Patent Publication Number: US-2021163152-A1

Title: Information display device

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority to U.S. Provisional Patent Application No. 62/941,736 filed Nov. 28, 2019, the entire contents of which are incorporated herein by reference. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to an information display device including a display panel. 
     BACKGROUND 
     As an information display device including a display panel and a surface member, there is known an information display device that displays contents displayed on the display panel through the surface member (refer to Japanese Patent Unexamined Publication No. 2012-118513). 
     SUMMARY 
     It is possible to improve the designability of a space by covering the display panel with a surface member and displaying only the information to be displayed via the surface member on the wall without making the user feel the presence of the display panel. However, in order to make the display panel invisible through the surface member, it is necessary to suppress external light transmitted through the surface member, and when the light transmitted through the surface member from the display panel attenuates, there is a concern that it is difficult to see the information displayed on the display panel. 
     An information display device according to the disclosure aims to allow a user to see information from a display panel displayed on a surface member without being aware of the presence of the display panel. 
     An information display device according to the disclosure is an information display device attachable to a structure, and comprises a display panel including a display surface and a surface member. The display panel is configured to display information on the display surface. The surface member is disposed on a side of the display surface of the display panel, through which only the information displayed on the display surface of the display panel becomes visible when the display panel is turned on. The surface member includes a first layer and a second layer. The first layer is disposed on a front side, and the second layer is disposed between the first layer and the display panel. The second layer is configured to adjust light transmittance of the surface member. The second layer is configured to compensate difference of transmittance depending on a position on the first layer. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  illustrates a usage environment of an information display device according to Embodiment 1. 
         FIG. 2  illustrates a schematic configuration of a display device according to Embodiment 1. 
         FIG. 3  is a schematic sectional view of the information display device according to Embodiment 1. 
         FIG. 4  illustrates a usage environment of an information display device according to a modification example of Embodiment 1. 
         FIG. 5  is a configuration view of a system for operating the information display device according to the modification example. 
         FIG. 6  illustrates a usage environment of an information display device according to another modification example of Embodiment 1. 
         FIG. 7  is a configuration view of a system for operating the information display device according to the modification example. 
         FIG. 8  is a schematic sectional view of the information display device according to the modification example. 
         FIG. 9  illustrates a usage environment of an information display device according to another modification example of Embodiment  1 . 
         FIG. 10  is a configuration view of a system for operating the information display device according to the modification example. 
         FIG. 11  is a schematic sectional view of the information display device according to the modification example. 
         FIG. 12  illustrates a usage environment of an information display device according to another modification example of Embodiment 1. 
         FIG. 13  is a configuration view of a system for operating the information display device according to the modification example. 
         FIG. 14  is a schematic sectional view of the information display device according to the modification example. 
         FIG. 15  illustrates a usage environment of an information display device according to another modification example of Embodiment 1. 
         FIG. 16  is a configuration view of a system for operating the information display device according to the modification example. 
         FIG. 17  is a schematic sectional view of an information display device according to Embodiment 2. 
         FIG. 18  is a schematic sectional view of an information display device according to Embodiment 3. 
         FIG. 19  is a schematic sectional view of an information display device according to Embodiment 4. 
         FIG. 20  illustrates an information display device according to a modification example of Embodiment 4. 
         FIG. 21  is a schematic sectional view of an information display device according to another modification example of Embodiment 4. 
         FIG. 22  is a schematic sectional view of an information display device according to Embodiment 5. 
         FIG. 23  is a schematic sectional view of an information display device according to a modification example of Embodiment 5. 
         FIG. 24  is a schematic sectional view of an information display device according to Embodiment 6. 
         FIG. 25  is an exploded sectional view of the information display device according to Embodiment 6. 
         FIG. 26  is a schematic sectional view of an information display device according to a modification example of Embodiment 6. 
         FIG. 27  is a schematic sectional view of an information display device according to another modification example of Embodiment 6. 
         FIG. 28  is a schematic sectional view of an information display device according to another modification example of Embodiment 6. 
         FIG. 29  is a schematic sectional view of an information display device according to Embodiment 7. 
         FIG. 30  is a schematic sectional view of an information display device according to a modification example of Embodiment 7. 
         FIG. 31  illustrates a usage environment of an information display device according to Embodiment 8. 
         FIG. 32  is a configuration view of a system for operating the information display device according to Embodiment 8. 
         FIG. 33  is a schematic sectional view of the information display device according to Embodiment 8. 
         FIG. 34  illustrates a usage environment of an information display device according to Embodiment 9. 
         FIG. 35  is a configuration view of a system for operating the information display device according to Embodiment 9. 
         FIG. 36  is a schematic sectional view of the information display device according to Embodiment 9. 
         FIG. 37  illustrates a usage environment of an information display device according to Embodiment 10. 
         FIG. 38  illustrates an appearance of the information display device according to Embodiment 10. 
         FIG. 39  is an exploded sectional view of the information display device according to Embodiment 10. 
         FIG. 40  is a schematic sectional view of the information display device according to Embodiment 10. 
         FIG. 41  is a perspective view of a structure before an information display device according to a modification example of Embodiment 10 is attached. 
         FIG. 42  is a perspective view of a structure in the middle of attaching the information display device according to the modification example. 
         FIG. 43  is a perspective view of a structure in a state where the information display device according to the modification example is attached. 
         FIG. 44  illustrates a usage environment of the information display device according to another embodiment. 
         FIG. 45  is a schematic sectional view of the information display device of  FIG. 44 . 
         FIG. 46  illustrates a usage environment of an information display device according to another modified example of Embodiment 1. 
         FIG. 47  is a schematic sectional view of an information display device according to a comparison example, in relation to an example of Embodiment 7. 
         FIG. 48  is a schematic sectional view of an information display device according to the example of Embodiment 7. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, there is a case where an unnecessary detailed description is omitted. For example, there is a case where the detailed description of a well-known item or a redundant description of substantially the same configuration is omitted. 
     In addition, the attached drawings and the following description are provided in order to enable those skilled in the art to fully understand the disclosure, and are not intended to limit the subject matter described in the claims. 
     In the following description, a “front surface side” or a “front side” of an information display device is a side on which ambient light or external light is incident or a side closer to a user who sees the information display device, unless otherwise specified. A “back surface side” or a “back side” is a side opposite to the “front surface side” or the “front side”, and is a side where light of a display panel is emitted or guided. 
     In the information display device according to the disclosure, a surface member that covers the entirety or a part of a wall surface having a designability and light transmitting properties is disposed on a front surface of the display panel. The information display device according to the disclosure can realize a seamless design having no seam between a wall surface and an information display region, and can also realize an information display device having operability. 
     In the following description, a case where the information display device is used in an aircraft is employed as an example. 
     1. Embodiment 1 
       FIG. 1  illustrates a usage environment of information display device  1  according to the embodiment. 
     In the usage environment in the embodiment, information display device  1  is disposed on wall surface  10  which is a part of the interior of the aircraft. Information display device  1  transmits light of the display panel from the back side of surface member  11  and displays information (content information, character information, image, video, and the like) in display region  1   a  on surface member  11 . User  13  can operate an operation screen displayed in display region  1   a  of surface member  11  to display and change information and make a request to a crew. 
     1-1. Configuration 
     Hereinafter, an outline of the configuration and operation of information display device  1  of the embodiment will be described with reference to  FIGS. 2 and 3 . Information display device  1  of the embodiment includes display device  20  installed behind surface member  11 . Information such as contents or characters displayed on the display surface of display device  20  is displayed on the surface of surface member  11  through surface member  11  and presented to user  13 . 
       FIG. 2  illustrates a schematic configuration of display device  20  of the embodiment. Display device  20  includes touch panel  21 , CPU  22 , and display panel  23 . Touch panel  21  detects an input of user  13  via surface member  11  based on a change in electrostatic capacitance, pressure, or light, processes the input in CPU  22 , and controls display device  20 . 
     Touch panel  21  may be a touch sensor. The touch panel or the touch sensor is not essential as a configuration element of display device  20 . In a case where there is no touch panel or a touch sensor, display device  20  cannot directly receive the operation from the user, but can display a logo or a symbol on wall surface  10  or use as lighting or the like hidden on wall surface  10 . 
       FIG. 3  is a schematic sectional view of information display device  1  of the embodiment. Information display device  1  includes surface member  11 , reflection member (half mirror)  12 , touch panel  21 , and display panel  23 . 
     Surface member  11  is a member disposed on the surface of the wall in the aircraft cabin, and is a surface member that covers a part or the entirety of a wall, a floor, an armrest, and a table of a seat shell. The range in which the information is displayed through surface member  11  is a range that is reached by the hand when the user is in operation, a range (including, for example, a bedside) reached by the line of sight from a passenger in order to deliver the information to the passenger, and further, a range reached by the line of sight from the crew (cabin attendant). 
     Surface member  11  is a material having a certain level of translucent properties, and has a plate or film shape. A surface area of surface member  11  is configured to be larger than the display area of display panel  23 . The material of surface member  11  is a material having the same or similar surface to that of the material that covers the surface of wall surface  10 . By embedding display panel  23  in wall surface  10  and covering the display panel with surface member  11 , information can be displayed on wall surface  10  without making user  13  aware of the presence of display panel  23 . Further, by making the surface area of surface member  11  larger than the display area of display panel  23 , display region  1   a  of display panel  23 , that is, the border or outer edge of the display area of display panel  23  becomes difficult to be visually recognized from the user. In addition, by covering the entire wall surface  10  with surface member  11 , it is possible to completely eliminate the seam around display panel  23 . 
     Accordingly, user  13  can be made unaware of the presence of display panel  23 . Surface member  11  is made of a genuine material such as wood, cloth, leather, stone, or the like, a film material simulating the genuine material, or a transparent or translucent material of which a surface is decorated by painting or printing, and accordingly, it is possible to display information without making the user feel the presence of display panel  23  from the appearance. 
     Surface member  11  may be configured to partially have light transmitting properties, not to transmit light to other area, and to display only necessary areas. For example, by providing a part having light transmitting properties in a specific symbol shape, a clearer symbol can be displayed. The light transmittance of surface member  11  is, for example, 8% to 15%. Since surface member  11  is configured to have such a light transmittance, the light transmitted from the front side to the back side of surface member  11  is suppressed such that display panel  23  itself becomes invisible from the outside, and it is possible to make the display by display device  20  sufficiently visually recognizable even through surface member  11 . 
     Surface member  11  may have a certain hard coating (not illustrated) on the side opposite to the side (back side) where display panel  23  is present, that is, on the front side. The user frequently touches the front side of surface member  11  for operation using touch panel  21 . In particular, in a case where information display device  1  is used in equipment and the like in the aircraft, an unspecified number of people perform a touch operation. Accordingly, it is preferable that the hard coating has a hardness of, for example, 2H (JIS standard) or higher. Thereby, damage can be prevented. The hard coating may be a thin layer to keep the feeling of surface member  11 . The hard coating has a thickness of, for example, 5 to 20 μm. 
     Reflection member  12  is a material such as a half mirror, and has a characteristic of reflecting external light but transmitting light from display panel  23  on the inside. By inserting reflection member  12  between surface member  11  and display panel  23 , the boundary between wall surface  10  and the display region can be made more difficult to be seen. While the presence of display panel  23  itself is prevented from being seen through surface member  11  by the external light reflection characteristic of reflection member  12 , the display contents of display panel  23  can be presented to the user by the characteristic of transmitting the light of reflection member  12 . 
