KR20160143051A - Transparency board screen apparatus - Google Patents

Transparency board screen apparatus Download PDF

Info

Publication number
KR20160143051A
KR20160143051A KR1020150079106A KR20150079106A KR20160143051A KR 20160143051 A KR20160143051 A KR 20160143051A KR 1020150079106 A KR1020150079106 A KR 1020150079106A KR 20150079106 A KR20150079106 A KR 20150079106A KR 20160143051 A KR20160143051 A KR 20160143051A
Authority
KR
South Korea
Prior art keywords
screen
beam projector
transparent
screen unit
user
Prior art date
Application number
KR1020150079106A
Other languages
Korean (ko)
Inventor
이찬봉
Original Assignee
주식회사 나노렉스
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 나노렉스 filed Critical 주식회사 나노렉스
Priority to KR1020150079106A priority Critical patent/KR20160143051A/en
Publication of KR20160143051A publication Critical patent/KR20160143051A/en

Links

Images

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G03B21/58—Projection screens collapsible, e.g. foldable; of variable area
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/28—Reflectors in projection beam
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3179—Video signal processing therefor
    • H04N9/3188—Scale or resolution adjustment

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Drawing Aids And Blackboards (AREA)
  • Projection Apparatus (AREA)

Abstract

Disclosed is a transparent board screen apparatus which is used simultaneously both as a board to write on and as a screen to display an image outputted by a projector. The transparent board screen apparatus comprises: a screen unit which is made of a transparent panel which you can write on; a beam projector which is installed on the top side or the bottom side of the screen unit to project an image forward; a reflecting mirror which is installed to reflect the image projected by the beam projector and to display the image on the screen unit; and a detector unit which detects a users touch on the screen unit. According to the present invention, a user can use a beam projector even in a small space, and efficiently give a lecture by using a touch method.

Description

Transparent board screen apparatus {TRANSPARENCY BOARD SCREEN APPARATUS}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transparent chalkboard screen device, and more particularly, to a transparent chalkboard screen device used as a chalkboard capable of handwriting and used as a screen for displaying an image output from a projector.

Generally, when lecturing or teaching, a facilitator uses handwriting on a blackboard using chalk, writing on a whiteboard using a water pen or the like, and a separate projector for displaying images or educational contents using a beam projector or the like The screen is installed and used. These blackboards, screens, and projectors are separated from each other, and while they are writing, the screen is lowered to display images, and the beam projector is operated.

Korean Registered Utility Model No. 20-0466688 discloses a writing board combined screen. The screen for both the writing board and the screen can be written using an aqueous pen or the like on the front surface and a video projector or various educational contents can be displayed on the front surface using a beam projector or the like on the rear surface. That is, a diffusion film is provided on the rear surface of the transparent panel so that light emitted from the beam projector is diffused through the diffusion film, thereby preventing glare and uniformly diffusing light. With this configuration, it can be used as a writing board for lecture and a screen for image display, and it can be used interchangeably as an electronic board which can perform lecture and parallel writing on the displayed image.

However, in the above technique, a writing screen and a beam projector must be separately installed. In other words, the position of the beam projector should be adjusted so that the image projected from the beam projector is displayed without distortion on the screen for both the writing board and the writing board by installing a screen for both writing board and the beam projector. Alternatively, if the beam projector is not installed in advance, a separate beam projector must be brought in to adjust the distance from the screen to the writing board. This may take a long time to prepare lectures and lessons, which may shorten the time for lectures.

In addition, since the touch screen and the operation screen are not provided on the screen of the above-described technique, the host needs to switch the screen by operating an external device connected to the beam projector. That is, although the handwriting can be performed on the screen displayed on the handwriting board screen through the handwriting board screen, it is not possible to perform a function of switching the screen by touching the image.

Korea Registered Utility Model No. 20-0466688 (Registered on April 25, 2013) Korean Patent Publication No. 2002-0033454 (published May 5, 2002) Korean Patent Publication No. 10-2011-0084585 (Published on July 26, 2011)

Accordingly, it is an object of the present invention to provide a transparent chalkboard screen device having not only handwriting and visual display, but also a touch and motion recognition function, and an integrated beam projector for enhancing user's convenience and improving lap concentration.

According to another aspect of the present invention, there is provided a transparent chalkboard screening apparatus including a screen unit formed of a transparent writing panel, a beam projector disposed on an upper side or a lower side of the screen unit to project an image forward, A reflector installed to reflect the projected image and to be displayed on the screen unit, and a sensing unit for sensing a user touch or operation on the screen unit.

