Patent Publication Number: US-2021165242-A1

Title: Information display device and information display system

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority to Japanese Patent Application No. 2018-121272, which was filed on Jun. 26, 2018, the contents of which are incorporated herein by reference in its entirety. 
     TECHNICAL FIELD 
     The present disclosure relates to an information display device and an information display system. 
     BACKGROUND ART 
     In the related art, a device that displays an image while the background is transmitted is known. This technique is described in, for example, Japanese Unexamined Patent Publication JP-A 2012-506604. 
     SUMMARY OF INVENTION 
     According to one embodiment of the disclosure, an information display device includes a light emitting panel, a shutter panel, and a controller. The light emitting panel includes a plurality of transmitting portions configured to transmit first light and a plurality of light emitting portions configured to emit second light. The light emitting panel is configured so that the transmitting portions and the light emitting portions are alternately arranged along a predetermined direction including a component in a direction in which a first eye and a second eye of a user are arranged. The shutter panel is configured to be positioned to be overlapped with the light emitting panel and includes a dimming region which is capable of operating so that the first light and the second light are reduced. The controller is capable of controlling the dimming region so that the first light enters the first eye and the second light enters the second eye. 
     According to one embodiment of the disclosure, an information display system includes an information display device and a camera. The information display device includes a light emitting panel, a shutter panel, an acquisition unit, and a controller. The light emitting panel includes a plurality of transmitting portions configured to transmit first light and a plurality of light emitting portions configured to emit second light. The light emitting panel is configured so that the transmitting portions and the light emitting portions are alternately arranged along a predetermined direction including a component in a direction in which a first eye and a second eye of a user are arranged. The shutter panel is configured to be positioned to be overlapped with the light emitting panel and includes a dimming region which is capable of operating so that the first light and the second light are reduced. The acquisition unit is configured to acquire first position information relating to a position of the first eye and second position information relating to a position of the second eye. The controller is capable of controlling the dimming region so that the first light enters the first eye and the second light enters the second eye. The camera is capable of operating to output the first position information and the second position information to the acquisition unit. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a block diagram illustrating a configuration example of an information display system according to one embodiment; 
         FIG. 2  is a plan view illustrating a configuration example of an information display device according to one embodiment; 
         FIG. 3  is a cross-sectional view taken along the line A-A of  FIG. 2 ; 
         FIG. 4  is a diagram illustrating an example of configurations of a light emitting panel and a shutter panel; and 
         FIG. 5  is a diagram illustrating another example of configurations of the light emitting panel and the shutter panel. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     As illustrated in  FIG. 1 , an information display system  100  according to an embodiment includes an information display device  1  and a camera  2 . The information display device  1  includes a light emitting panel  10 , a shutter panel  20 , and a controller  30 . The information display device  1  may further include an acquisition unit  40 . The acquisition unit  40  may be connected to the camera  2 . In case of being connected to the camera  2 , the acquisition unit  40  can acquire information from the camera  2 . 
     The controller  30  is connected to each component of the information display device  1  and controls each component. For example, the controller  30  is configured as a processor. The controller  30  may include one or more processors. The processor may include a general-purpose processor that reads a specific program and executes a specific function, and a dedicated processor specialized for a specific process. The dedicated processor may include an application specific integrated circuit (ASIC). The processor may include a programmable logic device (PLD). The PLD may include a field-programmable gate array (FPGA). The controller  30  may be any one of a system-on-a-chip (SoC) and a system-in-a-package (SiP) in which one or a plurality of processors cooperate. The controller  30  includes a storage unit, and the storage unit may store various kinds of information, programs for operating each component of the information display device  1 , and the like. The storage unit may be configured, for example, with a semiconductor memory. The storage unit may function as a work memory of the controller  30 . 
