KR20200072265A - White Board Display Device for using Shutter typed PDLCD - Google Patents

Abstract

According to an embodiment of the present invention, a white board image device using a shutter type PDLDC comprises: a PDLDC layer that mixes a polymer and liquid crystal to appear opaque by scattering light when electricity is not applied and appear transparent by passing light when the electricity is applied; an image device that outputs information input from the outside or outputs prestored information through a screen; an AR film bonded to one side of the PDLDC layer on the opposite side of the image device to reduce reflection by external light to improve visibility; and a digitizer attached to a rear surface of the image device, and recognizing and transmitting coordinates according to the movement of an electronic pen or a cursor by a user. Therefore, by using the operation principle of a PDLCD, the white board image device can have both an image device electronic board function and a white board function, and can also have a function of an electronic frame.

Description

White Board Display Device for using Shutter typed PDLCD}

The present invention relates to a whiteboard imaging device using a shutter-type PDLCD (Polymer Dispersed Liquid Crystal Display). More specifically, a shutter-type PDLCD is integrally manufactured on the front of the imaging device to enable a whiteboard function. It relates to a whiteboard imaging device using a shutter-type PDLCD having a function as a board by using an electronic pen through a digitizer attached to the back.

In general, the blackboard is used to explain the content of a class or lecture, or to give a presentation at a conference or presentation, not only in a classroom in a school, but also in a classroom or a company office.

In order to conduct classes or lectures, auxiliary equipment such as video equipment is often used together. On the auxiliary table prepared separately from the blackboard, video equipment such as TVs and monitors are placed and lectured. As a result, the blackboard and video equipment are separated from each other. As a result, it was inconvenient to give lectures in connection with video equipment, and the focus on lectures was distributed.

The method of recording on the electronic blackboard according to the prior art records the trajectory when the pen is moved in a contact or non-contact manner on the touch panel to display the trajectory on the screen or to display the infrared light emission and light-receiving sensors invisible to the human eye on the horizontal and vertical axes. There is a method of arranging and reading a position where a person's hand or pen blocks infrared rays and recording it on the screen according to the movement of the hand or pen.

The conventional method using a touch panel has a problem of adding a transparent touch panel to a general monitor and using it as a lowered brightness depending on the transparency of the touch panel from the luminance of the liquid crystal display device due to the characteristic of reading the location where the contact has occurred. The problem is that it is difficult to pay and the price is higher than other methods.

Due to the property that the glass plate of the part that the user touches must be made thin, it is weak to shock or scratches, and the infrared light emitting and light-receiving sensors are regularly arranged on the horizontal and vertical axes to read the infrared blocking position. And infrared sensors have limitations in increasing resolution due to interference problems, so the readability of precise locations is relatively poor.

In Korean Publication No. 10-2014-0110426, the electromagnetic field type tablet sensor can be enlarged to realize pressure sensing, increase the touch-sensing speed, improve the accuracy of touch detection, and provide an image sensor and an electromagnetic field sensor capable of fine writing. Disclosed is an electronic induction type electronic blackboard system and an electronic blackboard operating method.

1 is a schematic diagram of an electronic induction type electronic blackboard system according to the prior art, and FIG. 2 is an exploded perspective view of the electronic induction type electronic blackboard in FIG. 1.

1 to 2, an electronic induction type electronic blackboard system provided with an image sensor and an electromagnetic field sensor according to the prior art is composed of an electronic blackboard 100, an electronic pen 200, and a controller (not shown).

The electronic blackboard 10 includes a frame 11 surrounding the electronic blackboard, a touch panel 12 positioned at the rear of the frame 11, and a plurality of image sensors installed at corner portions of the front surface of the touch panel 12. (13), located on the rear of the touch panel (12), the electromagnetic field sensor antenna board 14 is equipped with an electromagnetic field sensor, the image sensor 130 and the electromagnetic field sensor antenna board 14 for controlling the MCU (Micro It consists of a controller (15) equipped with a Controller Unit.

When the electronic blackboard 10 further includes an infrared camera (not shown), the infrared camera may be mounted in the image sensor 130, and the touch panel 120 may be divided into multiple screens, so that learning contents are displayed. It can be divided into a learning window, a content window in which content related to the learning content is displayed, and a dialog window in which questions or answers can be answered using text.