And the beam projector switches a screen projected by the beam projector according to a touch or an operation of the user sensed through the sensing unit.

Wherein the screen unit is formed by forming a semi-transparent or opaque display film on the surface of the transparent panel so that an image projected from the beam projector is formed, or the semi-transparent or opaque display film is inserted between the pair of the transparent panels .

The transparent chalkboard screen device of the present invention may further include a roll screen installed on the rear surface of the screen unit so as to project an image projected from the beam projector.

The sensing unit senses a user's touch by a matrix structure formed by arranging an infrared ray (IR) LED and a phototransistor so as to face each other, detects a touch of a user in a face contact manner, or senses through a camera sensor .

The transparent blackboard screen device of the present invention further includes an interface device for receiving various contents from an external device, transmitting the contents to the beam projector, and performing an interface with the external device, wherein the interface device includes software .

And the screen portion is formed using a transparent / opaque conversion film.

According to the transparent chalkboard screen apparatus of the present invention, a beam projector is installed so that the image is projected on the upper side or the lower side of the screen portion, and the image projected from the beam projector through the reflector is displayed on the screen portion, It is possible to use it in a narrow space.

In addition, by sensing the user's touch through the sensing unit and switching the screen projected by the beam projector, the lecture can be conveniently performed, and the display unit can be coated with a display film which is not observed on one surface, By installing a roll screen, there is a privacy effect when a wall or partition is used as a screen part.

1 is a perspective view illustrating the construction of a transparent blackboard screen apparatus according to an embodiment of the present invention;
FIG. 2 is a view for explaining a touch sensing function of the transparent blackboard screen device according to an embodiment of the present invention, and FIG.
3 is a side view for explaining the construction of a transparent chalkboard screen device according to another embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings, It will be possible. The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. It should be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprising" or "having ", and the like, are intended to specify the presence of stated features, integers, steps, operations, elements, parts, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, parts, or combinations thereof.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

Hereinafter, a transparent chalkboard screen device according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view illustrating the construction of a transparent blackboard screen apparatus according to an embodiment of the present invention, and FIG. 2 is a view for explaining a touch sensing function of the transparent blackboard screen apparatus according to an embodiment of the present invention.

1, the transparent chalkboard screen device of the present invention includes a screen unit 100, a beam projector 120, an interface device (not shown), a reflector 140, and a sensing unit 160.

The screen unit 100 is formed of a writable transparent panel, and the transparent panel is selected from transparent panel panels having transparency such as tempered glass, acrylic panel, or polycarbonate panel. The screen unit 100 can be handwritten using a water-based pen or a board marker (a pen for a whiteboard), and handwritten text or graphics can be easily erased.

When the screen unit 100 illuminates the projector, a display film on which images are formed on both sides is formed on the surface of the transparent panel. Specifically, a translucent display film that is observed on one side of the transparent panel or an opaque display film on which the other side is not observed can be coated or adhered to form an image. Alternatively, the screen unit 100 may be formed of two transparent panels, and the above-described translucent or opaque display film may be inserted between the two transparent panels.

The screen unit 100 can be installed in a wall or a partition, and the other side of the screen unit 100 is not observed by the display film. Accordingly, it is also possible to use a screen body 100 by coating a display film on a wall or a partition made of a transparent panel such as glass. In this case, since the room can not be seen from the outside, it is effective for protection of privacy and the like.

The beam projector 120 is installed to project an image on the upper side or the lower side of the screen unit 100 forward. In FIG. 1, the beam projector 120 is provided below the screen unit 100. The beam projector 120 is adjustable in height and can be adjusted vertically and horizontally, and the projected image is projected onto a reflector (140) and displayed on the screen unit (100). If the screen unit 100 is installed on a wall or a partition, the beam projector 120 is installed so that the image is projected forward on a wall or partition provided with the screen unit 100.

The interface device is connected to an external device such as a computer or a smart phone, receives various contents from an external device, transmits the contents to the beam projector 120, and performs an interface with the external device. That is, it receives a video signal from an external device and transmits a user command to the external device. Here, the user command is generated by the user's touch sensed through the sensing unit 160, which will be described later, and the interface device transmits the user command to the external device.

In addition, the interface device can incorporate customized software for a specific customer base. Namely, specialized software such as advertisement or education can be installed in the interface device to improve user convenience. For example, when the screen unit 100 is installed on a wall, advertisement software is installed in the interface device, and advertisement characters are displayed on the lower side of the screen unit 100, or the advertisement software is displayed in a pop-up window Information about the product can be provided to the user. In the case of education, a separate program necessary for education can be stored and displayed in the interface device. Therefore, it is possible to embed software specialized for each user through the interface device, thereby providing an optimized user environment for a specific user layer.