     As illustrated in  FIGS. 2 and 3 , the light emitting panel  10  includes a plurality of transmitting portions  12  and a plurality of light emitting portions  14 . The transmitting portions  12  are configured to transmit light incident from a background toward the light emitting panel  10  when seen from a user. The transmitting portions  12  are configured to transmit light incident from the background positioned on a side in a negative direction of the Z axis toward a left eye  5 L and a right eye  5 R of the user that are positioned on a side in a positive direction of the Z axis. The light incident from the background is also referred to as first light. In  FIG. 3 , the first light advances in a direction from the light emitting panel  10  to the left eye  5 L and the right eye  5 R of the user as illustrated with alternate long and short dash lines with arrows. The first light that transmits the transmitting portions  12  enters the eyes of the user, so that the user can visually recognize the background on a side toward the light emitting panel  10 . The transmitting portions  12  may have a transmittance of a predetermined value or more. The transmitting portions  12  may include, for example, glass or a resin. 
     The light emitting portions  14  are configured to emit light for forming an image toward the left eye  5 L and the right eye  5 R of the user that are positioned on the side in the positive direction of the Z axis. The light for forming the image is also referred to as image light or second light. In  FIG. 3 , the second light advances in a direction from the light emitting panel  10  toward the left eye  5 L and the right eye  5 R of the user as illustrated with broken lines with arrows. The light emitting portions  14  cause the second light to enter the right eye  5 R and the left eye  5 L of the user. The second light enters the eyes, so that the user can visually recognize an image. The light emitting portions  14  may be an organic light emitting diode (OLED). The OLED may be a device that emits light by using an organic electro-luminescence (EL) phenomenon. In the case where the light emitting portions  14  are an OLED, the light emitting panel  10  including the transmitting portions  12  is also referred to as a transparent OLED. The light emitting portions  14  may include a self-luminous device such as an inorganic EL. 
     As illustrated in  FIG. 3 , the shutter panel  20  is configured to be overlapped with the light emitting panel  10  and positioned between the right eye  5 R and the left eye  5 L of the user and the light emitting panel  10 . As illustrated in  FIGS. 2 and 3 , the shutter panel  20  includes a plurality of light transmitting regions  21  and a plurality of dimming regions  22 . The light transmitting regions  21  can be operated to transmit the first light and the second light incident from the light emitting panel  10  side. The first light and the second light pass through the light transmitting regions  21  and reach the right eye  5 R and the left eye  5 L of the user. The dimming regions  22  can be operated to reduce the first light and the second light incident from the light emitting panel  10  side. The shutter panel  20  includes a plurality of elements that transition between a light transmitting state and a dimming state. The shutter panel  20  may be a liquid crystal shutter. The liquid crystal shutter can control the transmittance of the light according to the applied voltage. The liquid crystal shutter may be configured with a plurality of pixels and control the transmittance of the light in each pixel. The liquid crystal shutter can form a region with a high light transmittance and a region with a low light transmittance into any shapes. In the case where the shutter panel  20  is configured with a liquid crystal shutter, the light transmitting region  21  may be a region having the transmittance with a first predetermined value or more. For example, the first predetermined value may be 100% or may be a value close to 100%. In the case where the shutter panel  20  is configured with a liquid crystal shutter, the dimming region  22  may be a region having the transmittance of the second predetermined value or less. For example, the second predetermined value may be 0% or may be a value close to 0%. In the case where the first predetermined value is in a range in which a sufficient contrast with the light passing through the dimming regions  22  can be secured, the first predetermined value may be a value less than 50%, for example, 10%. In the case where the second predetermined value is in a range in which a sufficient contrast with the light passing through the light transmitting regions  21  can be secured, the second predetermined value may be a value more than about 0%, for example, 10%. The value of the sufficient contrast may be, for example, 100:1. The shutter panel  20  may be a MEMS panel in which a Micro Electro Mechanical System (MEMS) shutter is employed. 