The image sensor 13 detects the user's finger touching the touch panel 120 by the operation of the built-in infrared camera and informs the control unit 15, and the electromagnetic field sensor antenna board 14 is a tablet antenna board. And, when the electronic pen 20 approaches or touches the touch panel 120, the electronic induction is changed to detect the touch position and touch intensity and notify the controller 15.

The controller 15 equipped with the MCU dataizes the touch position detected by the image sensor 13, A/D converts it, and displays the A/D converted value as a coordinate value. The magnetic field of the electronic pen 20 detected by the electromagnetic field sensor antenna board 14 is dataized, A/D converted, and the A/D converted value is represented as a coordinate value.

By displaying the coordinate values on the touch panel 12, the control unit 15 enables the writing of the writing according to the touch position and the touch intensity, thereby allowing the writing and drawing of various thicknesses to perform fine writing. . The control unit 15 controls the image sensor 13 and the electromagnetic field sensor antenna board 14 so that the image sensor 130 and the electromagnetic field sensor antenna board 14 do not collide with each other.

The electronic pen 20 includes a touch member 21 that touches the surface of the touch panel 12, and the touch member 21 is made of magnetic rubber that has a sharp end and can be bent. The touch member 21 is made of a magnetic material that causes a change in the electrostatic induction of the electromagnetic field sensor antenna board 14 to generate magnetism by itself, when approaching the touch panel 12 or touching the touch panel 20 Causes a change in electromagnetic induction in the proximity or touch area.

In the case of the electronic blackboard according to the prior art, there is an improvement over the existing white board, but there is still an inconvenience when the lecturer alternately uses the electronic blackboard and the white board.

The problem to be solved in the present invention is to provide a whiteboard imaging device using a shutter-type PDLCD that can simultaneously use two functions of the electronic blackboard and the whiteboard with one electronic blackboard without installing separate equipment in the classroom and meeting room. Is to do.

A whiteboard imaging device using a shutter-type PDLCD according to an embodiment of the present invention mixes a polymer and a liquid crystal to scatter light when electricity is not applied and appears opaque. When electricity is applied, it appears transparent by passing light through. A PDLCD layer, an image device that outputs information received from the outside or outputs pre-stored information through a screen, and an AR that is bonded to one side of the PDLCD layer on the opposite side to the image device to improve visibility by reducing reflection from external light (Anti-reflection) film and a digitizer attached to the back of the imaging device, the user recognizes the coordinates according to the movement of the electronic pen or cursor and delivers it to the imaging device.

A whiteboard imaging device using a shutter-type PDLCD according to an embodiment of the present invention is formed to a thickness of 1 mm or less between the PDLCD layer and the imaging device to join the PDLCD layer and the imaging device, and display the imaging device. Optical Bonding further improves the visibility of information.

In an embodiment of the present invention, the PDLCD layer may provide a function of a whiteboard to the user by scattering the light passing through when the electricity is not applied to make the surface opaque.

In an embodiment of the present invention, the PDLCD layer is produced by forming a PDLC layer between two films made of an ITO (Indium Thin Oxide) layer, and using EVA films on both outer sides of the ITO layer to form a glass. It can be produced by bonding.

In an embodiment of the present invention, the PDLC layer is formed to be cured through UV or heat after coating on the ITO film to 20 μm or less, and the ITO film used at this time has a resistance value of 80 to 150 MPa.

A whiteboard imaging device using a shutter-type PDLCD according to an embodiment of the present invention may utilize both an imaging device board (electronic board) function and a whiteboard function by utilizing the operating principle of the PDLCD.

In addition, the whiteboard imaging device using the shutter-type PDLCD according to an embodiment of the present invention can be utilized as a function of an electronic picture frame utilizing the functions of the PDLCD.

In addition, the whiteboard imaging device using the shutter-type PDLCD according to an embodiment of the present invention may function as a tempered glass for preventing the PDLCD from damaging a general imaging device.

In addition, in the whiteboard imaging device using the shutter-type PDLCD according to an embodiment of the present invention, the AR layer coated on the outer surface of the PDLCD glass may reduce reflection of light to improve visibility of the imaging device screen.

In addition, the whiteboard imaging device using the shutter-type PDLCD according to an embodiment of the present invention can mechanically increase efficiency compared to using a touch function with an existing TSP by using a digitizer.

