Aerial image display device provided with biometric authentication system

Abstract

[Problem] To provide an aerial image display device capable of smoothly carrying out biometric authentication.　Provided is an aerial image display device which has mounted thereon an authentication system equipped with: a display device that displays a video in the air; and an imaging device that acquires biometric information of a user's hand placed near the aerial video displayed by the displace device. Specifically, at the time of acquiring, by the imaging device, the biometric information of the user's hand, a guide display for guiding the position of the hand is displayed in the air to thereby allow the user to superpose the hand on the guide display, whereby the hand can be aligned with a position suited for acquiring the biometric information of the hand by the imaging device.

Description

Technical Field

[0001] The present invention , raw relates to an authentication system capable of performing body authentication in a contactless manner. to

Background Art

[0002] The pandemic caused by the recent novel coronavirus has made people realize how vulnerable 21st-century society, which has seen an increase in population density and entered the era of high-speed mass transportation, is to infectious diseases. In such a situation, everything around us seems to be a source of infection, and the living situation becomes extremely cramped. In fact, during the spread of the infection, it is necessary to be suspicious of everything.

[0003] Although it is important to take measures such as wearing masks, keeping a sufficient distance from others, and avoiding crowds, it is inevitable to come into contact with the minimum infection route in order to lead a necessary social life. Minimizing this risk is crucial for preventing infection.

[0004] For example, at bank ATMs, supermarket self-checkouts, company receptions, hotel check-ins, etc., an unspecified number of users operate the same touch panel. Such a touch panel can be a potential infection route. To avoid this risk, it is necessary to disinfect the touch panel every time the user changes, but such a treatment is quite time-consuming and difficult to perform thoroughly.

[0005] In recent years, in such a situation, a technology that can non-contactedly indicate an aerial image formed in the air using a special optical element has attracted attention. By using this technology, a completely non-contact interface can be realized with the same usability as a conventional touch panel.

[0006] ​For example, in Patent Document 1, since it is a hygienic problem for a surgeon to touch a pointing device such as a computer mouse during surgery, the mouse on the non-contact remote pointer control device displayed using the aerial imaging technology is operated. As such a special optical element, for example, there is an optical imaging device described in Patent Document 2.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0008] Thus, one typical application of the aerial imaging technology is an aerial image display device as described in Patent Document 1, but there are cases where it is inconvenient if anyone can freely access it. For example, access to personal information etc. needs to be restricted to users. Therefore, it is conceivable to provide an authentication device, but even if the operation itself is non-contact, if authentication cannot be performed non-contact, it is insufficient for preventing infection.

[0009] Therefore, an object of the present invention is to be able to perform authentication easily and effectively in a non-contact manner Biometric authentication system and to provide the same.

Means for Solving the Problems

[0010] In order to solve the above problems, according to one aspect of the present invention The biometric authentication system includes a display device, an operation space provided at a position separated from the display device, an authentication device that acquires biometric information of the user's hand in the operation space and performs biometric authentication, and a detection device that detects the position of the user's hand in the operation space. The display device displays the position of the user's hand in the operation space detected by the detection device, and the display device further displays the position of the user's hand in the operation space that is optimal for performing the biometric authentication.

[0011] Also, in one preferred embodiment, The display indicating the position of the user's hand in the operation space that is optimal for performing the biometric authentication and the display indicating the position of the user's hand detected by the detection device are both displays of hand images. The user can move the hand in the operation space so that these hand images overlap, and thus move the hand to the optimal position for performing the biometric authentication. .

[0012] Furthermore, in one preferred embodiment, The display device is an aerial image display device. .

[0013] Furthermore, in one preferred embodiment, the biometric authentication is characterized in that it is palm vein authentication, palmprint authentication, palm shape authentication, finger vein authentication or fingerprint authentication.

Advantages of the Invention

[0014] According to the present invention Biometric authentication system according to , ga By relying on the ID display, it is possible to easily place the hand at a position suitable for biometric authentication, so that biometric authentication can be smoothly executed.

