JP4102209B2 - Dimming screen device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a light control screen device having various functions such as a whiteboard, an electronic whiteboard, and a projector.
[0002]
[Prior art]
When giving a presentation using a projector at a meeting or a meeting, or when using a whiteboard as in the past, if a dedicated board or screen was exchanged for each situation, a great deal of time was required for operation. In short, it will hinder efficient proceedings. Therefore, various devices have been proposed that can switch to a conference or projector screen using a single whiteboard, but switching takes time or the screen remains constant. Many devices need to repeat the operation of turning on and off the room lighting.
As an apparatus having both a whiteboard (blackboard) and a screen, for example, Japanese Utility Model Publication No. 5-44586, “Blackboard with Screen” (Wacom Co., Ltd.) has a plate-shaped transmission screen supported by a support mechanism. A configuration in which a blackboard is slidably or rotatably attached is disclosed.
In Japanese Utility Model Publication No. 7-5789, “Writing Board Device” (Sakura Seiki Co., Ltd.), an arbitrary surface is provided by rotating a board body having a writing surface on one side and a screen surface for projection on the back side. An apparatus for displaying is disclosed.
Japanese Patent Laid-Open No. 4-110839 “Projector” (Brother Kogyo Co., Ltd.) is equipped with a screen and a projection means that is provided integrally with the screen and projects from the back surface of the screen. There is disclosed a technique that enables the screen to be moved while being projected, and that allows the projected content and the like to be copied.
In Japanese Utility Model Publication No. 6-24238, “Electronic Blackboard with Screen” (Fuji Xerox Co., Ltd.), a screen device composed of a sheet that is rolled up and down is arranged on the top of a plate-like white plate device supported by legs. A configuration is disclosed. Japanese Patent Laid-Open No. 2002-11998 “Electronic Blackboard Device” (Matsushita Electric Industrial Co., Ltd.) also discloses a similar configuration.
[0003]
Japanese Patent Laid-Open No. 2002-144786 “Electronic Blackboard Device” (Matsushita Electric Industrial Co., Ltd.) discloses a setting position of an electronic blackboard having a plurality of setting surface setting positions on a belt-like film that is stretched and rotated endlessly. A technique has been disclosed in which one of the OHP screens is used and the belt-like film is rotationally driven to change the writing surface when OHP is used.
Japanese Patent Application Laid-Open No. 11-38902 “Presentation Device” (Ricoh Elemex Co., Ltd.) discloses a projection screen plate for projecting the projection content projected from the back side by a liquid crystal projector to the front side, and a transparent provided so that the projection content can be seen visually. And a white part when used as an electronic blackboard, and these are appropriately selected and stretched to the front side of the projection screen, and provided with a movable writing sheet that can be written using a writing instrument. A technique is disclosed that makes it possible to read the content that has been included and display it on a display member.
[Patent Document 1]
Japanese Utility Model Publication No. 5-44586
[Patent Document 2]
Japanese Utility Model Publication No. 7-5789
[Patent Document 3]
Japanese Patent Laid-Open No. 4-110839
[Patent Document 4]
No. 6-24238
[Patent Document 5]
JP 2002-11998 A
[Patent Document 6]
JP 2002-144786 A
[Patent Document 7]
JP 11-38902 A
[Patent Document 8]
Utility Model Registration No. 3006814
[Patent Document 9]
JP 2002-19385 A
[0004]
[Problems to be solved by the invention]
Each of the prior arts described in Patent Documents 1 to 7 has a separate function in order to realize a writing function such as a whiteboard (blackboard), a screen function, and an electronic blackboard function with one device configuration. A movable configuration realized by a member (board, sheet, etc.) and operating at least one of the members is adopted. Alternatively, one sheet-like member is configured to be endless or rollable so as to have the plurality of functions together.
However, when a plurality of functions as described above are to be realized by a single device configuration, the number of parts resulting from the need to add a movable mechanism is increased, and the configuration is complicated and enlarged by combining a plurality of functional members. This causes inconveniences such as an increase in apparatus cost, an increase in power consumption, and a reduction in individual functions due to the forced downsizing. Moreover, it takes time to switch between the functions. Further, since the screen state remains constant, for example, when the whiteboard is used and when the screen is used, it is necessary to repeatedly turn on and off the indoor lighting in order to control the visibility, and the operation is complicated. Also, there has not been proposed a configuration having a configuration for realizing screen color density adjustment with a non-movable structure.