     In addition, when surface member  11  has a sufficient external light reflection characteristic and a light transmission characteristic of the internal light source emitted from display panel  23 , reflection member  12  may be omitted. 
     Surface member  11  and reflection member  12  may be formed of an insulator such that touch panel  21  can be operable. In this case, the sheet resistance is preferably higher. This is because, when there is no sufficient resistance value, false recognition or the like of a touch detection position on touch panel  21  is induced. In order to sufficiently ensure the performance of touch panel  21 , it is preferable that surface member  11  and reflection member  12  have a sheet resistance value of, for example, 30 megaohms or more. 
     Reflection member  12  may be formed by a metal vapor-deposited film that can transmit electromagnetic waves or a film that can produce a metallic luster by laminating a resin material. In this case, an indium-deposited film, a film formed by laminating a PET material, or the like is preferable. Accordingly, it becomes easy to ensure both the performance of touch panel  21  and to hide display panel  23 . 
     Display device  20  may have functions, such as wireless charging, near field communication (NFC), and lighting, behind wall surface  10  instead of touch panel  21  or in addition to touch panel  21 . With such a configuration, it is possible to expect an effect of enhancing convenience for the user or the maintenance person, and enhancing a presentation effect of displaying information. 
     Since the surface member is arranged on the front surface, it is preferable that the touch panel  21  is configured by using a capacitance type in particular. In general, for displays with a size of 15 inches or less, a sensor pitch of about 5 mm is usually selected for capacitive touch sensor. However, in order to detect the touch operation through the thickness of the surface member as in the present embodiment, it is preferable to set the sensor pitch to 6 mm or more, preferably 6 mm to 10 mm. Also, on the input screen provided to the user, it is preferable to use icons of 3 cm square or more for each button. This is because the detection accuracy is reduced due to the large sensor pitch. 
     With these settings, even when the touch operation by the user&#39;s finger or the like is performed from the front side of the surface member  11 , the operation can be sufficiently detected, and a natural operation feeling can be provided to the user. 
     Display panel  23  is, for example, a liquid crystal display. Display panel  23  includes a color filter, a liquid crystal panel, and a light source such as an LED (any of these is not illustrated). A display image including predetermined information, the color of background, or a pattern is displayed to be visible on surface member  11  by light BL from a light source such as an LED. Display panel  23  may be either a non-light-emitting display having a light source or a light-emitting display. As display panel  23 , an OLED display, a matrix LED display, or other display devices provided with other light sources may be used. 
     Display panel  23  is adjusted such that the screen luminance after transmission through surface member  11  is 200 cd/m{circumflex over ( )}2 or less preferably about 80 cd/m{circumflex over ( )}2 when the display panel  23  is turned on. Accordingly, from the front side of surface member  11 , while display panel  23  itself becomes invisible from the outside, it is possible to make the display by display panel  23  sufficiently visually recognizable even through surface member  11 , and to prevent the display panel from being overly dazzled. 
     In order to hide the display panel  23  and the bezel around the display panel  23  from the front side of the surface member  11 , the total visible light transmittance of the surface member  11  and the reflecting member  12  is assumed to be 8% to 15%, preferably around 10%. In addition, in order to make the display on the surface member  11  to be 200 cd/m{circumflex over ( )}2 or less, preferably about 80 cd/m{circumflex over ( )}2, the screen brightness of the display panel  23  itself may be adjusted to 800 cd/m{circumflex over ( )}2 or more preferably 1,000 cd/m{circumflex over ( )}2. 
     1-2. Behavior 
     When the power of information display device  1  is turned on, display panel  23  is illuminated to display information on the display surface. At this time, only the information displayed on the display surface is visible to the user through surface member  11 . Meanwhile, when the power of information display device  1  is turned off, display panel  23  is turned off. At this time, display panel  23  becomes hardly seen from the user through surface member  11 , that is, invisible. In addition, even when the power of information display device  1  is turned on and display panel  23  is illuminated, a area (background color area) of the display on which information is not displayed becomes hardly seen from the user via surface member  11 , that is, invisible. 
     In a case where information display device  1  is used in an aircraft, as the information or the contents of the operation presented to user  13  (for example, a passenger or a crew), for example, transit information, seat lighting control, audio control, and DO NOT DISTURB setting, entertainment equipment control, seat reclining, attendant call and cancellation thereof, weather information, information on flight time or local time, presentation of seat number, display of lavatory availability, seat belt sign, door mode state display, and the like can be considered. Further, a function to turn off or to adjust brightness of the display of wall surface  10 . 
     Accordingly, in a narrow space such as a space around a seat in the aircraft, the user can be provided with a control unit such as seat reclining, air conditioning, and lighting while maintaining a simple and high-quality design in which there is no prominent display terminal or operation terminal. A controller having multiple functions or a function as a terminal for displaying information can be imparted to the wall having a designability. 
     In addition, since there are no physical buttons on the wall surface, when considering a usage by many and unspecified users, there is no case where malfunction is caused by spilling liquids such as juice, and the like, and it is possible to easily clean up since there is no unevenness. 
     Further, since an operation screen or information is displayed on wall surface  10  that appears to be empty for user  13  as necessary, it is possible to give user  13  a surprise. In particular, by expressing combination with surface member  11 , for example, it is possible to make the wood look protruded, or to make it look as if there are an object that is not actually present or an imaginary object on the wall, and a spatial presentation for user  13  is also possible. 
     1-3. Characteristics 
     In information display device  1  according to the embodiment, surface member  11  having a designability and light transmitting properties is disposed in front of display panel  23 , and surface member  11  covers the entire wall surface  10  or at least a surface larger than display panel  23 . When using information display device  1  according to the embodiment, it is possible to realize a seamless design having no seam between wall surface  10  and the information display region. Accordingly, it is possible to provide a user with an information display device in which characters, images, and the like appear on wall surface  10  and through which the user can perform an action such as an operation. 
     In addition, when the design permits, there may be a boundary between surface member  11  that covers display panel  23  and the other part of wall surface  10 . In this manner, it is possible to simply perform removal from the viewpoint of maintenance properties and the like. 
     Information display device  1  according to the embodiment can also have the following configuration. 
     Modification Example 1-1 
       FIG. 4  illustrates a usage environment of information display device  1  according to the modification example. 
     In the usage environment according to the modification example, information display device  1  is disposed on seat  101 . Information display device  1  according to the modification example is installed in the vicinity of the periphery of seat monitor  26  and displays information at a position that can be seen from user  13  (for example, a passenger) without largely moving the line of sight from seat monitor  26 . Accordingly, it is possible to realize an information display device which is easy to use and capable of minimizing the operation of the line of sight and neck of user  13 . The basic operation of information display device  1  according to the modification example is the same as that of the Embodiment 1 described above. 
       FIG. 5  is a configuration view of a system for operating information display device  1  according to the modification example. CPU  22  control display panel  23  disposed around seat monitor  26  to display necessary or useful information for the user based on the information from in-flight server  2 . For example, the information includes a fasten seat belt sign, information on the availability of lavatory, information on flight time, and the like. 
     With the above-described operation, in the modification example, it becomes possible to present an operation screen at a position that is easily seen from user  13 , to make the operator aware, or to realize an information display device that is more easily used. 
     Modification Example 1-2 
       FIG. 6  illustrates a usage environment of information display device  1  according to the modification example. 
     In the usage environment according to the modification example, information display device  1  is disposed on ceiling  61 . Information display device  1  is installed on a ceiling of a cabin or ceiling  61  of a seat compartment, and can display a starry sky as if user  13  is under an outdoor sky, or can display an advertisement. Accordingly, it is possible to realize an information display device that can alleviate the psychological tension and the like that user  13  receives in a narrow space in the cabin, and can effectively provide an advertisement. The basic operation of the information display device according to the embodiment is the same as that of Embodiment 1. 
       FIG. 7  is a configuration view of a system for operating information display device  1  according to the modification example. CPU  22  displays a night sky or blue sky video or an advertisement on the ceiling on display panel  23  based on information from in-flight server  2 . Depending on the information to be displayed, connection to in-flight server  2  may not be required. 
     With the above-described operation, in the modification example, it becomes possible to realize an information display device that alleviates the tension of the user and gives the user a surprise. 
       FIG. 8  is a schematic sectional view of information display device  1  according to the modification example. The information display device includes surface member  11 , reflection member (half mirror)  12 , and display panel  23 , and does not include a touch panel since no touch screen operation is required. 
     Modification Example 1-3 
       FIG. 9  illustrates a usage environment of information display device  1  according to the modification example. 
     In the usage environment according to the modification example, information display device  1  displays information mainly for crew  93  such as a cabin attendant, which is disposed on wall surface  94  of a cabin wall of the seat compartment. Information display device  1  according to the modification example can display a sign at a position that can be seen by crew  93  from a passage or via a camera image. Accordingly, as described in the related art, without interfering with the sense of luxury by disposing a display for displaying or a lamp on a passage, a wall, or a ceiling in the cabin, it is possible to reduce the load on crew  93  or to improve service for the passengers. The basic operation of the information display device according to the embodiment is the same as that of Embodiment 1. 
     The wall surface  94  may be a floor, a ceiling, or a wall surface of a door of a seat compartment. 
       FIG. 10  is a configuration view of a system for operating information display device  1  according to the modification example. CPU  22  displays an attendant call, a DON&#39;T DISTURB sign, a seat number, and the like on display panel  23  based on information from in-flight server  2 . Depending on the information to be displayed, connection to the in-flight server may not be required. 
     By the above-described operation, in the modification example, it is possible to realize an information display device that can reduce the workload on the crews  93  or improve the service for the passengers without interfering with the sense of luxury. 
     As one of usages of information display device  1  according to the modification example, the passenger name and the seat number may be displayed at the seat compartment entrance at the time of boarding and the like, and the seat number and the passenger name may not be displayed at other times. Accordingly, while improving the convenience of the passengers when boarding, the original decorative wall surface can be used without displaying the seat number or the passenger name at other times. As a result, it is possible to maintain a sense of luxury as a space while considering the privacy of passengers. 
       FIG. 11  is a schematic sectional view of information display device  1  according to the modification example. Information display device  1  includes surface member  11 , reflection member (half mirror)  12 , touch panel  21 , and display panel  23 , and each member is the same as those in Embodiment 1. Further, similar to Embodiment 1, information display device  1  may not include reflection member  12  and/or touch panel  21 . 
     Modification Example 1-4 
       FIG. 12  illustrates a usage environment of information display device  1  according to the modification example. 
     In the usage environment according to the modification example, information display device  1  is disposed on a wall surface of a work area of crew  93 , such as a galley in an aircraft, or on door surface  122  of a container. Information display device  1  can display information at a position where crew  93  can see the information while working. Until now, it was necessary for crew  93  to confirm requests, orders, and the like from each seat using an information terminal (not illustrated) near the door. However, according to information display device  1  according to modification example, crew  93  can grasp requests from each seat and input a response status while performing the work of serving and preparing, and can improve work efficiency. Furthermore, an information display device can be realized without deteriorating the sense of luxury of the galley used as a sales space these days. The basic operation of the information display device according to the embodiment is the same as that of Embodiment 1. 