The reflector 140 is installed so that an image projected from the beam projector 120 is reflected and displayed on the screen unit 100. 1 shows a case where the beam projector 120 is installed on the lower side of the screen unit 100 and the reflector 140 is also installed on the lower side of the screen unit 100 so that the shadow of the user is formed on the screen unit 100 . When the beam projector 120 is installed on the upper side of the screen unit 100, the reflector 140 is installed on the upper side of the screen unit 100 so that the image projected from the beam projector 120 is reflected. Here, the reflecting mirror 140 can be adjusted up and down and right and left to adjust the reflection angle.

As described above, since the beam projector 120 is installed on the upper side or the lower side of the screen unit 100 and the screen is projected on the screen unit 100 using the reflector 140, 100, and it is not necessary to separate the installation position of the beam projector 120 from the screen unit 100, so that it can be used in a narrow space.

In addition, since the beam projector 120 and the reflector 140 are detachably installed in the present invention, the beam projector 120 and the reflector 140 are detachably attached to and removed from the frame in case of need or storage. Accordingly, when the screen unit 100 is installed on a wall or a partition and is not used, the beam projector 120 and the reflector 140 can be detached and stored, and the wall or partition can be used as a wall or a partition as it is.

 The sensing unit 160 senses a user touch on the screen unit 100. 2, the sensing unit 160 includes a plurality of IR (Infra Ray) LEDs 161 and 163 and a plurality of phototransistors 162 and 164 arranged to face each other, The touch of the user is detected. That is, the sensing unit 160 senses the touch by matching the coordinates of the matrix generated by intersecting the plurality of IR LEDs 161 and 163 with the plurality of phototransistors 162 and 164, with the image displayed on the screen unit 100 It is possible.

2, when the user touches a predetermined point on the screen unit 100, the infrared ray output from the horizontal IR LED 161 does not reach the horizontal phototransistor 162 and the vertical IR LED 163 are not detected by the horizontal phototransistor 164 is detected. The beam projector 120 analyzes the image data displayed at this point and generates a user command. That is, the beam projector 120 switches the screen projected from the beam projector 120 according to the touch of the user sensed through the touch monitor 160, and outputs the screen.

For example, when a menu for adjusting brightness or color of a screen is projected by the beam projector 120 and displayed on the screen unit 100, in response to a user's touch sensed through the sensing unit 160, The brightness and color of which is adjusted are projected from the beam projector 120. That is, when a menu for adjusting the brightness or color of the screen is displayed on the screen unit 100, the user can touch the screen unit 100 to operate the menu. The user touch sensed through the sensing unit 160 is transmitted to the beam projector 120 so as to adjust the brightness or color of the screen and output it.

The beam projector 120 is connected to an external device such as a computer or a smart phone and can receive a video signal. When an external device is connected to the Internet, an internet screen transmitted from an external device is transmitted through a beam projector 120 (100). When the user touches the Internet screen displayed on the screen unit 100, a user command to display the Internet screen connected to the clicked link on the screen unit 100 according to the user's touch sensed through the sensing unit 160 To the external device.

That is, when the Internet screen is displayed on the screen unit 100, the user can touch the screen unit 100 and click the Internet link. When the user clicks on the Internet screen displayed on the screen 100, the touch of the user is sensed through the sensing unit 160 and transmitted to the beam projector 120. The beam projector 120 generates a user command to switch to the Internet screen connected to the clicked link and transmits it to the external device. In the external device, the Internet screen connected to the clicked link is transmitted to the beam projector 120 according to a user command, and the switched internet screen is displayed on the screen unit 100 through the beam projector 120.

3 is a side view for explaining the construction of a transparent chalkboard screen device according to another embodiment of the present invention.

Referring to FIG. 3, the blackboard screen device includes a screen unit 200, a beam projector (not shown), a reflector (not shown), a sensing unit 210, and a roll screen 220.

The screen unit 200 is formed of a writable transparent panel, and the transparent panel is selected from transparent panels having transparency such as tempered glass, acrylic panel, or polycarbonate panel. The screen unit 200 can be handwritten using a water-based pen or a board marker (white board pen), and handwritten text or graphics can be easily erased.