     In the case where the user looks at the light emitting panel  10  via the shutter panel  20 , the light emitting panel  10  includes regions visually recognized by the user via the light transmitting regions  21  and regions that are not or hardly visually recognized by the user due to the reduction of light by the dimming regions  22 . The regions visually recognized by the user via the light transmitting regions  21  are also referred to as visible regions. The regions that are not or hardly visually recognized by the user due to the reduction of light by the dimming regions  22  are also referred to as non-visible regions. In the case where the visible regions include the transmitting portions  12 , the user can visually recognize the first light emitted from portions included in the visible regions among the transmitting portions  12 . In the case where the visible regions include the light emitting portions  14 , the user can visually recognize the second light emitted from the portions included in the visible regions among the light emitting portions  14 . 
     As exemplified in  FIG. 4 , each of the left eye  5 L and the right eye  5 R of the user visually recognizes a portion of the light emitting panel  10  and does not visually recognize or hardly visually recognizes the other portion of the light emitting panel  10 . The region visually recognized by the left eye  5 L of the user is also referred to as a left eye visible region  16 L. The region visually recognized by the right eye  5 R of the user is also referred to as a right eye visible region  16 R. The left eye visible region  16 L and the right eye visible region  16 R can be different from each other. The region that is not or hardly visually recognized by the left eye  5 L of the user is also referred to as a left eye non-visible region  17 L. The region that is not or hardly visually recognized by the right eye  5 R of the user is also referred to as a right eye non-visible region  17 R. The left eye non-visible region  17 L and the right eye non-visible region  17 R can be different from each other. 
     One eye of the left eye  5 L and the right eye  5 R of the user is also referred to as a first eye. The other eye is also referred to as a second eye. The first eye is different from the second eye. The regions visually recognized by each of the first eye and the second eye are referred to as a first visible region and a second visible region. The regions that are not or hardly visually recognized by each of the first eye and the second eye are also referred to as the first non-visible region and the second non-visible region. For example, in the case where the first eye is the left eye  5 L, the first visible region corresponds to the left eye visible region  16 L. 
     In the present embodiment, the first eye and the second eye are arranged along the X axis direction. In the present embodiment, each of the light transmitting regions  21  and the dimming regions  22  has a band-like shape extending in the Y axis direction, and these regions are alternately arranged along the X axis direction. That is, the end line of the light transmitting region  21  is a straight line or a line segment extending along the Y axis direction. In the example of  FIG. 4 , the direction in which the light transmitting regions  21  and the dimming regions  22  are alternately arranged is identical to the direction in which the first eye and the second eye are arranged. 
     The end line of the light transmitting region  21  may also extend in a direction inclined at a predetermined angle with respect to the Y axis direction. The predetermined angle is an angle larger than 0 degrees and an angle smaller than 90 degrees. In this case, the direction in which the end line of the light transmitting region  21  extends intersects the direction in which the first eye and the second eye are arranged. In other words, the light transmitting regions  21  and the dimming regions  22  are configured to be alternately arranged in a predetermined direction including a component in the direction in which the first eye and the second eye of the user are arranged. 
     In the case where the direction in which the end line of the light transmitting region  21  extends intersects the direction in which the first eye and the second eye are arranged, the first visible region and the second visible region are not overlapped with each other in at least a portion thereof. In the information display device  1  according to the present embodiment, the direction in which the end line of the light transmitting region  21  extends intersects the direction in which the first eye and the second eye are arranged, so that the first visible region and the second visible region can be different from each other. In this case, the information display device  1  causes the first light passing through the transmitting portion  12  to reach the first eye of the user so that the background can be visually recognized, and causes the second light emitted from the light emitting portion  14  to reach the second eye so that the image can be visually recognized. By causing the light emitted from different distances to enter the first eye and the second eye, the user can focus on the light entering each of the first eye and the second eye. As a result, the user can visually recognize both of the background and the image. 