     Door surface  122  may be a wagon door or a wall surface which are disposed on a floor, a ceiling, or a galley. 
       FIG. 13  is a configuration view of a system for operating information display device  1  according to the modification example. CPU  22  controls display, on display panel  23 , the order of drinks, request for blankets, and the like from the passenger, call information, status of the request (response history), and the like, with the accompanying seat number, and the like, based on the information from in-flight server  2 . Crew  93  can operate touch panel  21  to input necessary information. Depending on the information to be displayed, connection to the in-flight server may not be required. 
     By the above-described operation, in the modification example, it is possible to realize an information display device capable of reducing the work load on crew  93  or improving the service for the passengers without interfering with the sense of luxury in the galley. 
     By forming information display device  1  according to the modification example to be thin, it is possible to make effective use of the space of the container. 
       FIG. 14  is a schematic sectional view of information display device  1  according to the modification example. Information display device  1  includes surface member  11 , reflection member (half mirror)  12 , touch panel  21 , and display panel  23 , and each member is the same as those in Embodiment 1. Further, similar to Embodiment 1, information display device  1  may not include reflection member  12  and/or touch panel  21 . 
     Surface member  11  can be formed of a waterproof material. Accordingly, it is possible to realize a convenient information display device that can be safely operated even in a case of using water in the work area of crew  93 . 
     Modification Example 1-5 
       FIG. 15  illustrates a usage environment of information display device  1  according to the modification example. 
     In the usage environment according to the modification example, information display device  1  is disposed, for example, on seat  101  or the wall of the seat compartment. Information display device  1  is disposed at a position that is difficult to be seen or invisible to a third party (other passenger or crew and the like), such as a lavatory availability sign. Although seat  101  or the wall of the seat compartment is a wall that usually give a sense of luxury, the availability of the lavatory is displayed such that only user  13  can understand in a case where a desire for excretion is felt. There are many cases where the display sign indicating the vacancy of the lavatory is installed on the upper area of the wall in the related art, but by installing information display device  1  at a place where the line of sight easily reaches in seat  101  or the compartment, user  13  can understand the state of the lavatory without greatly moving the line of sight or the neck, and an effect of enhancing convenience of the user is expected. In addition, when the availability of the lavatory is constantly displayed, the sense of luxury or designability deteriorates, but information display device  1  according to the modification example does not make the user feel the presence of the device while the device is unnecessary and the information can be seen only to the user regarding the contents that are not known to a third party such as other passengers. 
       FIG. 16  is a configuration view of a system for operating information display device  1  according to the modification example. CPU  22  controls display panel  23  to display the availability of the lavatory and the like based on the information from in-flight server  2 . Depending on the information to be displayed, connection to the in-flight server may not be required. 
     Modification Example 1-6 
       FIG. 46  illustrates a usage environment of information display device  1  according to the modification example. 
     In the usage environment according to the modification example, information display device  1  is disposed, for example, on seat  101  or the wall of the seat compartment. Information display device  1  is disposed at a position within a distance of 50 cm around the user&#39;s face. Normally, since the information display monitor emits light by itself, it is dazzling to the user when it is placed around the face, and there will be a problem that sleep is disturbed, for example. In addition, the heat of the monitor is transmitted to the user, which may cause discomfort. 
     However, since the display device is arranged behind the surface member  11  in the information display device  1 , information can be displayed from the vicinity without giving discomfort to the user in terms of brightness and temperature. Therefore, at the time such as at night, it is possible to present the information without giving discomfort to the user even in the vicinity of the face. The vicinity of the face here is higher than the position of the user&#39;s shoulder and forward of the position of the ear, and is a distance within 50 cm from the side of the cheek and the eyes around the face as starting points is assumed. Similarly, when the user puts the backrest of the seat down to the bed mode, that is, even when the information is displayed at the position where the user can see directly when the user takes the sleeping posture, the user may not feel uncomfortable. 
     2. Embodiment 2 
     In the embodiment illustrated in  FIG. 17 , information display device  1 B including surface member  11  and display device  20  has an attachment feature to cabin structure (wall, door, monument and the like)  100 . 
     Information display device  1 B is used in any usage environment similar to the above-described embodiment. The description of information display device  1 B having the same configuration and function as those of the above-described embodiment will be omitted, and the same reference numerals will be given to the same configuration members. 
     The attachment feature includes a structural body  100   a , and structural body  100   a  has retainers  105   a  and  105   b . Structural body  100   a  is attached to the back side of surface member  11  at a position that does not overlap the display area of display panel  23 . Retainers  105   a  and  105   b  are provided on the back side and/or the side portion of structural body  100   a  or surface member  11  at positions that are invisible from the front side of surface member  11 , and retain information display device  1 B to structure  100 . Retainers  105   a  and  105   b  and/or other locations are fixed with screws  106  and the like. 
     Retainers are preferably provided on at least one side, and more preferably provided on a plurality of sides in different directions similar to retainers  105   a  and  105   b  illustrated in  FIG. 17 . 
     At least surface member  11  side of structural body  100   a  is colored with substantially the same color (for example, black) as the background color of the display surface when display panel  23  is turned off or turned on. Accordingly, it is possible to prevent the boundary between structural body  100   a  and display panel  23  from being seen through surface member  11 . 
     Information display device  1 B can be configured to be easily detached from and attached to structure  100 , and an information display device that is easy to maintain can be realized. For example, a configuration in which the fixing on retainer  105   b  side among retainers illustrated in  FIG. 17  is released and information display device  1 B is attached or detached by rotating information display device  1 B with retainer  105   a  as a fulcrum can also be employed. 
     Desirable performances for the display and touch panel used in this embodiment are the same as those described in the first embodiment. 
     3. Embodiment 3 
     Information display device  1 C according to the embodiment illustrated in  FIG. 18  has a configuration in which an integrated unit of a film having a designability and light transmitting properties and a transparent fixing plate on the front side of display panel  23  is pressed. With such a configuration, it is possible to display and operate information as necessary while realizing a seamless design, and to make system maintenance easy. 
     Information display device  1 C is used in any usage environment similar to those of the above-described embodiments. The description of information display device  1 C having the same configuration and function as those of the above-described embodiments will be omitted, and the same reference numerals will be given to the same configuration members. 
       FIG. 18  is a schematic sectional view of information display device  1 C of the embodiment. Information display device  1 C includes surface member  11 , reflection member (half mirror)  12 , transparent member  53 , structural body  54 , touch panel  21 , display panel  23 , and housing  57 . In order to sufficiently exhibit the effect of hiding the presence of display panel  23  and the effect of reflection member  12  for transmitting the contents displayed by display panel  23  and displaying the contents on surface member  11 , it is preferable that reflection member  12  is disposed at a position close to surface member  11 . This is because, when there is a gap between reflection member  12  and surface member  11 , there is a possibility that the light from display panel  23  transmitted through reflection member  12  is diffused and displayed on surface member  11  with blur. However, in a case where the requirement for display quality is not so high, the positions of reflection member  12  and transparent member  53  may be reversed. As long as the function as the information display device is satisfied, the order of the disposition may be any order. 
     Surface member  11  may not have a surface area larger than that of display panel  23 . 
     Transparent member  53  is a plate having a certain hardness. Transparent member  53  is preferably as thin as possible in order to reduce the blur of the display on surface member  11 , for example, approximately 0.4 mm to 2.0 mm and more preferably approximately 1.5 mm to 2.0 mm. 
     In order to make touch panel  21  operable, it is preferable that surface member  11  and reflection member  12  are formed by an insulator similar to Embodiment 1. Further, for the same reason, it is preferable that transparent member  53  is also similarly an insulator and has a sheet resistance value of 30 megaohms or more. 
     The height of structural body  54  is preferably formed such that space  55  is as small as possible. This is because, by shortening the distance between display panel  23  and reflection member  12  and surface member  11 , diffusion of light can be suppressed, and the blur of display on surface member  11  can be minimized. Space  55  is preferably as small as possible. Preferably, a state where touch panel  21  is press fitted against transparent member  53  without any gap, for example, a state of 0 mm or a state close thereto is preferable. 
     Housing  57  is fixed to structural body  54  by fixing units such as screws. By fixing transparent member  53  to structural body  54 , surface member  11  and reflection member  12  can be installed on the display surface side of display panel  23 . Accordingly, information display device  1 C can be configured without directly pasting surface member  11  or reflection member  12  to touch panel  21  or display panel  23 . However, in a case where surface member  11  or reflection member  12  alone has sufficient strength, transparent member  53  can be omitted. 
     With the above-described configuration, information display device  1 C according to the embodiment can be disposed without making the user feel the position and the presence of display panel  23 . Further, in information display device  1 C, surface member  11 , reflection member  12 , and transparent member  53  can be collectively detached from structural body  54 . Accordingly, without taking off the entire wall on which information display device  1 C is attached, only display panel  23  or touch panel  21  can be detached, and display  56  can be easily accessed and can be repaired or replaced. Further, after the repair or the replacement of information display device  1 C, surface member  11 , reflection member  12 , and transparent member  53  can be reused. 
     Desirable performances for the display and touch panel used in this embodiment are the same as those described in the first embodiment. 
     4. Embodiment 4 
     In information display device  1 D according to the embodiment, at least the front surface of structural body  54  and/or a region (a region that surrounds the display surface) other than the display surface of display panel  23  between display panel  23  and surface member  11 , have a colored layer colored with substantially the same color (for example, black) as the background color of the display surface when display panel  23  is turned off or turned on. Hereinafter, examples of such a colored layer will be specifically described. 
     Information display device  1 D is used in any usage environment similar to the above-described embodiment. The description of information display device  1 D having the same configuration and function as those of the above-described embodiments will be omitted, and the same reference numerals will be given to the same configuration members. 
     Information display device  1 D according to the embodiment is different from Embodiment 3 in that mask print layer  83  (an example of the colored layer) is provided at least a part other than the display surface of display panel  23 . With this configuration, it is possible to prevent see-through of a part having no display panel  23 , and when viewed from the front surface side of surface member  11 , the display surface of display panel  23  and other regions are made the same, it is possible to make it difficult to see display panel  23 . 
       FIG. 19  is a schematic sectional view of information display device  1 D of the embodiment. Information display device  1 D includes surface member  11 , reflection member (half mirror)  12 , transparent member  53 , mask layer  83 , structural body  54 , touch panel  21 , display panel  23 , and housing  57 . The function of information display device  1 D is satisfied even when reflection member  12  is disposed between transparent member  53  and mask layer  83 . 
     Housing  57  is fixed to structural body  54  by fixing units such as screws. By fixing transparent member  53  to structural body  54 , surface member  11  or reflection member  12  can be installed on the display surface side of display panel  23 . Accordingly, information display device  1 C can be configured without directly pasting surface member  11  or reflection member  12  to touch panel  21  or display panel  23 . However, in a case where such a configuration is employed, while the region where display panel  23  is located transmits light, the region where structural body  54  is located does not transmit light on the surface of surface member  11 , and accordingly, the boundary part between display panel  23  and structural body  54  is visible. In order to prevent this, in the embodiment, mask layer  83  is disposed at the boundary part. 
     Mask layer  83  is disposed so as to surround the display surface of display panel  23 . Mask layer  83  is preferably colored with substantially the same color as the background color of a region other than the region that displays the information, which is a display surface of display panel  23  when display panel  23  is turned off or when display panel  23  is turned on. Accordingly, the boundary between display panel  23  and structural body  54  can be made prominent through surface member  11 . 
     The region where mask layer  83  is provided is preferably provided not only on structural body  54  but also on a region excluding the region of the display surface where display panel  23  displays information. In particular, the part having no mask layer  83  may be smaller than the entire region of display panel  23  such that the region where mask layer  83  is provided covers the edge of display panel  23 . By doing so, it can be difficult to understand the difference in appearance between display panel  23  and the other regions when wall surface  10  ( FIG. 1 ) viewed from user  13  is viewed, that is, when the wall surface is viewed from the front side of surface member  11 . 
     With the above-described configuration, it is possible to realize an information display device that does not make the user feel the position and the presence of the display panel. 
     Desirable performances for the display and touch panel used in this embodiment are the same as those described in the first embodiment. 
     Modification Example 4-1 
     As illustrated in  FIG. 20 , information display device  1 D- 1  ( FIG. 19 ) according to Embodiment  4  may be configured such that the corners of inner edge  83   b  of mask layer  83  that surrounds display surface  231  of display panel  23  are formed in an arc shape. Alternatively or additionally, mask layer  83  may be colored by applying a gradation from outer edge  83   a  to inner edge  83   b.    
     Accordingly, in a case of viewed from the front surface side of surface member  11 , the difference in appearance between the part where display panel  23  is located and the other part can be made more difficult to understand. 
     In the modification example, when user  13  sees from surface member  11 , the part where mask layer  83  is not installed is formed in a polygonal shape with rounded corners, or a circular or elliptical shape. Display panel  23  is usually rectangular, and its four corners are almost right angles. However, when the display surface is rectangular due to a difference in appearance when viewed from the front surface side of surface member  11 , user  13  inevitably feels that there is a display on the rear surface. Here, the part where mask layer  83  is not installed is formed into a polygonal shape with rounded corners, or a circular or elliptical shape such that user  13  cannot see the rectangular shape on the display surface. Accordingly, user  13  does not recognize that display panel  23  is behind wall surface  10 . Therefore, only the displayed information appears to emerge from wall surface  10 , and user  13  can be given a fresh surprise. 
     Furthermore, mask layer  83  may be colored by applying a gradation from outer edge  83   a  illustrated in  FIG. 20  to inner edge  83   b . In this case, by gradually fading the color toward display surface  231 , that is, inward, that is, by increasing the light transmittance, at the boundary part between mask layer  83  and display surface  231  of display panel  23 , the difference in appearance between display surface  231  and the other parts when viewed from the front surface side of surface member  11  becomes more difficult to understand. Accordingly, it is possible to realize a configuration that does not make user  13  aware of the presence of display panel  23 . 
     Modification Example 4-2 
       FIG. 21  illustrates a modification example of information display device  1 D attached by the structural body.  FIG. 21  is a schematic sectional view of information display device  1 D- 2  according to the modification example. Information display device  1 D- 2  includes surface member  11 , transparent member  82 , mask layer  83 , structural body  54 , reflection layer (half mirror)  85 , touch panel  21 , display panel  23 , and housing  57 . 
     The thickness from surface member  11  to reflection layer  85  is preferably as thin as possible in order to minimize the blur of the display on surface member  11 . The thickness is, for example, approximately 0.4 mm to 2.0 mm, preferably approximately 1.5 mm to 2.0 mm. 
     In order to make touch panel  21  operable, it is preferable that surface member  11 , transparent member  82 , and reflection layer  85  are formed by an insulator similar to Embodiment 1. 
     In a case where reflection layer  85  is disposed in a region that does not overlap structural body  54  as in the modification example, transparent surface member  11  has a different appearance when viewed from the front surface side by an object on the lower layer, that is, on the back side. Since information display device  1 D- 2  includes reflection layer  85 , the information displayed on display panel  23  is displayed on surface member  11  while hiding the presence of display panel  23 . However, the appearance when viewed from the front surface differs between the place where reflection layer  85  is located under surface member  11  and the other places. Here, in the modification example, by coloring mask layer  83 , for example, white or gray, the appearance of wall surface  10  ( FIG. 1 ) seen from user  13  and the appearance of display region  1   a  ( FIG. 1 ) are prevented from becoming different from each other. The color of mask layer  83  is changed in accordance with the specifications of surface member  11 , the luminance of the environment, the color of structural body  54 , and the like. In a case of white or gray, an effect can be expected in which the color of a certain place of reflection layer  85  looks similar to other places. 
     5. Embodiment 5 
     As illustrated in  FIG. 22 , in information display device  1 E according to the embodiment, slight-adhesive layer  32  that can be peeled off again is disposed in front of display panel  23 , and surface member  11  having a designability and light transmitting properties is disposed on the front side. Information display device  1 E according to the embodiment reduces the blur on the display while realizing a seamless design having no seam between the wall surface and the information display region, and provides a comfortable operation feeling without an air gap in front of the touch panel. 
     Information display device  1 E is used in any usage environment similar to the above-described embodiment. The description of information display device  1 E having the same configuration and function as those of the above-described embodiments will be omitted, and the same reference numerals will be given to the same configuration members. 
       FIG. 22  is a schematic sectional view of information display device  1 E of the embodiment. Information display device  1 E includes surface member  11 , slight-adhesive layer  32 , reflection layer (half mirror)  33 , touch panel  21 , display panel  23 , structural body  54 , and housing  57 . Information display device  1 E is fixed to structural body  54  with housing  57 , and structural body  54  is fixed to fixing member  38 . Information display device  1 E may not include reflection layer  33  and/or touch panel  21  in accordance with the function. 
     Slight-adhesive layer  32  is a member such as a film having the light transmitting properties and having a weak or slight adhesiveness on which both surfaces or one of the surfaces can be peeled off again. Slight-adhesive layer  32  prevents a gap (air gap) between the lower member (reflection layer  33  in the illustrated example, touch panel  21  in a case where reflection layer  33  is not provided, and display panel  23  in a case where touch panel  21  is not provided) and surface member  11 . With the configuration, the information displayed on display panel  23  can be displayed on surface member  11  without the blur as much as possible. In particular, in a case where information display device  1 E includes touch panel  21 , the operation feeling of touch panel  21  deteriorates when the gap (air gap) is present. However, the presence of slight-adhesive layer  32  can improve the operation feeling of touch panel  21  and realize a user-friendly information display device. 
     Since slight-adhesive layer  32  can be peeled off again, when display device  20  breaks down, only display device  20  can be detached from the wall without breaking surface member  11 , and accordingly, it is possible to make the maintenance easy. In the example of  FIG. 22 , display device  20  can be detached from surface member  11  with housing  57  by removing fixing member  38  disposed on the rear surface of housing  57 . Accordingly, display device  20  can be replaced or repaired without breaking or damaging surface member  11 . 
     The specific example here is merely an example, fixing member  38  may not be provided on the rear surface, a fixing arm may be projected from housing  57 , and the arm may be fixed to structural body  54 . In this case, there are various fixing members, such as a method in which there is an attaching screw on the side surface of housing  57 , and after fixing housing  57  to structural body  54  with the attaching screw, structural body  54 , housing  57 , and display device  20  are collectively pressed against surface member  11  and fixed. 
     Slight-adhesive layer  32  may not have the light transmitting properties as long as the slight-adhesive layer has an area smaller than the area of the display surface of display panel  23  and a shape that avoids display contents. However, when the area is equal to or larger than the area of the display surface, the configuration that has the light transmitting properties and does not allow bubbles to enter is preferable. Accordingly, it is possible to prevent the information displayed on surface member  11  from blurring, and to realize an information display device which sharply displays information and is easily used by the user. 
     Furthermore, slight-adhesive layer  32  may be formed by imparting a slight adhesive to the surface of a lower layer member (reflection layer  33  in the illustrated example, and touch panel  21  in a case where there is no reflection layer  33 ). Otherwise, the slight adhesive may be imparted only to the front side of slight-adhesive layer  32 , that is, only to surface member  11  side. However, as described above, by realizing a sheet on which a slight adhesive is imparted on both surfaces of the film having the light transmitting properties, in a case where there is damage or intrusion of dust due to peeling during the maintenance, it is possible to replace display device  20  only by replacing the sheet. 
     Reflection layer  33  is a material such as a half mirror, and reflects the external light, but transmits light from display panel  23  on the inside. By disposing reflection layer  33  between surface member  11  and display panel  23 , the boundary between wall surface  10  and display region  1   a  can be made more difficult to understand as illustrated in  FIG. 1 . While the presence of display panel  23  itself is prevented from being seen through surface member  11  by the external light reflection characteristic of reflection layer  33 , the display contents of display panel  23  can be presented to the user by the light transmission characteristic. 
     In addition, when surface member  11  has the sufficient external light reflection characteristic and the light transmission characteristics of the internal light source emitted from display panel  23 , reflection layer  33  may be omitted. 
     Surface member  11 , slight-adhesive layer  32 , and reflection layer  33  are insulators such that touch panel  21  can operate, and preferably have a higher insulation resistance value. 
     Reflection layer  33  may be formed by a metal vapor-deposited film that can transmit electromagnetic waves or a film that can produce a metallic luster by laminating a resin material. In particular, an indium or tin-deposited film, a film formed by laminating a PET material, or the like is preferable. Accordingly, it becomes easy to ensure both the performance of touch panel  21  and to hide display panel  23 . 
     Fixing member  38  is a sheet metal, a plastic component, or the like, and has a function of pressing display device  20  against surface member  11 . Since slight-adhesive layer  32  or the weak-adhesive layer itself does not have a bonding force enough to fix display device  20  to surface member  11 , the layers are used as a unit that further presses slight-adhesive layer  32  against surface member  11 . Fixing member  38  may be a plate material such as a sheet metal or a plastic component. Further, the same effect can be obtained even when the arm is projected from housing  57  and fixed to structural body  54 . Furthermore, a configuration in which display device  20  is pressed against surface member  11  by assembling with structural body  54  in a state of being attached to a fixed component (not illustrated) by a screw hole (not illustrated) provided on the side surface of housing  57 , can also be realized. 
     In information display device  1 E, the following effects can be obtained by disposing surface member  11 , slight-adhesive layer  32 , reflection layer  33 , touch panel  21 , and display panel  23  in this order. Since the place where reflection layer  33  is required is limited to the front of display panel  23 , the cost can be reduced by placing reflection layer  33  only in the place where reflection layer  33  is required, and the range that can be repaired by maintenance can be expanded. However, in order to sufficiently exhibit the effect of making display panel  23  invisible from the outside and the effect of transmitting the contents displayed on display panel  23  and displaying the contents on surface member  11 , which are the effects of reflection layer  33 , it is preferable that reflection layer  33  is disposed at a position close to surface member  11 . This is because, when there is a gap between reflection layer  33  and surface member  11 , there is a possibility that the light transmitted through reflection layer  33  from display panel  23  is diffused and displayed on surface member  11  with blur. In other words, the position of reflection layer  33  and the position of slight-adhesive layer  32  may be in the order illustrated in  FIG. 22  or in the order reverse thereto, depending on whether the priority is given to display quality requirements or cost or maintenance. 
     Furthermore, in information display device  1 E, since slight-adhesive layer  32  can be peeled off again, surface member  11  and display device  20  can be separated from each other in terms of maintenance. Accordingly, maintenance work can be performed efficiently. 