Further, for example, Utility Model Registration No. 3006814 and Japanese Patent Application Laid-Open No. 2002-19385 disclose a configuration in which a writing surface such as a whiteboard and a screen are arranged on the front and back of a single board, and is suitable for use on a whiteboard. Although technology has been shown that the screen can be used even in bright places without dimming the illumination, the fact that the visibility of the image projected on the screen varies in accordance with the difference in the illuminance in the room actually These conventional techniques, which are common sense and cannot change the state of the screen in spite of a change in the brightness level of the room, can provide only a device having a low product value. In addition to the above, there is a type in which the writing surface and the screen surface coexist on the same surface of one board, but not only has the same drawbacks, but also prevents the reflection of light and the projected image on the screen. Since it is necessary to roughen the screen surface in order to make it easy to see, there is a drawback that it is not possible to completely erase the contents written on the same surface with a marker pen or the like.
[0005]
The present invention has been made in view of the above, and at least two of functions such as a writing function of a whiteboard, a screen function of projecting an image from a projector, and an electronic whiteboard (electronic blackboard) function are movable. Increase the number of parts by providing parts, increase the complexity and size of the configuration, increase the cost, increase power consumption, increase the time and man-hours required to switch between each function, reduce the individual functions due to excessive miniaturization, etc. It is an object of the present invention to provide a dimming screen device including a writing unit that can realize various functions by one device configuration without incurring.
In addition, the present invention can switch between functions without requiring time by performing a simple switch operation while the screen remains in a fixed state where the screen does not operate mechanically. The present invention provides a technique that eliminates the need for complicated incidental operations such as turning off or adjusting indoor lighting in order to control the visibility of the screen, and makes it easy to see by adjusting the color density of the screen. In addition, the projector projection image contrast is improved even under the fluorescent lamp in the room without darkening the room lighting when using the projector, and the contrast of written characters and figures is improved and written even when using the whiteboard. This makes it possible to record characters and the like.
[0006]
[Means for Solving the Problems]
  In order to solve the above-mentioned problems, the invention of claim 1 is directed to a writing surface, a dimming means that is arranged in close contact with the back surface of the writing surface and can change transparency, and a control means that controls the dimming means. Photographing means for photographing the writing surface from the back of the writing surface;Operating means for operating the control means from the outside;The control means controls the dimming means to be transparent according to the photographing by the photographing means.In addition, the whiteboard mode, the screen mode, or the projector mode is switched according to the operation of the operation means, and the adjustment is performed so that the screen looks blacker than the whiteboard mode when viewed from the writing surface side in the screen mode or the projector mode. Control light meansIt is characterized by that.
  According to a second aspect of the present invention, in the first aspect of the present invention, a projection unit that projects the projection surface from the back surface of the writing surface is provided.
  According to a third aspect of the present invention, in the light control screen device according to the second aspect, the light control screen device includes a light shielding unit that blocks the projection light from the projection unit, and the imaging unit receives a photographing instruction during projection by the projection unit. The control means controls the projection light of the projection means to be blocked by a light shielding means..
ContractClaim4The invention of claim 1 to claim 13In any one of the above, the said light control means changes the transparency of the said light control means by the change of the applied voltage.
[0007]
  Claim5The invention of claim4The dimming means includes two transparent substrates on which a transparent electrode and an electrochromic material are formed, and an electrolytic solution sealed between the two transparent substrates.
  Claim6The invention of claim4The dimming means includes two transparent conductive substrates, 0.05 to 50% by weight of a transparent polymer solid and a liquid crystal component of 1 to 50% by weight disposed between the two transparent conductive substrates. And a chiral nematic liquid crystal containing 5% by weight of a chiral dopant, wherein the chiral dopant is a mixture of a cholesteric liquid crystal and a ferroelectric liquid crystal exhibiting a chiral smectic C phase.
  Claim7The invention of claim 1 to claim 16The output means for outputting the image information image | photographed by the said imaging | photography means in any one of these is characterized by the above-mentioned.
[0008]
  Claim8The invention of claim 1 to claim 17In any one of the above, it is characterized by comprising connection means for connecting to a computer via a network.
  Claim9The invention of claim 1 to claim 18In any one of the above, a computer for processing the image information photographed by the photographing means is provided.
  Claim10The invention of claim 1 to claim 19In any one of the above, the size of the screen body composed of the writing surface and the light control means is at least 40 cm in length and 120 cm in length.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.
1A and 1B are cross-sectional views showing a schematic configuration of a light control screen device including a writing unit according to the first embodiment of the present invention.
A dimming screen device (hereinafter referred to as a screen device) 1 having this writing unit is a transparent plate having a writing surface (whiteboard) 2a on the surface capable of writing characters and the like with a writing instrument and erasing the characters. A dimming unit 11, a dimming unit 11 that is arranged in close contact with the back surface of the writing unit 2, can change the reflectance and transmittance of light, and does not include a mechanical movable unit, and a dimming unit 11 is provided with a reflective or transmissive white screen 21 arranged in close contact with the rear surface side of the substrate 11 with a transparent plate 3 interposed therebetween.
The light control means 11 has a structure capable of changing the reflectance and transmittance of light by changing the applied voltage, specifically, a structure using the electrochromic material shown in FIG. Alternatively, the configuration using the polymer dispersed liquid crystal shown in FIG. 2 is adopted.
[0010]
First, FIGS. 1A and 1B show a light control screen device 1 provided with light control means 11 using an electrochromic material. The light control means 11 has two transparent substrates (transparent) in which a transparent electrode and an electrochromic material are formed (laminated) on a transparent film as a configuration for changing the reflectance and transmittance of light by changing the applied voltage. Conductive substrates) 12a and 12b, an electrolytic solution 13 sealed in a space formed between the transparent substrates 12a and 12b, and a power source 15 for supplying a voltage to the transparent electrodes on the substrates. The transparent substrates 12 a and 12 b and the electrolytic solution 13 constitute an electrochromic layer (EC layer) 14.
The electrochromic material is made of, for example, tungsten oxide, and is a material that exhibits a reversible color change (coloring and decoloring) by applying a voltage as is well known, and can maintain a state even when the applied electric field disappears. Specifically, by applying a voltage between the electrodes, ions and electrons can be inserted into and released from the electrochromic material, and the valence of the transition metal constituting the material can be reduced. By changing, the light in the visible light region is absorbed to become colored or transparent.
The EC layer 14 is colored (colored) by applying a voltage from the power source 15 to the transparent electrodes on the transparent substrates 12a and 12b, and becomes colorless and transparent by reverse application. When used as a white board, the color of the white screen 21 on the back surface is transmitted to the writing surface 2a on the front side by making the EC layer 14 transparent as shown in FIG. Can be used as a whiteboard. When projecting an image with a projector or the like, as shown in FIG. 1B, a voltage is applied to the EC layer 14 so that the EC layer 14 is colored gray so that the projected image is viewed from the writing surface 2a without reducing the contrast. It can be used as a screen with good visibility.
In this way, according to the state of use, the color, brightness, darkness, shade, etc. of the screen device when viewed from the front side are instantaneously changed, so that an image with high contrast and high visibility (written image, Projection image) can be obtained. In addition, since there is no movable mechanism, it is possible to realize simplification and speedup of operation, reduction of the number of parts, simplification of mechanism, weight reduction, compact configuration, reduction of occupied area, cost reduction, and energy saving.
In addition, by using an electrochromic material as the light control means 11, it is possible to change the state of color, brightness, darkness, etc. depending on voltage, shorten the switching time, and provide a screen device having energy saving characteristics. It becomes.
[0011]
Next, FIGS. 2A and 2B are schematic cross-sectional views illustrating the configuration and operation of the screen device according to the second embodiment of the present invention. The writing unit 2 is formed of a transparent plate having a writing surface (whiteboard) 2a capable of writing and erasing the characters and the like, and is arranged in close contact with the back surface of the writing unit 2 to reflect or transmit light. The dimming means 11 capable of changing the rate and having no mechanical movable part, and the reflection type or transmission type gray arranged in close contact with the back side of the dimming means 11 via the transparent plate 3 And a screen 31.
The light control means 11 capable of changing the reflectance and transmittance of light by applying a voltage is disposed between two transparent substrates (transparent conductive substrates) 32a and 32b functioning as transparent electrodes, and the transparent substrate. A polymer dispersed liquid crystal 33, and a power source 35a and a switch 35b for applying a voltage between the transparent substrates 32a and 32b are provided. The transparent substrates 32 a and 32 b and the polymer dispersed liquid crystal 33 constitute a PDLC layer 37.