1 is a schematic diagram of an electronic induction type electronic blackboard system according to the prior art.
Figure 2 is an exploded perspective view of an electronic induction type electronic blackboard according to the prior art.
3 is a schematic diagram of a whiteboard imaging device using a shutter-type PDLCD according to an embodiment of the present invention.
4 is a conceptual diagram of an operation of a PDLCD (Polymer Dispersed Liquid Crystal Display) applied to an embodiment of the present invention.
FIG. 5 is an exemplary view using a connection between a PDLCD and an imaging device to improve visibility applied to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, when adding reference numerals to the components of each drawing, it should be noted that the same components have the same reference numerals as possible even though they are displayed on different drawings. In addition, in describing the present invention, when it is determined that detailed descriptions of related well-known configurations or functions may obscure the subject matter of the present invention, detailed descriptions thereof will be omitted, and terms described in the singular may include a plurality of concepts. . In addition, although preferred embodiments of the present invention will be described below, the technical spirit of the present invention is not limited to or limited thereto, and can be variously implemented by a person skilled in the art.

The whiteboard imaging device 100 using a shutter-type PDLCD according to an embodiment of the present invention manufactured an integrally formed shutter-type PDLCD capable of an On/Off function on the front surface of a conventional imaging device. When the power is applied, the PDLCD is turned on and remains transparent. On the contrary, when the PDLCD is turned off, the PDLCD becomes opaque and remains white. The whiteboard imaging device 100 using a shutter-type PDLCD according to an embodiment of the present invention can be utilized as an electronic blackboard through a driving principle in a transparent state when using a screen that comes out. Can be used as a board.

3 to 5, a whiteboard imaging device using a shutter-type PDLCD according to an embodiment of the present invention will be described in detail.

FIG. 3 is a schematic diagram of a whiteboard imaging device using a shutter-type PDLCD according to an embodiment of the present invention, and FIG. 4 is a conceptual diagram of operation of a PDLCD (Polymer Dispersed Liquid Crystal Display) applied to an embodiment of the present invention. 5 is an exemplary view using a connection between a PDLCD and an image device applied to an embodiment of the present invention.

Whiteboard imaging device 100 using a shutter-type PDLCD according to an embodiment of the present invention includes a PDLCD layer 110, an AR coating layer 130 bonded to one side of the PDLCD layer 110, and a PDLCD layer 110. It includes an image device 140 bonded to the other side, and a digitizer 150 bonded to the opposite side of the image device 140 to which the PDLCD layer 110 is bonded.

The PDLCD layer 110 applied to an embodiment of the present invention includes a PDLC layer 111, two indium thin oxide (ITO) film layers 112 forming the PDLC layer 111, and two ITO film layers Each of (112) is composed of two pieces of glass (114) bonded to the PDLC layer (111) and the EVA film (113) on the opposite side.

The PDLC layer 111 may affect the transmittance characteristics in a transparent state according to the coating thickness, and the technique is to maintain a uniform coating uniformity. The resistance value of the ITO film 112 is generally about 80 to 150 kV, and may affect characteristics according to an applied voltage according to the resistance value used.

The thus produced PDLCD film 110 is placed between two sheets of tempered glass 114 and bonded with an EVA (Ethylene vinyl Acetate) film 113. Heat treatment is performed at high temperature to remove air bubbles that may be generated during the bonding process.

PDLCD (Polymer Dispersed Liquid Crystal Display) is a mixture of polymer and liquid crystal, and when electricity is not applied, the liquid crystal molecules are arranged in disorder and scattered to make light appear opaque. When electricity is applied, the liquid crystal molecules are aligned in the direction in which the electric field is formed. It is a kind of display that uses the principle of being transparent by passing light.

Looking at the manufacturing process of the PDLCD layer 110 applied to an embodiment of the present invention, a fine coating of the PDLC (polymer liquid crystal) layer 111 between two films formed with an ITO (Indium Thin Oxide) layer 112 ( About 20um) to cure through UV or heat. Between the cured polymer layers, liquid crystal molecules form droplets at regular intervals, and when an electric field is formed through the ITO layer 112, the liquid crystal molecules located in the quadrature operate to switch to a transparent or opaque shutter type. The PDLCD layer 110 is completed.

The PDLC layer 111 may affect the transmittance characteristics in a transparent state according to the coating thickness, and the technique is to maintain a uniform coating uniformity. The resistance value of the ITO film 112 is generally about 80 to 150 kV, and may affect characteristics according to an applied voltage according to the resistance value used.

The thus produced PDLCD film 110 is placed between two sheets of tempered glass 114 and bonded with an EVA (Ethylene vinyl Acetate) film 113. Heat treatment is performed at high temperature to remove air bubbles that may be generated during the bonding process.