     Desirable performances for the display and touch panel used in this embodiment are the same as those described in the first embodiment. 
     Modification Example 5-1 
     As illustrated in  FIG. 23 , information display device  1 E- 1  according to the modification example is different from that of Embodiment 5 described above in that slight-adhesive layer  32  that can be peeled off again is adhered to front of display panel  23 , and surface member  11  having a designability and light transmitting properties and base member  60  having light transmitting properties are integrated with each other on the front surface, that is, on the surface side. In information display device  1 E- 1 , in addition to the effect similar to that of Embodiment  5  described above, surface member  11  cannot be damaged during the maintenance, and further, display device  20  can be attached regardless of the surface state of surface member  11 . 
     In Embodiment 5 described above, in a case where surface member  11  is made of a brittle material such as cloth, for example, there is a case where surface member  11  is damaged even by the adhesive force of slight-adhesive layer  32 , or there is a case where the adhesive effect of slight-adhesive layer  32  is not exhibited depending on the surface state where there is the unevenness on the rear surface of surface member  11  by the method of weak adhesion, such as the adhesion by static electricity. Therefore, by inserting base member  60  between surface member  11  and slight-adhesive layer  32 , damage to surface member  11  by slight-adhesive layer  32  can be reduced, and the effect of slight-adhesive layer  32  can be maintained. 
     Base member  60  is a thin plate-like member having the light transmitting properties. Base member  60  may be fixed to surface member  11  by providing an adhesive layer (not illustrated) only on surface member  11  side so as to remain on structural body  54  side together with surface member  11  when display device  20  is detached. Otherwise, base member  60  may be fixed by being sandwiched between surface member  11  and structural body  54 . Base member  60  has, for example, a smooth flat surface or a surface state that allows the bubbles to escape easily such that slight-adhesive layer  32  functions effectively. 
     Base member  60  is preferably as thin as possible in order to reduce the blur of the display on surface member  11 , for example, approximately 0.4 mm to 2.0 mm, preferably 1.5 mm to 2.0 mm. In order to make touch panel  21  operable, it is preferable that surface member  11 , slight-adhesive layer  32 , and reflection layer  33  are formed by an insulator similar to Embodiment  5  described above. Further, for the same reason, it is preferable that base member  60  is also similarly an insulator and has a sheet resistance value of 30 megaohms or more. 
     Base member  60  may be formed by providing a region that performs mask printing and partially has no light transmitting properties, or by creating the base member with a material having no light transmitting properties and by partially providing a through-hole or a thinned part to allow light transmission. Accordingly, display region  1   a  ( FIG. 1 ) can be limited without processing surface member  11 , and leakage or transmission of extra light due to the backlight and the like of display panel  23  can be prevented. In this method, for example, by providing a gradation, it is also possible to make it difficult to understand the boundary between the place where the reflection layer is provided on the rear surface of surface member  11  and the place where the reflection layer is not provided. The function is performed as long as the size of base member  60  is larger than slight-adhesive layer  32 , but from the above-describe viewpoint, it is preferable that base member  60  has a surface area at least equal to or larger than the display surface of display panel  23 . Although base member  60  can be configured even on the entire surface of wall surface  10  ( FIG. 1 ), the addition of an extra configuration leads to an increase in cost, and accordingly, it is preferable that the area of base member  60  slightly exceeds not the entire surface of the wall surface with design but the surface area of the display surface of display panel  23 . Furthermore, in addition to the purpose of making display panel  23  invisible through surface member  11 , display panel  23  can also add expression in a video displayed from display panel  23  for various applications by providing unevenness on the surface of base member  60  or providing optically refracted location. 
     The same effect as described above can be expected even when a mask layer is provided between touch panel  21  and the surface of display panel  23 . However, since the layer is a part that changes depending on the usage environment and usage method of information display device  1 E- 1 , it is considered that it is efficient to perform mask printing on base member  60  in consideration of not having to process surface member  11 . 
     Information display device  1 E- 1  may not have to provide slight-adhesive layer  32  or reflection layer  33  by providing a reflective material or a slight adhesive on the front side of base member  60 . Accordingly, the number of configuration members can be reduced, the distance between surface member  11  and display panel  23  can be reduced, and the display on display panel  23  can be expressed more sharply. However, it is preferable to separately provide slight-adhesive layer  32  and reflection layer  33  from the viewpoint of ease of repair when display device  20  is removed from surface member  11  for maintenance as described above. 
     In information display device  1 E- 1 , the following effects can be obtained by disposing surface member  11 , base member  60 , slight-adhesive layer  32 , reflection layer  33 , touch panel  21 , and display panel  23  in this order. Similar to Embodiment  5  described above, the position of reflection layer  33  may be between surface member  11  and base member  60  or between base member  60  and slight-adhesive layer  32 , but it is preferable that the members and the like are disposed in the above-describe order from the viewpoint of ease of the maintenance. 
     In addition, information display device  1 E- 1  may not include reflection layer  33  or touch panel  21  for the same reason and condition as those in Embodiment 5 described above. 
     With the above-described configuration, information display device  1 E and information display device  1 E- 1  according to Embodiment 5 and the modification examples thereof can be disposed without causing the user to feel the position and the presence of display panel  23  through surface member  11 , and the information display with high designability can be realized. Furthermore, information display devices  1 E and  1 E- 1  can be replaced by detaching only display device  20  without peeling off the entire wall surface  10  ( FIG. 1 ) at the equipment failure. According to the configuration described in the embodiment, display device  20  can be detached from structural body  54  without damaging surface member  11 , and display device  20  can be brought into close contact with surface member  11  regardless of the surface state or material of surface member  11 . Further, a configuration in which the display region can be freely limited without processing surface member  11  or display panel  23  can be realized. 
     6. Embodiment 6 
     As illustrated in  FIG. 24 , information display device  1 F according to the embodiment is different from those in the above-described embodiments in that compressible cushion sheet  37  is disposed between touch panel  21  and surface member  11 . With the configuration, a void (air gap) hardly occurs between touch panel  21  and surface member  11 , and touch panel  21  can be reliably operated. 
     Information display device  1 F is used in any usage environment similar to the above-described embodiments. The description of information display device  1 F having the same configuration and function as those of the above-described embodiments will be omitted, and the same reference numerals will be given to the same configuration members. 
       FIG. 24  is a schematic sectional view of information display device  1 F of the embodiment. Information display device  1 F includes surface member  11 , cushion sheet  37 , touch panel  21 , display panel  23 , and housing  57 . Display panel  23  is disposed so as not to be seen through surface member  11 . The components that configure information display device  1 F do not necessarily need to be assembled integrally. The components may be disposed apart from each other or may be configured to be easily separated from each other. For example, cushion sheet  37  may be configured to be easily detachable from other components. Accordingly, in a case where cushion sheet  37  needs to be replaced due to aging or the like, an effect that maintenance becomes easy is achieved. 
     The structural body  35  is an aluminum plate or the like for reinforcing surface member  11 . A case where surface member  11  has sufficient strength may not be necessary. 
     Cushion sheet  37  has the light transmitting properties, and is disposed between touch panel  21  and surface member  11  to be compressible. Since cushion sheet  37  is compressible, even in a case where surface member  11  has some unevenness, cushion sheet  37  can be disposed without forming a void between the front side of touch panel  21  and the back side of surface member  11 . In general, it is known that the sensitivity of touch panel  21  is extremely reduced by the air entering between the member disposed on the surface and touch panel  21  in touch panel  21  of a capacitive sensing method or a resistive membrane method. In the embodiment, the sensitivity of touch panel  21  can be reliably maintained by not forming a void between touch panel  21  and surface member  11 . In addition, cushion sheet  37  can prevent the video displayed on display panel  23  from being refracted due to the void and from being seen blur. 
     Cushion sheet  37  may be a member made of, for example, a gel material such as silicon, polyurethane, or urethane. Cushion sheet  37  may be plastically deformed by compression by an external force or may be elastically deformed by an external force. In particular, the positional relationship between surface member  11  and cushion sheet  37  may be displaced when display device  20  is subjected to some vibration or the position of fixing member  38  is displaced due to aging. Even in such a case, by using a material having elasticity as cushion sheet  37 , a void is hardly generated between the configuration components. Further, cushion sheet  37  can be easily reused. 
     Display device  20  is fixed to the back surface side of surface member  11  by fixing member  38 . In the embodiment, display device  20  is fixed by pressing housing  57  against surface member  11  side with fixing member  38 . However, the fixing method is an example, and any fixing method may be used as long as display device  20  can be fixed to the back surface side of surface member  11 . 
       FIG. 25  is an exploded sectional view of information display device  1 F according to the embodiment. As illustrated in the drawing, in the embodiment, cushion sheet  37  has a larger area than touch panel  21  and is disposed so as to cover the entire touch surface. By making the surface area of cushion sheet  37  larger than the display surface of display panel  23  or the operation region of touch panel  21 , even in a case where there is a physical error in the position where cushion sheet  37  is pasted, the display surface of display panel  23  can be reliably operated. However, the configuration is not essential, and cushion sheet  37  may have the same area as that of touch panel  21  or may be disposed so as to cover a part of touch panel  21 . 
     In information display device  1 F, by disposing surface member  11 , cushion sheet  37 , touch panel  21 , and display panel  23  in this order, a void between surface member  11  and touch panel  21  can be prevented, and the operation of touch panel  21  can be kept to be normal. In particular, there are a case where surface member  11  is a wall material and a case where there are some unevenness. In this case, a void is easily formed between surface member  11  and touch panel  21 . However, due to the presence of cushion sheet  37 , such a void can be effectively prevented, and the operability of touch panel  21  can be maintained. 
     Desirable performances for the display and touch panel used in this embodiment are the same as those described in the first embodiment. 
     Modification Example 6-1 
       FIG. 26  illustrates information display device  1 F- 1  according to a modification example. As illustrated in the drawing, in information display device  1 F- 1 , even in a case where surface member  11  is configured not in a flat shape but in a curved shape, cushion sheet  37  having a sufficient thickness is disposed, and accordingly, following surface member  11 , touch panel  21  can be reliably brought into an operable state. 
     Modification Example 6-2 
       FIG. 27  illustrates information display device  1 F- 2  according to another modification example. As illustrated in the drawing, in information display device  1 F- 2 , by disposing film  58  having an adhesive layer between surface member  11  and cushion sheet  37 , the generation of bubbles generated when cushion sheet  37  is in contact with surface member  11  is prevented. Accordingly, it is possible to prevent the generation of a void between touch panel  21  and surface member  11  and to make touch panel  21  more reliably operable. Furthermore, display device  20  can be easily separated from surface member  11 . 
       FIG. 27  is a schematic sectional view of information display device  1 F- 2  according to the modification example. Information display device  1 F- 2  includes surface member  11 , film  58 , cushion sheet  37 , touch panel  21 , display panel  23 , and housing  57 . Display panel  23  is disposed so as not to be seen through surface member  11 . 