The polymer dispersed (PDLC) type liquid crystal 33 is a liquid crystal material particle dispersed in a liquid crystal, and generates light scattering due to a difference in refractive index between the liquid crystal and the polymer material. It becomes transparent when the refractive index of the liquid crystal and the polymer material becomes equal. A light absorption layer is provided on the back surface, and white display is performed by backscattered light at the time of scattering, and transmitted light is absorbed by the absorption layer at the time of transparency to realize black display.
The polymer dispersed liquid crystal 33 used in the present embodiment is a mixture of 1 to 50% by weight of a transparent polymer solid and a chiral nematic liquid crystal containing 0.05 to 5% by weight of a chiral dopant of a liquid crystal component. Further, the chiral dopant is a mixture of a cholesteric liquid crystal and a ferroelectric liquid crystal exhibiting a chiral smectic C phase.
The polymer-dispersed liquid crystal as shown in FIG. 2 (a) is white and reflects external light when no voltage is applied, so that it can be used as a white board, and the voltage is applied as shown in FIG. 2 (b). When applied, it becomes transparent and the color of the gray screen 31 on the back surface is transmitted, so that it can be used as a screen with good visibility without degrading the contrast of the projected image of an image projection device such as a projector.
When polymer dispersed liquid crystal is used for the screen device main body, it is possible to obtain a screen device that can be driven at a low voltage and can have a large area with optical contrast and high-speed response.
[0012]
FIG. 3 shows the difference in display pattern between the electrochromic screen device of FIG. 1 and the polymer dispersed liquid crystal screen device of FIG. That is, in the electrochromic screen device, white is visually recognized from the writing surface 2a when the EC layer 14 is uncolored and the whiteboard mode is set, while the EC layer 14 is gray when the EC layer 14 is colored (others). ) Is visually recognized, and the projector mode (screen mode) is set. Further, in the polymer dispersion type liquid crystal type screen device, when the liquid crystal is white, white is visually recognized from the writing surface 2a, and the whiteboard mode is set. On the other hand, when the liquid crystal is transparent, the writing surface 2a is gray (other colors). Is recognized and the projector mode is set.
[0013]
Next, embodiments common to the types of screen devices shown in FIGS. 1 and 2 will be described.
First, FIG. 4 is an explanatory view of a third embodiment of the present invention, (a) is a front view in whiteboard mode, (b) is a sectional view of the screen device body, (c) is a block diagram, d) is a front view in the projector mode (screen mode).
The light control screen device 1 according to this embodiment has a configuration in which operation means and control means are added to the screen device shown in FIG. 1 or 2.
That is, the dimming screen device 1 includes a writing unit 2 provided with a writing surface 2a on the surface capable of writing characters and the like with a writing tool and erasing the characters, and the rear surface of the writing unit 2 to reflect light. The dimming means 11 that can change the rate and the transmissivity and has no movable part, the reflective or transmissive screen 21 (or 31) arranged on the back side of the dimming means 11, and externally operable Operating means (operation SW group) 41, control means 42 for changing the light reflectance and transmittance of the EC material layer 14 or the PDLC layer 37 by the light adjusting means 11 according to the operation of the operating means 41, and a screen A leg 43 is provided to support the apparatus main body.
The light control screen device 1 includes a screen device main body including a writing surface 2, a light control means 11, and a reflective screen 21 or 31, and the screen device main body is incorporated in an apparatus having an operation means 41 such as a mode switch. ing. As shown in the block diagram of FIG. 4C, the mode switch 41 is connected to the dimming means 11 via the control means 42, and the control means 42 is connected to the dimming means 11 depending on the operation state of the mode switch 41. By controlling the voltage application state, the light reflectance and transmittance of the light control means 11 are changed.
If the light control means 11 includes the electrochromic layer 14 shown in FIG. 1, when the whiteboard mode switch is pressed, a voltage is applied in the direction in which the electrochromic layer 14 becomes transparent, and the screen mode When the switch is pressed, a reverse voltage is applied to shift the display surface to a gray state.