     As a comparative example, in the case where the direction extending to the end line of the light transmitting region  21  is identical to the direction in which the first eye and the second eye are arranged, the entire or large portions of the first visible region and the second visible region are overlapped with each other. As a result, both of the first light passing through the transmitting portions  12  and the second light passing through the light emitting portions  14  enter each of the first eye and the second eye of the user. In the case where both of the first light and the second light enter one eye, the user is hard to focus on the both of the light simultaneously. Accordingly, even if both of the first light and the second light enter one eye, it is difficult to visually recognize both of the background and the image with one eye. 
     In the case where the light transmitting region  21  and the dimming region  22  are arranged along the X axis direction, the left eye visible region  16 L and the left eye non-visible region  17 L are separated by a boundary and are alternately arranged in the X axis direction. The right eye visible region  16 R and the right eye non-visible region  17 R are separated by a boundary and are alternately arranged in the X axis direction. The position of the boundary is determined based on the position of the end line of the light transmitting region  21 , a distance between the eyes of the user and the shutter panel  20 , and a distance between the light emitting panel  10  and the shutter panel  20 . The distance between the shutter panel  20  and the eyes of the user is also referred to as an observation distance and illustrated as P in  FIG. 4 . The distance between the light emitting panel  10  and the shutter panel  20  is also referred to as a gap and illustrated as g in  FIG. 4 . 
     The positions of the left eye visible region  16 L and the right eye visible region  16 R are determined based on not only the observation distance (P) and the gap (g) but also the positions of the left eye  5 L and the right eye  5 R of the user. In other words, the positional relationship between the left eye visible region  16 L and the right eye visible region  16 R are based on not only the observation distance (P) and the gap (g) but also the distance between the left eye  5 L and the right eye  5 R of the user. The distance between the left eye  5 L and the right eye  5 R of the user is referred to as an inter-eye distance and illustrated as E in  FIG. 4 . 
     In the case where the left eye visible region  16 L is included in the right eye non-visible region  17 R, the left eye visible region  16 L is visually recognized by the left eye  5 L of the user but is not or hardly visually recognized by the right eye  5 R of the user. In the case where the right eye visible region  16 R is included in the left eye non-visible region  17 L, the right eye visible region  16 R is visually recognized by the right eye  5 R of the user but is not or hardly visually recognized by the left eye  5 L of the user. In the case where the left eye visible region  16 L is included in the right eye non-visible region  17 R, and the right eye visible region  16 R is included in the left eye non-visible region  17 L, it can be said that the left eye visible region  16 L and the right eye visible region  16 R are not overlapped with each other. In the example of  FIG. 4 , the left eye visible region  16 L and the right eye visible region  16 R are not overlapped with each other. 
     In the example of  FIG. 4 , the left eye visible region  16 L and the right eye non-visible region  17 R are identical to each other, and the right eye visible region  16 R and the left eye non-visible region  17 L are identical to each other. In other words, the left eye visible region  16 L and the right eye visible region  16 R are adjacent to each other. Further, the left eye visible region  16 L and the right eye visible region  16 R are respectively identical to the region of the light emitting portion  14  and the region of the transmitting portion  12 . In this case, the user only visually recognizes the light emitting portion  14  by the left eye  5 L and only visually recognizes the transmitting portion  12  by the right eye  5 R. 
     The controller  30  can control the position or shape of each of the light transmitting region  21  and the dimming region  22  of the shutter panel  20 . That is, the controller  30  can control the position or shape of the end line of the light transmitting region  21 . The controller  30  can control the position or shape of the light transmitting region  21  or the position or shape of the end line of the light transmitting region  21  by controlling the position or the shape of the dimming region  22 . The controller  30  can control the position or shape of each of the visible region and the non-visible region by controlling the position or shape of each of the light transmitting region  21  and the dimming region  22 . 
     The controller  30  can cause the left eye visible region  16 L and the right eye non-visible region  17 R to be identical to each other and also can cause the right eye visible region  16 R and the left eye non-visible region  17 L to be identical to each other by controlling the position or the shape of each of the light transmitting region  21  and the dimming region  22 . The position and shape of each of the transmitting portion  12  and the light emitting portion  14  in the light emitting panel  10  are fixed. That is, the controller  30  cannot control the shape and position of each of the transmitting portion  12  and the light emitting portion  14 . The controller  30  may control the dimming region  22  of the shutter panel  20  based on the shape and position of each of the transmitting portion  12  and the light emitting portion  14 . 
     In the case where the observation distance (P) is the predetermined distance, it is assumed that the controller  30  enables the left eye visible region  16 L and the right eye visible region  16 R to be identical to the region of the light emitting portion  14  and the region of the transmitting portion  12 . The predetermined distance in this case is also referred to as an optimal viewing distance (OVD). In the case where the observation distance (P) is different from the OVD, the controller  30  may not be able to enable the left eye visible region  16 L and the right eye visible region  16 R to be identical to the region of the light emitting portion  14  and the region of the transmitting portion  12  in some cases. Even if the controller  30  controls the position or shape of each of the light transmitting region  21  and the dimming region  22 , the visible region may not be identical to the region of the transmitting portion  12  or the region of the light emitting portion  14 . 
     In the case where the observation distance (P) is different from the OVD, the controller  30  may control the dimming region  22  of the shutter panel  20  so that the second light does not enter the first eye. For example, as illustrated in  FIG. 5 , the controller  30  may include the light emitting portion  14  in the right eye non-visible region  17 R so that the second light does not enter the right eye  5 R. In this manner, the first light and the second light do not simultaneously enter the first eye of the user. As a result, the user only needs to focus on the first light with the first eye, which makes it easier to visually recognize the background. 
     In the case where the first light and the second light simultaneously enter one eye, in view of the fact that the second light is emitted from the position closer than the first light, and the brightness of the second light can be higher than the brightness of the first light, it can be said that the eye makes it easier to focus on the second light. That is, even if the first light and the second light enter the second eye, the user can visually recognize the image by the second eye. Accordingly, the controller  30  may control the dimming region  22  of the shutter panel  20  so that at least a portion of the first light enters the second eye. For example, as illustrated in  FIG. 5 , the controller  30  may cause the left eye visible region  16 L to include the transmitting portion  12  and the light emitting portion  14  so that the first light and the second light enter the left eye  5 L. In this manner, the proportion of the light transmitting regions  21  of the shutter panel  20  can be great, and also the restriction on the position or shape of the dimming region  22  can be reduced. 
     The controller  30  may control the dimming region  22  of the shutter panel  20  based on the shape and position of the light emitting portion  14  in the light emitting panel  10 . That is, the controller  30  may control the position of the dimming region  22  in the shutter panel  20 , based on a second light emitting position in the light emitting panel  10  so that the second light does not enter the first eye. The controller  30  may control an area where the dimming regions  22  expand in the shutter panel  20 , based on a second light emitting region in the light emitting panel  10 . 
     In the light emitting panel  10 , an area occupied by the light emitting portions  14  may be equal to or less than an area occupied by the transmitting portions  12 . That is, a proportion of the area occupied by the light emitting portions  14  with respect to an area of the entire light emitting panel  10  may be 50% or less. In the case where the proportion of the area occupied by the light emitting portions  14  is 50% or less, the information display device  1  easily controls the dimming region  22  of the shutter panel  20  so that the second light emitted from the light emitting portions  14  enters the second eye and does not enter the first eye. In this case, a proportion of an area occupied by the light transmitting regions  21  in shutter panel  20  can be expanded. The information display device  1  can increase the intensity of the light that passes through the shutter panel  20  by expanding the light transmitting regions  21 . As a result, the information display device  1  easily causes the user to visually recognize the background and the image. 
     Even if the proportion of the area occupied by the light emitting portions  14  with respect to the area of the entire light emitting panel  10  exceeds 50%, the information display device  1  can cause the second light to hardly enter the first eye by expanding an area of the dimming regions  22  of the shutter panel  20 . 