     Information display device  1 F- 2  is different from those of the above-described embodiments in that non-adhesive film  58  is disposed between surface member  11  and cushion sheet  37 . Film  58  is made of, for example, flame-retardant polycarbonate (PC) or polyether terephthalate (PET) or fluoropolymer having a thickness of approximately 0.05 mm to 0.1 mm. When the thickness of the film is extremely thick, there is a possibility that the elasticity of the film becomes too strong and it is not possible to follow the unevenness of the front surface of surface member  11 , and thus, a case where the thin film of the thickness is 0.05 mm or the like can expect more effect. 
     In non-adhesive film  58 , the surface of non-adhesive film  58  may be processed by cutting or finely cutting the most surface of the film. Accordingly, the processed surface of film  58  becomes easier to follow the unevenness of surface member  11 , and the generation of void therebetween can be prevented. 
     Embossing or Texture(extremely fine unevenness) may be provided on the back side (display panel  23  side) of surface member  11 . Accordingly, the effect of eliminating the adhesiveness of the back surface of surface member  11  and suppressing the generation of bubbles between surface member  11  and cushion sheet  37  can be expected. 
     In information display device  1 F- 2 , by disposing non-adhesive film  58  between surface member  11  and cushion sheet  37 , when display device  20  including touch panel  21  breaks down, surface member  11  can be detached without breaking, only display device  20  can be easily detached from the wall surface, and accordingly, the maintenance work can become easy. 
     Instead of non-adhesive film  58 , a non-adhesive material is applied or painted to the front side and/or back side of cushion sheet  37 , or the front side and/or the back side of cushion sheet  37  are processed to have non-adhesiveness, and accordingly, a non-adhesive layer may be formed. 
     Otherwise, non-adhesive film  58  maybe slight-adhesive film or other slight adhesion layer. 
     Modification Example 6-3 
       FIG. 28  illustrates information display device  1 F- 3  according to another modification example. As illustrated in the drawing, information display device  1 F- 3  may include weakly adhesive film  59  on the back side (touch panel  21  side) of cushion sheet  37  in addition to the configuration illustrated in  FIG. 29 . With the configuration, cushion sheet  37  can be peeled off from touch panel  21  again. Accordingly, even when cushion sheet  37  becomes dirty, torn, or deformed, only cushion sheet  37  can be detached from information display device  1 F- 3  and replaced without breaking touch panel  21 . Thereby, the maintenance work can become easy. 
     Otherwise, weakly adhesive film  59  may be a non-adhesive film or another non-adhesive layer. The configuration can also make the maintenance work easy. 
     7. Embodiment 7 
     As illustrated in  FIG. 29 , information display device  1 G according to the embodiment performs a decoration process such as painting or printing on the front side and the back side of surface member  11  having the light transmitting properties, and accordingly, the adjustment of the light transmittance is possible without being affected by the pattern of the front surface of surface member  11 , and an information display device with excellent appearance can be realized. 
     Information display device  1 G is used in any usage environment similar to the above-described embodiment. The description of information display device  1 G having the same configuration and function as those of the above-described embodiments will be omitted, and the same reference numerals will be given to the same configuration members. 
       FIG. 29  is a schematic sectional view of information display device  1 G of the embodiment. Information display device  1 G includes surface member  11 , cushion sheet  37 , touch panel  21 , display panel  23 , and housing  57 . An effect that the replacement during the maintenance becomes easy as cushion sheet  37  can be peeled off from display device  20 . However the function as the information display device  1 G can be satisfied without cushion sheet  37 . 
     Display device  20  is fixed to the back surface side of surface member  11  by fixing member  38 . In the embodiment, display device  20  is fixed by fixing housing  57  to the structural body  35  and pressing housing  57  against surface member  11  side with fixing member  38 . However, the fixing method is an example, and any fixing method may be used as long as display device  20  can be fixed to the back surface side of surface member  11 . 
     Surface member  11  includes first layer  71  subjected to the decoration process, plate-like member  110 , and second layer  72  for adjusting the light transmittance. First layer  71  and second layer  72  are formed by decorating the front side and the back side of plate-like member  110  by painting or printing. For example, in the usage environment illustrated in  FIG. 1 , first layer  71 , which is the front surface side directly seen from user  13 , is decorated more precisely, such as printing or painting, which imitates a real material. However, when such decoration is performed, it becomes difficult to control the light transmittance and displayed information on surface member  11  may blurred. Therefore, the side which is not directly visible from user  13 , that is, the back side of surface member  11  is also decorated by painting or printing. By providing the decorated layers on both surfaces in this manner, the blur and the light transmittance passing through surface member  11  and decorated first layer  71  and second layer can be controlled with a high degree of freedom. For example, in a case where a light-colored wood pattern is printed on first layer  71  on the front surface side of surface member  11 , the amount of light transmitted from the front surface side of the first layer to display device  20  side increases, and there is a possibility that the shape of display panel  23  is seen from the user. Here, by painting second layer  72  on the back side of surface member  11  with a relatively dark color ink, the amount of transmitted light can be adjusted to prevent display panel  23  from being seen through surface member  11 . Further, since surface member  11  is a transparent or translucent material, by decorating both surfaces of surface member  11 , the decorative expression seen from the front surface side can be deepened, and the authenticity can be further enhanced. On the other hand, when there is a distance between the surface member  11  and the display  23  as shown in  FIG. 47 , the information displayed on the surface of the surface member  11  is blurred. Therefore, an optical filter having a characteristic of transmitting light rays of high luminance and blocking light rays of low luminance is provided as the second layer  72 . As a result, as shown in  FIG. 48 , only light in the vertical direction with respect to the display  2  having relatively high brightness reaches the surface member  11 , and light emitted in other directions does not reach the surface member  11 . Thereby, the blurring of the information displayed on the surface member  11  can be suppressed. 
     First layer  71  and/or second layer  72  may be made of a film. 
     Second layer  72  having a light transmittance adjusting function may be formed by vapor deposition. Otherwise, the second layer may be formed by translucent solid printing. In this case, the printing may be performed by performing painting with black with a light transmittance of 40% to 60%. 
     First layer  71  is disposed to be in close contact with a part or the entirety of the front side of plate-like member  110 , and second layer  72  is disposed to be in close contact with a part or the entirety of the back side of plate-like member  110 . 
     The light transmittance of second layer  72  is preferably 40% to 60%. Otherwise, second layer  72  may be formed by a half mirror having a light transmittance of 40% to 70%. Alternatively, second layer  72  may be formed by an optical filter. In this case, for example, the optical filter is designed to transmit only light from display panel  23  and prevent transmission of external light. Alternatively, it is preferable that the optical filter has a characteristic of transmitting only the light having a luminance of 500 cd/m{circumflex over ( )}2 or more among the light arriving from the display panel  23  and blocking the light having a luminance less than that. 
     The combined light transmittance of first layer  71  and second layer  72  is preferably 8% to 15%. 
     The same effect can be realized even if the second layer  72  is disposed on the surface of the touch panel  37  (specifically, the surface of the cover glass of the touch panel) instead of the surface of the plate-like member  110 . When the second layer  72  is installed on the touch panel side, the plate-like member  110  needs only the first layer  71  to decorate the surface, and the surface treatment applied to the plate-like member  110  can be reduced. The choice of materials used for the layer  71  can be expanded. Display panel  23  is preferably adjusted by CPU  22  ( FIG. 1 ) such that the luminance on surface member  11  due to the light transmitted through surface member  11  is 200 cd/m{circumflex over ( )}2 or less. Preferably, display panel  23  is adjusted by CPU  22  ( FIG. 1 ) such that the luminance of the light source (not illustrated) at the time of being turned on is 800 cd/m{circumflex over ( )}2 or more. 
     With the above-described configuration, information display device  1 G adjusts the amount of light transmission of surface member  11  to prevent display panel  23  from being seen through surface member  11 , and to make the information displayed on surface member  11  comfortably seen from the user. 
     Desirable performances for the display and touch panel used in this embodiment are the same as those described in the first embodiment. 
     Modification Example 7-1 
       FIG. 30  illustrates information display device  1 G- 1  according to a modification example. In the example illustrated in  FIG. 29 , the decorative layers are provided on the front side and the back side of surface member  11 , but the method of realizing surface member  11  is not limited thereto. For example, the surface member is formed by decorative film  40  having the light transmitting properties disposed on the surface of a transparent plate having a sufficient rigidity, and the same effect can be obtained by performing the decoration process with respect to the both surfaces of decorative film  40 . 
       FIG. 30  is a schematic sectional view of information display device  1 G- 1 . Information display device  1 G- 1  includes decorative film  40  that is a transparent or translucent film member, light-transmitting plate  42  that is a plate-like member, cushion sheet  37 , touch panel  21 , display panel  23 , and housing  57 . Surface member  11  includes light-transmitting plate  42  for maintaining rigidity and decorative film  40  for realizing surface decoration. Decorative film includes first layer  71  and second layer  72 . The decoration process is performed on the front side of decorative film  40  to form first layer  71 , and the decoration process is performed on the back side of decorative film  40  to form second layer  72 . 
     First layer  71  is disposed to be in close contact with a part or the entirety of the front side of decorative film  40 . Second layer  72  is disposed to be in close contact with a part or the entirety of the back side of decorative film  40 . Decorative film  40  may be pasted to light-transmitting plate  42  with an adhesive. 
     With the above-described configuration, information display device  1 G- 1  can control the light transmittance and express the depth to the decorative expression, similar to the example illustrated in  FIG. 25 . 
     Modification Example 7-2 
     The second layer  72  in the seventh embodiment is configured to compensate variations in the transmittance of the first layer for each wavelength, which depends on the location. 
     In this example, compensate means do the treatment as below for example. While the first layer is configured with decorative design, the light transmittance of the first layer have variations depending on wavelengths and locations. In that case, if the second layer  72  performs uniform transmittance adjustment, the image displayed on the user side will be affected by the design of the first layer. In order to achieve the desired color without being influenced by the design of the first layer  71 , it can be achieved by compensating the variation for each wavelength on the second layer  72 . 
     Here, the term “compensating” means that for the position where the transmittance of the first layer  71  is high, the transmittance of the second layer  72  corresponding to that position across the surface member  11  is lowered, and at the same time, for the position where the transmittance of the first layer  71  is low, the transmittance of the second layer  72  corresponding to that portion across the surface member  11  is enhanced. 
     For example, the transmittance of the second layer  72  may be configured by changing the thickness of the material of the second layer  72  depending on the location, changing the material of the second layer  72  or the quantity of mixture such as ink depending on the location, or changing the color of the second layer  72  depending on the location. 
     With the above-described configuration, the attenuation rate through the second layer  72 , the surface member  11 , and the first layer  71  becomes uniform on the whole screen of an information display device. As images can be displayed with uniform brightness, visibility of information and design of the product are improved. 
     It is more effective if the compensation is configured independently for each of the three primary colors of light. 
     For ideal example, consider the case where the transmittance of a specific position of the first layer  71  is as follows for each of red light (R), green light (G), and blue light (B). 
     (R, G, B)=(20%, 10%, 80%) 
     In this case, the transmittance of the corresponding position of the second layer  72  may be set as follows so that the image appearing on the user side is displayed without shifting the original display color. 
     (R, G, B)=(50%, 100%, 12.5%) 
     The transmittance of the second layer  72  is determined so that the product of transmittance for each of the three primary colors of light of the first layer  71  and the second layer  72  is the same. 
     (R, G, B)=(20%*50%=10%, 10%*100%=10%, 80%*12.5%=10%) 
     By determining the transmittance for each of the three primary colors of light in the second layer  72  from the transmittance of the first layer  71  at the corresponding position by the above method, it is possible to suppress unevenness in brightness and color depending on the position of the display surface. 