[0014]
Further, if the light control means 11 is a system provided with the polymer dispersed liquid crystal (PDLC layer 37) shown in FIG. 2, when the whiteboard mode switch is pressed, no voltage is applied and the display surface ( When the screen mode switch is pressed, a voltage is applied to make the display surface transparent. When in whiteboard mode, it can be used as a normal whiteboard ((a)), and when in screen mode, it becomes a highly visible screen for projecting an image of an image projection device 45 such as a projector ((b)), and further projected. It becomes possible to write and erase graphics and characters with markers on the image. The screen mode includes a case where an image is projected by an image projection device other than the projector, in addition to the image projection by the projector.
The control unit 42 switches the state of the light control unit 11 to the whiteboard mode, the screen mode, or the projector mode according to the operation state of the operation unit 41, and viewed the screen from the writing surface side in the screen mode or the projector mode. The light control means 11 is controlled so that it sometimes looks blacker than in the whiteboard mode.
As described above, in the screen device according to the present embodiment, the contrast, even in a bright environment, is excellent by instantaneously changing the color, brightness, shading, etc. of the screen device according to the usage state of the screen device by the selection operation of the operator. A highly visible image can be obtained. Moreover, since there is no movable mechanism, it is possible to simplify and speed up the operation, reduce the number of parts, simplify the mechanism, reduce the weight, reduce the configuration, reduce the occupied area, reduce the cost, and save energy.
[0015]
5A, 5B, 5C, and 5D are a front view, a cross-sectional view, a block diagram, and a screen showing the configuration of the screen device according to the fourth embodiment of the present invention in the whiteboard mode. It is a front view which shows the mode time.
The dimming screen device 1 has an operation means 41 such as a mode switch and a dimming means 11 according to the operation of the operation means 41 with respect to any type of screen device body shown in FIG. A control means 42 for controlling the reflectance and transmittance of light, a recording means 51 for recording characters by a writing instrument such as a marker, and an output means 52 such as a printer for outputting recorded information recorded in the recording means 51. It has an added configuration.
The recording means 51 includes a movable transparent sheet 57 stretched endlessly by a large roller 52, a small roller 53, and a drive roller 54, and the drive roller 54 is driven by a motor 56 via a gear 55. The movement of the movable transparent sheet 57 can be controlled by controlling the motor 56. A portion of the movable transparent sheet 57 stretched between the large roller 52 and the driving roller 54 is attached to the front surface of the writing surface 2a so as to be slidable. In both the board mode and the screen mode (d), the transparent sheet 57 on the front surface of the screen device can be written with a marker or the like. This write information is sent by the operator to the feed SW shown in FIG. / When the print SW 60 is pressed, the motor 56 rotates and the movable transparent sheet moves. At this time, the movement amount of the movable transparent sheet 57 is grasped by the position detection means 61. When the movable transparent sheet 57 moves, the information written therein is captured as image data by the scanner 62 including a reading element such as a CCD when passing through the scanner 62, and the captured information is stored in the screen device main body. It is output from the printer 52 as the connected output means. Note that the recording means 51 in the present embodiment includes a movable transparent sheet 57, its drive mechanism, and a scanner 62.
The image information captured by the scanner 62 can be output to an external device (such as a PC) connected to the network via the I / O.
As described above, in the screen device according to the present embodiment, in addition to the effects common to the above-described embodiments, the characters written on the writing surface are recorded and incorporated regardless of the use mode of the screen. Output to a printer or external device.
[0016]
Next, FIGS. 6 (a), (b), (c), (d), and (e) are longitudinal sectional views, block diagrams, and states of respective modes showing the configuration of a screen device according to another embodiment of the present invention. FIG.
The light control screen device 1 includes a writing unit 2 made of a transparent sheet, a light control means 11, a transmission screen 21, or 31 (hereinafter referred to as a screen device main body) and a transmission screen. A transparent reinforcing plate 72 joined to the back surface of the transparent reinforcing plate 72 and a reflecting mirror 73 fixed to an inclined wall surface facing the transparent reinforcing plate 72 are provided. Further, inside the casing 71, a digital camera 75 as recording means, a projector 45 for projecting electronic information, a light shielding plate 76 for shielding projection light from the projector 45, and a stepping for driving the light shielding plate 76 are provided. A motor 77 is provided. In the projector mode (screen mode), the projection light emitted from the projector 45 is reflected by the reflection mirror 73 and projected onto the screen device main body, and can be viewed from the front of the writing unit 2. In the whiteboard mode and the electronic whiteboard mode, the information written on the writing surface 2 a is photographed by the digital camera 75 while the photographing optical path is changed by the reflecting mirror 73.