The beam projector is installed such that the image is projected on the upper side or the lower side of the screen unit 200 in the forward direction. In addition, the beam projector is adjustable in height and can be adjusted vertically and horizontally, and is arranged so that the projected image is reflected on a reflector (to be described later) and displayed on the screen unit 200. The beam projector has an interface device (not shown) to which an external device such as a computer or a smart phone is connected. The video projector receives an image signal from an external device through the external device interface, and transmits a user command to the external device.

The reflector is installed above or below the screen unit so that the image projected from the beam projector is reflected and displayed on the screen unit 200. When the beam projector is installed on the upper side of the screen unit 200 and the reflector is also provided on the upper side of the screen unit 200 and the beam projector is installed on the lower side of the screen unit 200, Respectively.

The sensing unit 210 senses a user touch on the screen unit 200. More specifically, the sensing unit 210 senses a touch of a user by arranging a plurality of IR (Infra Ray) LEDs and a plurality of phototransistors so as to face each other.

The detailed configuration and operation principle of the beam projector, the reflector, and the sensing unit described above are the same as those described above with reference to FIG. 1 and FIG. 2, and will not be described.

The roll screen 220 is installed on the rear surface of the screen unit 100 and is used as it is stretched as needed. That is, the roll screen 220 is unfolded from the winding unit 230 so that the user can display the image projected through the beam projector well or display the written contents on the screen unit 200 formed of the transparent panel .

Instead of the roll screen 220, a translucent or opaque display film may be coated or adhered to another transparent panel and then installed on the screen unit 200 for use. In this case, when the feeling of openness is needed, the display film is lifted up to 90 degrees from the other transparent panel coated or attached, and the transparent panel is used down when writing or using a beam projector. When the display film is lowered on another transparent panel coated or attached thereto, the overall transparency of the screen portion is lowered, so that the readability of the written contents is increased and the sharpness of the projected image is enhanced.

Here, the screen unit 200 may be formed by coating a transparent panel with a display film on which images are formed on both sides, when the projector is illuminated. In this case, the roll screen 220 installed on the rear surface may be unfolded so that the screen unit 200 can be displayed in more detail.

In the above embodiments, the IR LEDs 161 and 163 and the phototransistors 162 and 164 are used. However, when touching the screen units 100 and 200, . That is, a touch sensing film or a glass may be attached to the screen units 100 and 200 to receive a user command through the touch sensing film.

Also, a method of recognizing an operation using a camera sensor may be applied. In this case, a camera sensor is installed on one side of the screen units 100 and 200, and the operation of the user recognized through the camera sensor is analyzed and processed. That is, if the user moves his or her hand to the left or right, the screen can be changed back and forth, and a simple and frequent operation can be recognized through the hand operation.

The screen portions 100 and 200 may be configured using a transparent / opaque conversion film (a film that converts into a transparent or opaque state upon power application). A magic film is a conversion film formed by forming an electrode using two ITO (Indium Tin Oxide) and then depositing or coating a polymer dispersed liquid crystal (PLDC) on the magic film or magic film. Magic glass is formed by inserting electrodes with ITO between glass, PC (Polycarbonate), and acrylic.

Here, the transparent / opaque conversion film refers to a film that is instantly changed from an opaque state to a transparent state by applying power. In addition, the transparent / opaque conversion film is connected to an external power source to provide a function of converting a transparent transparent window into opaque state while the power is off, and maintaining transparency of the transparent transparent window when power is applied.

As described above, the transparent / opaque conversion film can freely produce transparency of a transparent transparent window according to a change in voltage, and has the advantage of being able to freely produce a size and a shape.

In this case, it is unnecessary to additionally use a roll screen or another transparent panel which is lifted up to 90 degrees. The screen units 100 and 200 thus formed are normally opaque, and when the beam projector is irradiated, images can be formed on both sides.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined in the appended claims. It can be understood that it is possible.

100, 200: screen unit 120: beam projector
140: Reflector 160, 210:
161, 163: IR LEDs 162, 164: photo transistor
220: roll screen 230: winding part

Claims (8)