     The controller  30  may control the dimming regions  22  of the shutter panel  20 , based on the information relating to the position of each of the left eye  5 L and the right eye  5 R of the user. The controller  30  may cause the acquisition unit  40  to acquire the information relating to the position of each of the left eye  5 L and the right eye  5 R of the user. The information relating to the position of the first eye of the user is also referred to as first position information. The information relating to the position of the second eye of user is also referred to as the second position information. That is, the controller  30  may cause the acquisition unit  40  to acquire the first position information and the second position information and may control the dimming regions  22  of the shutter panel  20 , based on the first position information and the second position information. 
     The acquisition unit  40  is configured to acquire the information relating to the position of at least one of the left eye  5 L and the right eye  5 R of the user and output the information to the controller  30 . The acquisition unit  40  may acquire the information relating to the position of each of the left eye  5 L and the right eye  5 R of the use. In the case where the acquisition unit  40  is connected to the camera  2 , the information relating to the position of the left eye  5 L or the right eye  5 R of the user may be acquired from the camera  2 . 
     The camera  2  may detect the position of at least one of the left eye  5 L and the right eye  5 R of the user and output the information relating to the position. The camera  2  may capture the face of the user and detect the position of at least one of the left eye  5 L and the right eye  5 R based on the captured image. The camera  2  may detect the position of at least one of the left eye  5 L and the right eye  5 R, based on the captured image as the coordinates of the three-dimensional space. The camera  2  may include a plurality of imaging elements. The camera  2  may detect the position of at least one of the left eye  5 L and the right eye  5 R, based on the captured image of each imaging element as coordinates of a three-dimensional space. 
     The acquisition unit  40  may include the camera  2 , or may be connected to the camera  2  provided as a configuration separate from the information display device  1 . The acquisition unit  40  may include an input terminal for inputting a signal from the camera  2 . The camera  2  may be directly connected to the input terminal. The camera  2  may be indirectly connected to the input terminal via a shared network. In the case where the camera  2  is not included, the acquisition unit  40  not including the camera  2  may include an input terminal for receiving an input of a video signal from the camera  2 . In the case where the camera  2  is not included, the acquisition unit  40  may detect the position of at least one of the left eye  5 L and the right eye  5 R from the video signal input to the input terminal. 
     For example, the acquisition unit  40  may include a sensor. The sensor may be an ultrasonic sensor, a light sensor, or the like. The acquisition unit  40  may detect the position of the head of the user by the sensor and detect the position of at least one of the left eye  5 L and the right eye  5 R, based on the position of the head. By one or more sensors, the acquisition unit  40  may detect the position of at least one of the left eye  5 L and the right eye  5 R as the coordinates of the three-dimensional space. 
     The acquisition unit  40  calculates the distance between the left eye  5 L and the right eye  5 R and the shutter panel  20  as the observation distance (P), based on the detection result of the position of at least one of the left eye  5 L and the right eye  5 R. The acquisition unit  40  can calculate the difference between the coordinates of the left eye  5 L and the right eye  5 R in the Z axis direction and the coordinates of the shutter panel  20  in the Z axis direction as the observation distance (P). The acquisition unit  40  may calculate the inter-eye distance (E), based on the detection result of the position of each of the left eye  5 L and the right eye  5 R. 
     The information display device  1  may not include the acquisition unit  40 . In the case where the information display device  1  does not include the acquisition unit  40 , the controller  30  may include an input terminal that is provided outside the device and receives an input of a signal from a detection device of the positions of the eyes of the user. The detection device outside the device may be connected to the input terminal. The detection device outside the device may use an electric signal and a light signal as a transmission signal to the input terminal. The detection device outside the device may be indirectly connected to the input terminal via a shared network. 
     By the controller  30  controlling the shutter panel  20  based on the information relating to the positions of the eyes of the user, the user easily visually recognizes the background and the image simultaneously. 
     The controller  30  may control the shutter panel  20  in an assumption that the user is at a predetermined position with respect to the information display device  1 . In this case, the user may move relatively to the information display device  1  so as to easily visually recognize the background seen beyond the transmitting portions  12  and the image configured with the light emitted from the light emitting portions  14 , simultaneously. 