In the whiteboard mode, as shown in FIG. 6C, the screen device main body (the light control means 11) turns white by pressing the whiteboard mode switch constituting the operation means (operation SW group (41)). Thus, writing is possible.
In the recording mode in which the information written with the marker on the writing surface 2a is recorded, the screen device body becomes transparent by pressing the recording switch constituting the operation means 41, and the writing information is photographed by the digital camera 75 so as to have a predetermined format. Saved by.
[0017]
In the projector mode, as shown in FIG. 6D, when projecting by the projector 45, when the projector switch is pressed, the screen body is colored and a high-contrast image is projected and written on the writing surface 2a. When photographing information, the screen device main body is made transparent, the projection light of the projector 45 is shielded by the light shielding plate 76, photographed by the digital camera 75, and predetermined processing is performed by the image processing means 78 shown in FIG. 6 (h). I do.
As shown in FIG. 6 (e), in this apparatus, when recording characters or the like, the light control means 11 (screen main body) is set in a transparent state in both the projector mode and the electronic white board mode. Then, the image is taken with the built-in digital camera 75. In the projector mode, as described above, the light of the projector 45 is shielded by the light shielding plate 76 and photographed.
By providing the dimming screen device 1 with an I / O 63 that is a means for connecting to a network, information stored by photographing can be moved to an arbitrary external computer via the network and processed later.
Further, if the dimming screen device 1 has a function of a personal computer (PC) in advance, a series of controlled objects are controlled by the PC, and the recorded image information is processed to obtain an arbitrary form. Thus, the image can be displayed again on the display unit 2 through the projector.
Further, the screen body composed of the writing unit 2, the light control means 11, and the screens 21 and 31 is a screen having a vertical length of 40 cm or more and 120 cm or less. Such a screen device is supposed to be used by a plurality of people in a conference and the like, and in consideration of the situation of the conference, a certain size is necessary. It is difficult to see. Considering this, it is desirable that the screen has a vertical length of 40 cm or more and 120 cm or less.
[0018]
【The invention's effect】
  As described above, according to the present invention, at least two of the functions such as the writing function of the whiteboard, the screen function of projecting the image from the projector, and the electronic white board (electronic blackboard) function are provided., DisappearThis can be realized by a single device configuration without incurring an increase in power consumption, an increase in time and man-hours required for switching between functions, and a reduction in individual functions due to excessive miniaturization.
  AlsoDepending on the usage condition of the screen device, the color of the screen display surface, light and dark, light and shade etc.The momentBecause it can be changed from time to time, it is possible to improve the operability and reliability, and to make a whiteboard or screen with good contrast even in a bright room..
  AlsoThe color of the display surface of the screen device according to the use state of the screen device by the user's selection operationThe momentSince it can be changed from time to time, high reliability is achieved, visibility with good contrast can be obtained even in a bright room, and an easy-to-use whiteboard or screen can be obtained.
  AlsoIn the screen mode, the display surface of the screen appears blacker than in the whiteboard mode, so that a screen with good contrast can be obtained even when using a projector in a bright room.
  AlsoIn the screen deviceTransparencySince this change is performed by the voltage control method, it can be controlled with energy saving.
[0019]
  AlsoOf screen deviceTransparencyBy using an electrochromic material as means for changing the above, it is possible to obtain a dimming screen device that can be changed by voltage, has a short switching time, and saves energy.
  AlsoOf screen deviceTransparencyBy using a chiral nematic liquid crystal containing a chiral dopant for the light control layer, a light control screen device capable of being driven at a low voltage, having an optical contrast and a high speed response and capable of increasing the area can be obtained. it can.
  AlsoRegardless of the state of use of the screen device, characters and figures written on the surface with markers etc.Photographed by photographing meansOutput to a built-in printer or external device.
  Also, with a PC via the networkSince the connection means is provided, information written with a marker or the like can be recorded on the display surface of the screen device, and this recorded information can be sent to any PC on the network.