Brief Description of the Drawings

[0015] [Figure 1] FIG. 1 is a perspective view showing an aerial image display device 1 according to Embodiment 1 of the present invention. [Figure 2] FIG. 2 is a side view showing the aerial image display device 1 in a state of performing biometric authentication according to Embodiment 1 of the present invention. [Figure 3] FIG. 3 is a diagram showing an example of a non-contact interface screen displayed on the aerial image display device 1 according to Embodiment 1 of the present invention. [Figure 4] FIG. 4 is a perspective view showing an aerial image display device 2 according to Embodiment 2 of the present invention. [Figure 5] FIG. 5 is a perspective view showing a state in which an operation is being performed on the aerial image display device 2 shown in FIG. 4. [Figure 6] FIG. 6 is a side view showing a state in which an operation is being performed on the aerial image display device 2 shown in FIG. 4. [Figure 7] FIG. 7 is a perspective view showing a state in which a guide image G for performing biometric authentication using the aerial image display device 2 shown in FIG. 4 is displayed. [Figure 8] FIG. 8 is a side view showing a state in which biometric authentication is being performed using the aerial image display device 2 shown in FIG. 4. [Figure 9] FIG. 9 is a perspective view showing another method of performing biometric authentication using the aerial image display device 2 shown in FIG. 4. [Figure 10] FIG. 10 is a side view showing the folded state of the aerial image display device 2 according to Embodiment 2 of the present invention. [Figure 11] FIG. 11 is a front view showing the folded state of the aerial image display device 2 according to Embodiment 2 of the present invention. [Figure 12] FIG. 12 is a rear view showing the folded state of the aerial image display device 2 according to Embodiment 2 of the present invention. [Figure 13] FIG. 13 is a view showing a dark screen used in the aerial image display device 2 according to Embodiment 2 of the present invention. [Figure 14] FIG. 14 is a perspective view showing a state in which the dark screen of FIG. 13 is attached to the aerial image display device 2 according to Embodiment 2 of the present invention.

Mode for Carrying Out the Invention

Example

[0016] Hereinafter, an example of an aerial image display device provided with a biometric authentication system according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view showing an aerial image display device 1 at the time of performing biometric authentication according to an embodiment of the present invention. FIG. 2 is a diagram showing the internal configuration of the aerial image display device 1 according to the embodiment of the present invention, and is a diagram showing a state in which biometric authentication is being performed. In this embodiment, palm vein authentication is performed as biometric authentication.

[0017] As shown in these figures, the aerial image display device 1 includes a box-shaped housing 10, a liquid crystal display 20 installed inside at an angle of about 45 degrees with respect to the horizontal plane, an optical plate 30 placed horizontally on the upper surface of the housing 10, an infrared LED 32 for operation detection and a pair of infrared cameras 34 provided on the front side thereof, an infrared LED 36 and an infrared camera 38 for vein authentication provided on the opposite side of the optical plate 30, a speaker 39, and a control device 40 for processing input / output signals of these elements.

[0018] The control device 40 is substantially a small computer and is composed of a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), a storage device for storing various programs and data, an input / output interface, etc. As the input / output interface, for example, a wireless LAN such as a USB port or WIFI is installed.

[0019] The optical plate 30 has an incident surface 31 facing downward and facing the display surface 24 of the liquid crystal display 20, and an exit surface 33 facing directly upward. Then, the image on the display surface 24 of the liquid crystal display 20 is condensed again as an aerial image 4 at the same position on the opposite side at the same distance through the optical plate 30 to form the same image as the original. As will be described later, if a non-contact interface is displayed on this aerial image 4, the aerial image display device also functions as a non-contact input device.

[0020] As such an optical plate 30, for example, an optical coupling element described in Japanese Patent Application Laid-Open No. 2011-175297 can be used. This optical coupling element is realized by arranging a large number of planar light reflection parts orthogonal to each other at a constant pitch. In addition, a structure such as a two-sided corner reflector in which a reflection surface is formed on the side surface of a square hole as described in Japanese Patent No. 4900618 may also be used.

[0021] An infrared LED 32 for operation detection and an infrared camera 34 are used to photograph the user's hand near the aerial image 4 to detect the position and movement of the user's hand. Therefore, the photographing device including the infrared LED 32 and the infrared camera 34 constitutes an operation detection unit that detects operations performed by the user on the aerial image 4. That is, the user's hand is separately imaged from the left and right by a pair of infrared cameras 34, and the obtained infrared images are processed by the control device 40 to detect the movement of the user's hand. For example, when controls such as buttons, check boxes, and drop-down menus are displayed on the aerial image 4 and the user performs a gesture operation to operate one of them with a finger, the control device 40 detects the operation via the operation detection unit, and various processes such as changing the display of the aerial image 4 are performed accordingly. Therefore, the aerial image 4 functions as a non-contact interface. Note that the detection range of the operation detection unit is defined by the emission angle of the infrared LED 32 and the field angle of the infrared camera 34.

[0022] Also, an infrared LED 36 and an infrared camera 38 for vein authentication are used to detect the vein pattern on the palm of the user's hand. That is, near-infrared light is irradiated from the infrared LED 36 onto the palm. When this near-infrared light passes through the inside of the palm, reduced hemoglobin in the blood absorbs the near-infrared light, so the veins on the palm appear as shadows and are photographed by the infrared camera 38, and the vein pattern is acquired as an image signal. The acquired image signal is processed by the control device 40, and general vein authentication processes such as image registration and verification are performed.

[0023] When performing vein authentication, the user holds the palm in front of the infrared LED 36. This is done non-contact, and the user can perform registration and verification without a sense of resistance. However, during actual image registration and verification, the position, size, and inclination of the image become problems. That is, if the posture of holding the palm in front of the photographing device, the distance, position, inclination, and size between the photographing device and the palm are different, the registered image and the verification image will be very different even for the same palm, making accurate verification difficult.

[0024] Therefore, in the biometric authentication system of the aerial image display device according to the present invention, as shown in FIG. 1, when performing vein authentication, an image of the palm (hereinafter referred to as a guide image) that serves as a guide is displayed on the aerial image 4, and registration and verification processes are performed. The vein authentication system including the infrared LED 36 and the infrared camera 38 is configured based on the position, size, and inclination of this palm image. Therefore, if the user overlays his or her own palm on the guide image G displayed on the aerial image 4 as shown in FIG. 2, an image suitable for the vein authentication process can be captured.

[0025] For example, when performing user registration, after displaying the guide palm image (guide image G), a guidance voice such as "Since user registration is to be performed, please place your right hand on the displayed guide image" is played from the speaker 39. Then, after confirming that the user has placed his or her own palm H on the guide image G displayed on the aerial image 4 as instructed, the vein image of the user is captured and registered. Also, when performing user authentication, after displaying the guide image G, a guidance voice such as "Since user authentication is to be performed, please place your right hand on the displayed guide image" is played from the speaker 39.

[0026] Then, after confirming that the user has placed his or her own palm H on the palm image (guide image G) displayed on the aerial image 4 as instructed, the vein image is captured and compared with the registered vein image for verification. As a result of the comparison of the vein images, if the vein authentication is successful, as shown in FIG. 3, the aerial image display device 1 shifts from the authentication mode to the operation mode, and normal input / output using a finger becomes possible for the non-contact interface I displayed on the aerial image 4.

Example

[0027] Next, Example 2 of the aerial image display device according to the present invention will be described. This aerial image display device 2 is a foldable aerial image display device that can be folded small and carried around freely. FIG. 4 is a perspective view showing the aerial image display device 2 according to Example 2 of the present invention. FIG. 5 is a perspective view showing the aerial image display device 2 in a state of use according to Example 2 of the present invention. FIG. 6 is a side view showing the aerial image display device 2 in a state of use according to Example 2 of the present invention.

[0028] As shown in these figures, the aerial image display device 2 includes a support substrate 60 on which an information processing device for performing overall signal processing is mounted, a liquid crystal display 70 connected to the support substrate 60 via a hinge portion 62, and an optical plate 80 connected to the liquid crystal display 70 via a hinge portion 72. Further, a pair of left and right speakers 68 are provided on the support substrate 60, and click sounds and guidance voices are appropriately reproduced.

[0029] The information processing device mounted on the support substrate 60 is substantially a small computer and is composed of a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), a storage device for storing various programs and data, an input / output interface, and the like. As the input / output interface, for example, a USB port 64 and a wireless LAN such as WIFI are implemented.

[0030] The surface of the liquid crystal display 70 facing the optical plate 80 is the display surface 74. That is, in the operable state of the aerial image display device 2 shown in FIGS. 4 to 6, the display surface 74 faces obliquely upward. Then, based on the display data transmitted from the support substrate 60, a non-contact interface is displayed on the display surface 74. The non-contact interface here is composed of components such as buttons, icons, and menus, and the user can input to the system by operating these components.

[0031] The optical plate 80 has an incident surface 81 facing downward towards the display surface 74 of the liquid crystal display 70, and an exit surface 83 facing directly upward. The image on the display surface 74 of the liquid crystal display 70 is re-focused as an aerial image 54 at the same distance on the opposite side to form the same image as the original one.

[0032] Similar to Example 1, as such an optical plate 80, for example, an optical coupling element described in Japanese Patent Application Laid-Open No. 2011-175297 can be used. This optical coupling element is realized by arranging a large number of planar light reflection parts orthogonal to each other at a constant pitch. In addition, a structure such as a two-sided corner reflector in which a reflecting surface is formed on the side surface of a square hole as described in Japanese Patent No. 4900618 may also be used.

[0033] In addition, near the hinge portion 72 of the optical plate 80, an infrared LED 82 and a pair of infrared sensors 84 are provided. The infrared LED 82 and the infrared sensors 84 constitute an operation detection unit for detecting an operation on the aerial image 54 performed by the user. The detection range of the operation detection unit is defined by the emission angle of the infrared LED 82 and the angular field of view of the infrared sensors 84.

[0034] The support substrate 60, the liquid crystal display 70, and the optical plate 80 are respectively connected by the hinge portion 62 and the hinge portion 72, but are fixed in the operable state of the aerial image display device 2 shown in FIGS. 4 to 6 by a pair of left and right locking rods 90.

[0035] That is, the locking rod 90 is pivotally supported rotatably by a shaft 92 provided at the center of the side surface of the liquid crystal display 70, and can engage with the engaging recess 66 of the support substrate 60 and the engaging recess 86 of the optical plate 80. In the use state where both ends of the locking rod 90 are engaged with the engaging recess 66 of the support substrate 60 and the engaging recess 86 of the optical plate 80, the optical plate 80 is horizontally supported, and the liquid crystal display 70 is fixed at an angle of about 45 degrees downward with respect to the optical plate 80. Further, in this use state, the liquid crystal display 70 and the support substrate 60 are fixed at an angle of about 45 degrees.

[0036] It is important that the angle between the liquid crystal display 70 and the optical plate 80 is about 45 degrees. At this angle, the light from the liquid crystal display 70 is imaged on the aerial image 54 under optimal conditions. Also, the angle between the liquid crystal display 70 and the support substrate 60 is about 45 degrees, and at this angle, the optical plate 80 is horizontal. More specifically, it is desirable that the about 45 degrees be in the range of generally 40 degrees to 50 degrees.

[0037] In such a state, when an operation interface is displayed on the liquid crystal display 70, it is imaged as a non-contact interface on the aerial image 54 imaged on the opposite side of the optical plate 80. When a gesture such as touching with a finger is made with respect to this non-contact interface, the operation is detected by the operation detection unit including the infrared LED 82 and the infrared sensor 84, and the corresponding operation signal is sent to the information processing device of the support substrate 60, and predetermined processing is performed. