a turn-off state; And
And an infrared ray intensity detection type position detector for detecting position information of an object on a two-dimensional plane of the screen panel,
The infrared ray intensity detection type position detection unit
A right array light emitting unit installed on the right side of the screen panel and generating infrared rays in a left direction, and a right array light emitting unit installed on the lower side of the screen panel, A first camera unit disposed at an upper portion of the left array emission unit and configured to capture infrared rays generated by the right array emission unit and the lower array emission unit, and a second camera unit installed at an upper portion of the right array emission unit, And a second camera unit for capturing infrared rays generated by the left array light emitting unit and the lower array light emitting unit,
Wherein the communication terminal uses the angle value of the point at which the infrared ray captured by the first camera unit and the second camera unit is stronger and the length value and the width value of the screen panel to convert the position information of the object into two- And generates sign information of the two-dimensional position information on the basis of the calculated sign information. The locus information for the position information is reversed in the left and right direction according to the write mode and the erase mode of the built- And outputs,
Wherein the screen panel is disposed between a viewer who views the image and the projector unit, the projector unit irradiates left and right reversed image information on a first surface of the screen panel, and the PDLC film layer reflects And a light reflectance reducing layer formed of any one of an AG coating, an LR coating and an AR coating for reducing the light amount of the light.
delete The method according to claim 1,
Wherein the screen panel further comprises a second transparent material layer coupled to the surface of the PDLC film layer and opposed to the transparent material layer.
delete delete delete delete The method according to claim 1,
Polymer liquid crystals are dispersed between two sheets of ITO films. When the power is not supplied to both electrodes, the liquid crystal molecules are opaque. When the power is applied, the polymer liquid crystal molecules are arranged in a direction in which current flows Further comprising a screen control unit for switching the state of the PDLC to a transparent state or an opaque state by applying or not applying power to the PDLC film layer which becomes transparent by passing light,
Wherein the screen control unit switches the state of the PDLC film layer to a transparent state or an opaque state based on a contact contact signal of the electronic pen.
The method according to claim 1,
Further comprising a roll screen installed between the screen panel and the projector unit so as to prevent the indirect lighting from being directly irradiated to the screen panel by being installed at a predetermined height from the upper end of the screen panel.
The method according to claim 1,
Wherein the projector unit is embedded in the vicinity of the floor where the screen panel is disposed or in the vicinity of the ceiling.
11. The method of claim 10,
The floor or ceiling is further provided with a buried space,
And a folding shelf provided in the embedding space to provide a space in which the projector section can be seated.

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