The thickness of the tempered glass 114 used for bonding uses a product of 1 to 3 mm, and the AR film 130 is additionally attached to the outside or AR coated to reduce reflection by external light to improve visibility.

Looking at the bonding process of the PDLCD layer 110 and the imaging device 140 with reference to FIG. 5, when the PDLCD layer 110 is bonded to the imaging device 140, an optical curing agent 120 is utilized to utilize the imaging device ( 140).

In general, the PDLCD layer 110 and the imaging device 140 may be fixed and bonded with an external metal frame, but in order to improve visibility when driving the screen of the imaging device 140, in the present invention, optical bonding 120 Technology was utilized.

In the case of bonding with a metal frame, an air gap occurs between the PDLCD layer 110 and the imaging device 140, thereby increasing reflectivity and deteriorating visibility characteristics. The thickness of the optical bonding 120 is about 1 mm, and quality can be improved through thickness control.

In one embodiment of the present invention, the digitizer 150 is attached to the back of the imaging device 130, and the user can be used as an input tool by recognizing coordinates according to the movement of the electronic pen or cursor and transmitting them to the system.

When an alternating current (AC) whose direction changes frequently is supplied to the digitizer 150 attached to the rear surface of the imaging device 140, a magnetic field is formed around the imaging device 140.'A current is formed in a space where the magnetic field changes'. According to Faraday's law of electromagnetic induction, a current flows through the coil in the pen. The pen that is supplied with energy generates a specific RF that can be recognized by the digitizer 150 through the internal circuit of the pen, and the digitizer receiving the signal calculates the position and intensity of the signal and displays it on the display.

The imaging device 100 according to an embodiment of the present invention can utilize both the imaging device board (electronic board) function and the whiteboard function by utilizing the transparent-opaque operation principle of the PDLCD layer 110, and the PDLCD layer 110 ) Can also be used as a function of the electronic picture frame. The PDLCD layer 110 may function as a tempered glass to prevent damage to a general imaging device, and the AR layer 130 coated on the outer surface of the glass 114 may reduce light reflection to improve visibility. In addition, the digitizer 150 can be used to mechanically increase the efficiency compared to the use of a touch function with an existing touch panel.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains can make various modifications, changes, and substitutions without departing from the essential characteristics of the present invention. will be. Therefore, the embodiments disclosed in the present invention and the accompanying drawings are not intended to limit the technical spirit of the present invention, but to explain the scope of the technical spirit of the present invention. . The scope of protection of the present invention should be interpreted by the claims below, and all technical spirits within the equivalent range should be interpreted as being included in the scope of the present invention. In addition, claims that do not have an explicit citation relationship in the claims can be combined to form an embodiment or included as a new claim by correction after filing.

110: PDLCD layer
111: PDLC layer
112: ITO layer
113: EVA film
114: glass
120: optical bonding
130: AR coating layer
140: video device
150: digitizer

Claims (5)

A mixture of a polymer and a liquid crystal to scatter light when electricity is not applied and appear opaque; when electricity is applied, a PDLCD layer that appears transparent by passing light;
An image device that outputs information received from the outside or outputs previously stored information through a screen;
An AR film bonded to one side of the PDLCD layer on the opposite side of the imaging device to improve visibility by reducing reflection by external light; And
A digitizer attached to a rear surface of the image device, the user recognizing coordinates according to the movement of the electronic pen or cursor, and transmitting the coordinates to the image device;
Whiteboard imaging device using a shutter-type PDLCD comprising a. According to claim 1,
White using a shutter-type PDLCD further comprising an optical bonding formed between the PDLCD layer and the imaging device to a thickness of 1 mm or less to bond the PDLCD layer to the imaging device and improve visibility of display information of the imaging device. Board imaging equipment. According to claim 1,
The PDLCD layer is a whiteboard imaging device using a shutter-type PDLCD, characterized in that it provides a function of a whiteboard to a user by scattering the light passing through when electricity is not applied to make the surface opaque. According to claim 1,
The PDLCD layer is formed by bonding ITO (Indium Thin Oxide) layers on both sides around the PDLC layer, and forming glass by using EVA films on both outer sides of the ITO layer. Whiteboard imaging equipment. According to claim 4,
The ITO layer is cured through UV or heat to 20 µm or less to bond the PDLC layer with the EVA film, and has a resistance value of 80 to 150 화이트. A whiteboard imaging device using a shutter type PDLCD.

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