     Without such configuration of transmittance of the second layer  72 , the brightness of each color used by the display device  20  must be driven in the following range with respect to the maximum brightness that the display device  20  can originally emit. 
     R: Min=0%, Max=50% 
     G: Min=0%, Max=100% 
     B: Min=0%, Max=12.5% 
     However, in this case, the display device must display an image of blue with a dynamic range of only 12.5% of the brightness that the display device can emit. In many displays, the brightness is designed to be set by digital gradation. So the gradation existing between the maximum brightness and the minimum brightness that can be used for blue is reduced. This fact makes it difficult to express a delicate color such as light blue. 
     The configuration of the transmittance of the second layer  72  described above solves such a problem. By changing the transmittance of the second layer  72  according to the design of the first layer  71 , the desired color can be displayed on the user side regardless of the design of the first layer  71 . 
     8. Embodiment 8 
       FIG. 31  illustrates a usage environment of information display device  1 H according to the embodiment. 
     In the usage environment in the embodiment, information display device  1 H is disposed on wall surface  10  in an aircraft or the like. Information display device  1 H displays information displayed on the display panel to be seen on display region  1   a  by transmitting the light of the display panel from the back side of surface member  11 . 
     Information display device  1 H is used in any usage environment similar to the above-described embodiment. The description of information display device  1 H having the same configuration and function as those of the above-described embodiments will be omitted, and the same reference numerals will be given to the same configuration members. 
     Information display device  1 H according to the embodiment is different from those in the above-described embodiments mainly in that reflectance variable reflection layer (half mirror layer)  120  capable of partially changing the light transmittance and the reflectance is provided. Normally, by adding a reflection layer between surface member  11  and display panel  23  of the information display device, appearance of transparency on the surface decoration layer of surface member  11  can be reduced, and the images on display region  1   a  can also be colored with an appropriate color. However, the reflection layer also reduces the light from the light source (display panel  23  or another light source) inside display device  20 . For example, when the reflectance of the reflection layer is 50%, the light transmittance is also 50%. Therefore, the light from display panel  23  to be displayed becomes darker, and the place not to be displayed becomes bright and prominent. For example, in a case where a liquid crystal display is used, there is a case where the light of the backlight is visible even on a dark screen. 
     In the embodiment, a reflection layer of which the light transmittance or the reflectance can be partially changed is provided. In the reflection layer, the light transmittance of only the location desired to be displayed from display panel  23  is increased, the light transmittance of the other locations (the locations where information is not displayed) is reduced to increase the reflectance, and accordingly, an information display device of which the real feeling of the decorative layer on surface member  11  is improved can be realized. 
     In addition, by increasing the light transmittance and lowering the reflectance for a certain region of the display, there is a case where the color of the background is different from the intended color of the surface decoration layer, and the color of the background is picked up and darkened, but at this time, display panel  23  emits light that corrects the amount of darkness caused by the increase in the transparency of the reflection layer with respect to the surface decoration layer, and accordingly, the unnaturalness can be eliminated. 
     Although display region  1   a  in which the light transmittance can be changed is expressed by a square in  FIG. 31 , the shape, the number, and the size of display region  1   a  are not limited. 
       FIG. 32  is a configuration view of a system for operating information display device  1 H according to the embodiment. CPU  22  causes display panel  23  to display necessary or useful information for user  13  based on the information from in-flight server  2 . CPU determines a region where the reflectance or the light transmittance of reflectance variable reflection layer  120  is changed based on the information to be displayed on display panel  23  and the ambient light information from ambient light sensor  28 , which are acquired from in-flight server  2 . CPU  22  also calculates the reflectance and/or the light transmittance based on the ambient light information from ambient light sensor  28 , and changes the reflectance or the light transmittance of reflectance variable reflection layer  120 . In addition, in a case where ambient conditions can be grasped without measuring, or in a case where ambient light conditions may not be considered, an ambient light sensor may not be provided. In this case, CPU  22  controls reflectance variable reflection layer  120  based on predetermined reference information (for example, the luminance of display panel  23 ). 
       FIG. 33  is a schematic sectional view of information display device  1 H of the embodiment. Information display device  1 H includes surface member  11 , reflectance variable reflection layer (half mirror)  120 , and display panel  23 . Light from display panel  23  is transmitted through reflectance variable reflection layer  120  and displays information on display region  1   a  of surface member  11 . 
     Information display device  1 H according to the embodiment can enhance the effect of decoration such as a real feeling other than the location on surface member  11  where information is displayed, and can improve the light transmittance of the location where information is displayed on display panel  23 . 
     Desirable performances for the display and touch panel used in this embodiment are the same as those described in the first embodiment. 
     9. Embodiment 9 
       FIG. 34  illustrates a usage environment of information display device  1 I according to the embodiment. 
     In the usage environment in the embodiment, information display device  1 I is disposed on wall surface  10  in an aircraft or the like. Information display device  1  performs display such that user  13  can see the display in display region  1   a  by transmitting the light of the display panel from the back side of surface member  11 . 
     Information display device  1 I is used in any usage environment similar to the above-described embodiment. The description of information display device  1 I having the same configuration and function as those of the above-described embodiments will be omitted, and the same reference numerals will be given to the same configuration members. 
     Information display device  1 I is different from those of the above-described embodiment in that reflection layer (half mirror layer)  121  that can selectively transmit the light from display panel  23  is provided. With such a configuration, the light from display panel  23  can be selectively transmitted. Reflection layer  121  transmits only light desired to be displayed from display panel  23 , does not transmit other light, and accordingly, it is possible to prevent unnecessary display and light leakage, and to enhance the real feeling of the surface decoration layer of surface member  11 . 
       FIG. 35  is a configuration view of a system for operating information display device  1 I according to the embodiment. CPU  22  calculates the wavelength of light that is easily transmitted through reflection layer  121  based on information from in-flight server  2 , and causes display panel  23  to display the light. Reflection layer  121  that can selectively transmit the light may have a role of a filter that converts the wavelength of the light and transmits the light. By doing so, it is considered that the expression of colors with better color development becomes possible. 
       FIG. 36  is a schematic sectional view of information display device  1 I of the embodiment. Information display device  1 I includes surface member  11 , reflection layer (half mirror)  121  for selectively transmitting light, and display panel  23 , the light from display panel  23  is transmitted through reflection layer  121 , and the information is presented to the user through display region  1   a  on surface member  11 . 
     With the above-described configuration and operation, information display device  1 I of the embodiment has an effect of reducing elements that deteriorate the real feeling at locations other than the locations where information is displayed by the light of the backlight of display panel  23  or the like. Furthermore, a location to be displayed on display panel  23  can be clearly displayed. Desirable performances for the display and touch panel used in this embodiment are the same as those described in the first embodiment. 
     10. Embodiment 10 
       FIG. 37  illustrates a usage environment of information display device  1 J according to the embodiment. 
     In the usage environment in the embodiment, information display device  1 J is disposed on partition  41  which is a part of the interior of the aircraft. Partition  41  partitions a space in the aircraft, such as a wall that separates the personal space of passengers from a passage where crews walk, and a wall of a shell seat. Partition has surface  41   a  and surface  41   b  opposite to surface  41   a . Information display device  1 J according to the embodiment is different from those of the above-described embodiments mainly in that information display device  1 J is disposed so as to provide display regions  1   a  and  1   b  on both surfaces of partition  41 . 
     Information display device  1 J is used in any usage environment similar to those of the above-described embodiments as long as information display device  1 J is a plate-like structure such as partition  41  and has a structure that is open on both sides. For example, the structure is disposed on a wall, a door of a container, or a seat disposed in an aircraft, that is, at a position visible from a passenger or a crew of the moving object. As illustrated in the example illustrated in  FIG. 9 , information display device  1 J may be disposed on wall surface  94  of the cabin wall of the seat compartment, the information mainly toward crew  93  such as a cabin crew may be displayed on the display surface on the passage side of the wall surface  94 , and the information toward the passenger may be displayed on the display surface on the seat side opposite to the wall surface  94 . The description of information display device  1 J having the same configuration and function as those of the above-described embodiments will be omitted, and the same reference numerals will be given to the same configuration members. 
     As illustrated in  FIG. 38 , information display device  1 J is installed in partition  41  of which the upper part is curved. As illustrated in the exploded perspective view of  FIG. 39 , structural body  410  that serves as the basis of partition  41  is a plate-like structure having a curved upper part, recess  410   a  is formed by depressing a part of the upper part, and plate-like body  43  is formed on recess  410   a . Display panel  23  is attached to be over plate-like body  43  in recess  410   a . Surface member  11  is attached so as to cover display panel  23  and structural body  410 . 
       FIG. 40  is a schematic sectional view of information display device  1 J. Information display device  1 J includes plate-like body  43  which is a part of structural body  410 , display panel  23 , and surface member  11 . Plate-like body  43  has first attaching surface  43   a , second attaching surface  43   b  opposite to first attaching surface  43   a , and side portion  43   c  that connects first attaching surface  43   a  and second attaching surface  43   b  to each other. 
     Display panel  23  is, for example, an OLED (Organic Light Emitting Diode) display or the like, and is a flexible display device that can be bent. Display panel  23  has first display surface  23   a  via curved portion  23   c , and second display surface  23   b  opposite to first display surface  23   a . Display panel  23  is attached onto plate-like body  43  such that first display surface  23   a  covers first attaching surface  43   a , second display surface  23   b  covers second attaching surface  43   b , and curved portion  23   c  covers side portion  43   c . Display panel  23  can display different information on first display surface  23   a  and second display surface  23   b.    
     Display panel  23  disposed on plate-like body  43  in recess  410   a  may have a thickness that does not protrude to the outside of recess  410   a , that is, does not protrude from the outer surface of the other parts of structural body  410 . In other words, the vertical and horizontal length and thickness of display panel  23  are configured to substantially match the vertical and horizontal length and depth of recess  410   a . Accordingly, the surface of structural body  410  other than the part where recess  410   a  is formed can be substantially flush with the display surface of display panel  23 . 
     Surface member  11  has a surface area larger than that of display panel  23 , and is pasted so as to cover recess  410   a  to which display panel  23  is attached and the other parts of structural body  410 . 
     Information display device  1 J according to the embodiment has high designability by realizing information display in a seamless region having no boundary with a wall surface, and additionally, can perform various information presentations efficiently by disposing the display regions on both sides of the wall. Furthermore, since the information is displayed on both sides of the wall with one information display device, the number of components and the complexity of wiring can be reduced. 
     In the above embodiment, as shown in  FIGS. 39 and 40 , the upper portion of the side portion  43   c  of the plate-like body  43  has a approximately right-angled shape. Instead of this right-angled shape, it may be the curved shape along with the curved portion  23   c  of the display panel  23  (or It maybe a rounded shape on the corners). Thereby, the load generated when the display panel  23  is attached can be reduced. 
     Modification Example 10-1 
     Between display panel  23  and surface member  11 , a transparent or translucent member (not illustrated) disposed to cover the display surface of display panel  23  may be disposed. 