A screen portion formed of a writing-enabled transparent panel;
A beam projector installed to project an image forward or downward from the screen unit;
A reflector provided so that an image projected from the beam projector is reflected and displayed on the screen unit; And
And a sensing unit for sensing a user's touch or operation on the screen unit. The method according to claim 1,
The beam projector includes:
Wherein the control unit switches the screen projected by the beam projector according to a touch or an operation of the user sensed through the sensing unit. The method according to claim 1,
The screen unit includes:
So that an image projected from the beam projector is formed,
A translucent or opaque display film is formed on the surface of the transparent panel, or
Wherein the translucent or opaque display film is inserted between a pair of the transparent panels. The method according to claim 1,
And a roll screen installed on the rear surface of the screen unit so as to form an image projected from the beam projector. The method according to claim 1,
The sensing unit includes:
A touch of a user is sensed by a matrix structure formed by arranging an infrared ray (IR) LED and a phototransistor so as to face each other, a touch of a user is sensed in a face contact manner, or a sensed by a camera sensor A transparent chalkboard screen device. The method according to claim 1,
Further comprising an interface device for receiving various contents from an external device, transmitting the contents to the beam projector, and performing an interface with the external device. The method according to claim 6,
Wherein the interface device is capable of embedding customized software for a specific customer layer. The method according to claim 1,
The screen unit includes:
And a transparent / translucent conversion film.
KR1020150079106A 2015-06-04 2015-06-04 Transparency board screen apparatus KR20160143051A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150079106A KR20160143051A (en) 2015-06-04 2015-06-04 Transparency board screen apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150079106A KR20160143051A (en) 2015-06-04 2015-06-04 Transparency board screen apparatus

Publications (1)

Publication Number Publication Date
KR20160143051A true KR20160143051A (en) 2016-12-14

Family

ID=57575862

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020150079106A KR20160143051A (en) 2015-06-04 2015-06-04 Transparency board screen apparatus

Country Status (1)

Country Link
KR (1) KR20160143051A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180101082A (en) 2017-03-03 2018-09-12 김민지 board for multipurpose
KR20220104649A (en) * 2021-01-18 2022-07-26 (주)크레스코글로벌 the improved theater system of screen door

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020033454A (en) 2002-04-17 2002-05-06 백태선 Moving picture display apparatus into the blackboard
KR20110084585A (en) 2010-01-18 2011-07-26 박윤근 Board for window
KR200466688Y1 (en) 2012-08-27 2013-05-02 방재홍 Combined writing board screen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020033454A (en) 2002-04-17 2002-05-06 백태선 Moving picture display apparatus into the blackboard
KR20110084585A (en) 2010-01-18 2011-07-26 박윤근 Board for window
KR200466688Y1 (en) 2012-08-27 2013-05-02 방재홍 Combined writing board screen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180101082A (en) 2017-03-03 2018-09-12 김민지 board for multipurpose
KR20220104649A (en) * 2021-01-18 2022-07-26 (주)크레스코글로벌 the improved theater system of screen door

Similar Documents

Publication Publication Date Title
KR101831350B1 (en) Camera-based multi-touch interaction and illumination system and method
US8842076B2 (en) Multi-touch touchscreen incorporating pen tracking
US9268413B2 (en) Multi-touch touchscreen incorporating pen tracking
US8502789B2 (en) Method for handling user input in an interactive input system, and interactive input system executing the method
US6478432B1 (en) Dynamically generated interactive real imaging device
Schöning et al. Building interactive multi-touch surfaces
US20090231281A1 (en) Multi-touch virtual keyboard
KR20170051481A (en) Touch blackboard, touch blackboard frame, touch all-in-one machine and combined blackboard
US20230057020A1 (en) Meeting interaction system
KR20140000436A (en) Electronic board system using infrared camera
KR101312018B1 (en) Electronic Board System and Drive Method of the Same
CN205028278U (en) Interactive display device of rear -projection formula
KR101756948B1 (en) Apparatus of electronic bulletin board
KR20160143051A (en) Transparency board screen apparatus
JP6632429B2 (en) Information display device and information display method
US9733738B2 (en) System and method for communication reproducing an interactivity of physical type
Kudale et al. Human computer interaction model based virtual whiteboard: A review
Maierhöfer et al. TipTrack: Precise, Low-Latency, Robust Optical Pen Tracking on Arbitrary Surfaces Using an IR-Emitting Pen Tip
KR20180016780A (en) Electronic board activating touch area according to user's approach, method for activating touch area of electronic board using the same
KR20100003661U (en) Board having a note board function and display screen function
Izadi et al. Experiences with building a thin form-factor touch and tangible tabletop
JPH0544586U (en) Blackboard with screen
CN203376718U (en) Interactive infrared touch desktop display system
Basumatary et al. Ultra low Cost Interactive Whiteboard using Computer Vision Techniques: A Review
TWM620019U (en) Intelligent flat touch blackboard

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
AMND Amendment
E90F Notification of reason for final refusal
AMND Amendment
E601 Decision to refuse application
AMND Amendment
E902 Notification of reason for refusal
AMND Amendment