     As a device according to a comparative example, assumed is a device configured to include the light emitting panel  10  including the transmitting portions  12  and the light emitting portions  14  but not include the shutter panel  20 . In the case where the user looks at the device according to the comparative example, both of the first light passing through the transmitting portions  12  and the second light emitted from the light emitting portions  14  enter the eyes of the left eye  5 L and the right eye  5 R of the user. In the case where both of the first light and the second light enter one eye, the user hardly focuses on both of the light simultaneously. For example, in the case where the light emitting portions  14  emit light with the relatively low brightness, the eyes easily focus on the background, but hardly focus on the light emitting portions  14  or hardly visually recognize the image with the low brightness. Meanwhile, in the case where the light emitting portions  14  emit light with the relatively high brightness, the eyes easily focus on the light emitting portions  14  but hardly focus on the background. Therefore, even if both of the first light and the second light enter one eye, it is difficult to visually recognize both of the background and the image by one eye. 
     Meanwhile, the information display device  1  according to the present embodiment includes the shutter panel  20  including the light transmitting regions  21  and the dimming regions  22 . The shutter panel  20  can operate so that the light passing through the transmitting portions  12  is visually recognized by one eye of the left eye  5 L and the right eye  5 R of the user and the light emitted from the light emitting portions  14  is visually recognized with the other eye. In this manner, the user can focus on the background with one eye and focus on the light emitting portions  14  with the other eye. As a result, the user can visually recognize the background passing through the transmitting portions  12  and the image relating to the light emitted from the light emitting portions  14 , simultaneously. That is, the image is seen by the user to be overlapped with the background. 
     In the case where the light emitting portions  14  are included in the first visible region controlled so that the second light does not enter the first eye, the controller  15  can reduce the light emission of the light emitting portions  14 . The controller  15  can reduce the visual recognition of the light emitting portions  14  by the first eye by reducing the light emission by the light emitting portions  14  included in the first visible region. 
     The configuration according to the disclosure is not limited only to the embodiment described above, and various modifications and changes can be made. For example, the functions included in each component and the like can be rearranged without logically inconsistency, and a plurality of components and the like can be combined into one or separated. 
     The diagram illustrating the configuration according to the disclosure is schematic. The dimensional ratios on the drawings do not always match the actual ones. 
     In the disclosure, the descriptions such as “first” and “second” are identifiers for distinguishing the configuration. The configurations distinguished by the descriptions such as “first” and “second” in the disclosure can exchange numbers in the relevant configurations. For example, “first” of the first light can be exchanged with “second” of the second light. The exchange of the identifiers can be performed simultaneously. After the exchange of the identifiers, the configuration is distinguished. The identifier may be deleted. The configuration with the identifier removed is distinguished by a reference numeral. The description of the identifiers such as “first” and “second” in the disclosure should not be used merely as a basis for interpretation of the order of the configurations or the existence of identifiers with smaller numbers. 
     In the disclosure, the X axis, the Y axis, and the Z axis are provided for convenience of explanation and may be interchanged with each other. The configurations according to the disclosure are described using a Cartesian coordinate system composed of the X axis, the Y axis, and the Z axis. The positional relationship of each configuration in the disclosure is not limited to an orthogonal relationship. 
     REFERENCE SIGNS LIST 
     
         
         
           
               1 : Information display device 
               2 : Camera 
               5 L: Left eye 
               5 R: Right eye 
               10 : Light emitting panel 
               12 : Transmitting portion 
               14 : Light emitting portion 
               16 L: Left eye visible region 
               16 R: Right eye visible region 
               17 L: Left eye non-visible region 
               17 R: Right eye non-visible region 
               20 : Shutter panel 
               21 : Light transmitting region 
               22 : Dimming region 
               30 : Controller 
               40 : Acquisition unit 
               100 : Information display system