     The transparent or translucent member is, for example, a laminated film. The laminated film has such characteristics that, while having the light transmitting properties, the presence of the internal configuration (display panel  23  or recess  410   a ) on the back side of surface member  11  is not visible when viewed from the line of sight of user  13  ( FIG. 37 ). The laminated film is pasted with an adhesive or the like so as to cover structural body  410  and display panel  23  before surface member  11  is disposed. With the configuration, light emitted from display panel  23  can be projected on surface member  11  through the laminated film. Accordingly, when the information is not displayed, only the information displayed in a region that is not different from the surrounding wall surface can be made to emerge, and accordingly, extremely high designability can be realized. 
     Since the outer surface of the other parts of structural body  410  other than recess  410   a  and the display surface of display panel  23  are substantially flat, the operation of pasting the laminated film becomes easy. Accordingly, the steps required for manufacturing information display device  1 J become simple. Further, the laminated film is sufficient when the film has a certain degree of light transmitting properties and does not require any special characteristics, and thus, a film generally used as a building material can be used. For example, even in an environment with strict fire prevention standards such as in an aircraft, wallpaper that has already been used in such an environment can often be used as it is. 
     The transparent or translucent member may be provided only on display panel  23  in recess  410   a . In this case, the transparent or translucent member is attached such that the front surface is flush with, or at least protrudes from, the outer surface of the other parts of structural body  410  other than recess  410   a . In other words, the depth of recess  410   a  is a size obtained by adding the thickness of display panel  23  and the thickness of the transparent or translucent member. 
     Modification Example 10-2 
     Partition  41  may not have the upper curved portion. For example, as illustrated in  FIG. 41 , structural body  410  which is the basis of partition  41  has a rectangular upper portion. In structural body  410 , recess  410   a  is formed by depressing a part of the upper portion similar to the example illustrated in  FIG. 39 , and plate-like body  43  is formed in recess  410   a . As illustrated in  FIG. 42 , display panel  23  is attached to be over plate-like body  43  in recess  410   a . Display panel  23  is bent and disposed in a rectangular shape according to the shape of the upper portion of structural body  410  in which recess  410   a  is formed. As illustrated in  FIG. 43 , surface member  11  is attached so as to cover display panel  23  and structural body  410 . 
     In addition, similar to the above-described example, the vertical and horizontal length and thickness of display panel  23  are configured to substantially match the vertical and horizontal length and depth of recess  410   a . Further, display panel  23  may be formed to have a thickness that does not protrude from the outside of recess  410   a , that is, does not protrude from the outer surface of the other parts of structural body  410 . Similar to the above-described example, between display panel  23  and surface member  11 , a transparent or translucent member (not illustrated) disposed to cover at least the display surface of display panel  23  may be disposed. 
     In the above embodiment, as shown in  FIG. 41 . the side portion  43   c  of the plate body  43  may be formed in a curved shape (or a rounded shape on the corners). With such a configuration, even if the upper portion of the display panel  23  has a right-angled shape, the load generated when the display panel  23  is attached can be reduced. 
     Modification Example 10-3 
     The surface member  11  does not have to be arranged on both sides of the structure  410 . For example, the front surface member  11  may be arranged on each of the front and back surfaces, the side surfaces, and the top surface of the structure  410  such as a wall. In that case, the surface member  11  on each surface of the structure  410  may be made of different materials. For example, a part or all of the surface member  11  that covers the first mounting surface  43   a , the surface member  11  that covers the second mounting surface  43   b , and the surface member  11  that covers the side portion  43   c  of the plate body  43  are made of different materials or patterns. 
     11. Other Embodiments 
     (1) 
     Information display devices  1  to  1 J may determine the in-flight conditions (meal time, sleep time, before and after takeoff and landing, operation in turbulence, and the like) based on information from a connected in-flight server (not illustrated), and change the contents to be displayed. Since the information is displayed on the wall surface, it is possible to realize an information display device which can perform display without damaging the sense of luxury even when the display contents and the display amount are changed and the region that is not displayed is changed. 
     Similar to the example illustrated in  FIG. 2 , information display devices  1  to  1 J include touch panel  21 , CPU  22 , and display panel  23 . CPU  22  selects information to be presented to user  13  ( FIG. 1 ) based on information from the in-flight server, and displays optimal information. 
     According to the above-described operation, in the embodiment, it becomes possible to realize an information display device that can provide information optimal for the user in accordance with the in-flight conditions without damaging the sense of luxury. 
     In the embodiment, a case where the in-flight conditions are acquired from the in-flight server is employed as an example, but the in-flight conditions may be determined by CPU  22  from a clock built in the information display device, a sensor that detects inclination or vibration, and the like. Further, in a case where there are a plurality of information display devices in the cabin, an optimal information display device may be selected in accordance with the in-flight conditions. For example, when the passenger is eating, an information display device at a position that can be easily seen from the dining table may be selected to display the information. 
     (2) 
     Information display devices  1  to  1 J may determine the information from the in-flight environment sensor and change the contents to be displayed based on the in-flight environment (temperature, humidity, illuminance, air pressure, and the like). Since the information is displayed on the wall surface, it is possible to realize an information display device which can perform display without damaging the sense of luxury even when the display contents and the display amount are changed and the region that is not displayed is changed. 
     Similar to the example illustrated in  FIG. 2 , information display devices  1  to  1 J include touch panel  21 , CPU  22 , and display panel  23 . CPU  22  selects information to be presented to user  13  ( FIG. 1 ) based on information from the plurality of sensors (not illustrated) which are disposed in the cabin, and displays optimal information. For example, a button for requesting a blanket is displayed when the temperature drops. Accordingly, it is possible to select information to be presented to user  13  ( FIG. 1 ), and to display optimal information. 
     According to the above-described operation, in the embodiment, it becomes possible to realize an information display device that can provide information optimal for the user in accordance with the in-flight environment without damaging the sense of luxury. 
     In the embodiment, a case where the in-flight environment is acquired from the in-flight environment sensor is employed as an example, but the in-flight environment may be determined from a clock or the like built in the in-flight server or the information display device. Further, in a case where there are a plurality of information display devices in the cabin, an optimal information display device may be selected in accordance with the in-flight conditions. 
     (3) 
       FIG. 44  illustrates a usage aspect of information display device  1 K according to the embodiment. 
     In the usage environment in the embodiment, information display device  1 K is disposed on wall surface  10  which is a part of the interior of the aircraft. Information display device  1 K transmits the light of the display panel from the back side of surface member  11  and displays information in display region  1   a  on surface member  11  such that user  13  can be seen. Information display device  1 K is characterized in that a film having a designability and light transmitting properties is pasted to the front of the display device, and that the pattern of the film having a designability is the same pattern as that of the wall surface around the display device. 
     Information display device  1 K is used in any usage environment similar to the above-described embodiment. The description of information display device  1 K having the same configuration and function as those of the above-described embodiments will be omitted, and the same reference numerals will be given to the same configuration members. 
       FIG. 45  is a schematic sectional view of information display device  1 K of the embodiment. Information display device  1 K includes surface member  11   a , reflection member (half mirror)  12 , structural body  54 , touch panel  21 , display panel  23 , wall surface member  11   b , and void  154 . Void  154  is formed between surface member  11   a  and wall surface member  11   b , and is formed so as to surround the outer edge of display panel  23 . The front side of surface member  11   a  and the front side of wall surface member  11   b  are decorated with the same pattern. As illustrated in  FIG. 45 , surface member  11   a  and reflection member  12  are disposed on the bottom surface of void  154 . Accordingly, the boundary between wall surface member  11   b  and surface member  11   a  can be made prominent. The member to be pasted to the bottom surface of void  154  may be wall surface member  11   b.    
     In order to realize an information display device in which display region  1   a  and other parts can be seen seamlessly, it is preferable that void  154  is not present. However, by providing void  154 , during the maintenance, only surface member  11   a  can be detached from wall surface  10  and only display panel  23  or touch panel  21  can be picked up. 
     It is preferable that void  154  has a width that does not hinder removal. For example, when the void has a width of approximately 0.5 mm to 2 mm, it is considered that both aesthetic appearance and practicality can be achieved. 
     With the above-described configuration, information display device  1 K according to the embodiment does not allow user  13  to feel the position and the presence of display panel  23 , can detach and replace only the display panel  23  without peeling off the entire wall in the event of a failure. Accordingly, information display device  1 K can make the maintenance simple while realizing a seamless design in which the joints are not visually prominent. 
     (4) 
     In the above-described embodiment, the surface member  11  may include a transparent member, even if not particularly described. In this case, the transparent member may have same configuration and function as the transparent member  53  of the third embodiment and the like. 
     (5) 
     In the above-described embodiment, a part or the entirety of processing of each functional block may be realized by a program. A part or the entirety of processing of each functional block may be executed by a processor in a computer. A program for performing each processing may be stored in a storage device such as a hard disk or a ROM, and may be read and executed on the ROM or the RAM. 
     In the above-described embodiment, a processor formed by a dedicated electronic circuit designed to realize a predetermined function may be included instead of the CPU. Further, instead of the CPU, the functions may be realized by various processors such as an MPU, a GPU, a DSP, an FPGA, and an ASIC. The processor may be formed by one or more processors. 
     In the above-described embodiment, an example has been described in which information display devices  1  to  1 J are installed in the aircraft. However, the disclosure is not limited thereto. The location where information display devices  1  to  1 J are installed may be other moving objects or vehicles such as trains, buses, ships, and the like. 
     As described above, the above-described embodiments have been described as an example of the technology disclosed in the application. However, the technology in the disclosure is not limited thereto, and can be applied to embodiments in which changes, replacements, additions, omissions, and the like are appropriately made. Further, it is also possible to achieve a new embodiment by combining each configuration elements described in the above-described embodiments. 
     REFERENCE NUMERALS 
       1 - 1 K: Information Display Device,  2 : In-flight Server,  11 , 11   a : Surface Member,  11   b : Wall Surface Member,  12 : Reflection Member,  13 : User,  20 : Display Device,  21 : Touch Panel,  22 : CPU,  23 : Display Panel,  23   a : first Display Surface,  23   b : Second Display Surface,  23   c : Curved Portion,  26 : Seat Monitor,  28 : Ambient Light Sensor,  32 : Slight-Adhesive Layer,  33 : Reflection Layer,  35 : Structural Body,  37 : Cushion Sheet,  38 : Fixing Member,  40 : Decorative Film,  41 : Partition,  41   a : Surface,  41   b : Surface,  42 : Light-transmitting Plate,  43 : Plate-like Body,  43   a : First Mounting Surface,  43   b : Second Mounting Surface,  43   c : Side Portion,  53 : Transparent Member,  54 : Structural Body,  55 : Space,  57 : Housing,  58 : Film,  59 : Film,  60 : Base Member,  61 : Ceiling,  71 : First Layer,  72 : Second Layer,  82 : transparent Member,  83 : Mask Print Layer,  83   a : Outer Edge,  83   b : Inner Edge,  85 : Reflection Layer,  93 : Crew,  94 : Wall Surface,  100 : Structure,  100   a : Structural Body,  101 : Seat,  105   a : Retainer,  105   b : Retainer,  106 : Screw,  110 : Plate-like Member,  120 : Reflectance Variable Reflection Layer,  121 : Reflection Layer,  122 : Door Surface,  154 : Void,  231 : Display Surface,  410 : Structural Body,  410   a : Recess 
     PRIOR ART 
     Patent Document 1: JP2012-118513