  AlsoSince the apparatus has a PC, it is possible to perform operations such as storing the recorded writing information by the marker on the screen apparatus in the apparatus and processing the information as necessary.
  AlsoSince the screen size is large, the visibility of the conference participants is good, and the conference can be activated.
[Brief description of the drawings]
FIGS. 1A and 1B are cross-sectional views illustrating a schematic configuration of a light control screen device including a writing unit according to a first embodiment of the present invention.
2A and 2B are schematic cross-sectional views showing the configuration and operation of a screen device according to a second embodiment of the present invention.
3 is a diagram for explaining a difference in display pattern between the electrochromic screen device of FIG. 1 and the polymer dispersed liquid crystal screen device of FIG. 2;
4A and 4B are explanatory diagrams of a third embodiment of the present invention, in which FIG. 4A is a front view in a whiteboard mode, FIG. 4B is a cross-sectional view of a screen device main body, FIG. ) Is a front view in the projector mode.
FIGS. 5A, 5B, 5C, and 5D are a front view, a cross-sectional view, a block diagram, and a diagram showing a configuration in a whiteboard mode of a screen device according to a fourth embodiment of the present invention; And a front view showing the screen mode.
6 (a), (b), (c), (d), and (e) are longitudinal sectional views, block diagrams, and states of modes of a screen device according to another embodiment of the present invention. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Light control screen apparatus, 2 Writing part, 2a Writing surface (display surface), 3 Transparent board, 11 Light control means, 12a, 12b Transparent substrate, 13 Electrolyte, 14 Electrochromic layer (EC layer), 15 Power supply, 31 Screen, 32a, 32b Transparent substrate (transparent conductive substrate), 33 polymer dispersed liquid crystal, 35a power supply, 35b switch, 37 PDLC layer, 41 mode switch, 42 control means, 51 recording means, 56 motor, 57 movable transparent Sheet, 62 Scanner, 71 Case, 72 Transparent reinforcing plate, 73 Reflecting mirror, 75 Digital camera (recording means), 76 Light shielding plate, 77 Stepping motor, 78 Image processing means.

Claims (10)

A writing surface, a light control means arranged in close contact with the back surface of the writing surface and capable of changing transparency, a control means for controlling the light control means, and a photographing for photographing the writing surface from the back surface of the writing surface Means, and operating means for operating the control means from the outside ,
The control unit controls the dimming unit to be transparent according to shooting by the shooting unit, and switches to a whiteboard mode, a screen mode, or a projector mode according to an operation of the operation unit, and a screen mode or projector A dimming screen device that controls the dimming means so that when viewed from the writing surface side in the mode, the dimming unit looks blacker than in the whiteboard mode .   2. The dimming screen device according to claim 1, further comprising projection means for projecting from the back surface of the writing surface onto the writing surface.   A light-blocking unit that blocks the projection light of the projection unit; and the control unit controls the projection light from the projection unit to be blocked by the light-blocking unit when the photographing unit receives a photographing instruction during projection by the projection unit. The dimming screen device according to claim 2, wherein It said light control means is dimmer screen device according to any one of claims 1 to 3, characterized in that changing the transparency of the light control means by a change of the applied voltage. It said light control means is claim, characterized in that it comprises two transparent substrates to form a transparent electrode and the electrochromic material, and a electrolytic solution which is sealed between said two transparent substrates 4 The light control screen apparatus as described in 1. The light control means includes two transparent conductive substrates, 0.05 to 5% by weight of a transparent polymer solid of 1 to 50% by weight and a liquid crystal component disposed between the two transparent conductive substrates. And a mixture with a chiral nematic liquid crystal containing 1% chiral dopant,
5. The light control screen device according to claim 4 , wherein the chiral dopant is a mixture of a cholesteric liquid crystal and a ferroelectric liquid crystal exhibiting a chiral smectic C phase. Dimmer screen device according to any one of claims 1 to 6, characterized in that an output means for outputting the image information captured by the imaging means. Dimmer screen device according to any one of claims 1 to 7, further comprising a connecting means for connecting the computer via a network. Dimmer screen device according to any one of claims 1 to 8, characterized in that with a computer for processing the image information captured by the imaging means. Said writing surface, the size of the screen body consisting of the light control means is at least vertically 40cm above, with a writing unit according to any one of claims 1 to 9, characterized in that a 120cm less Dimmable screen device.

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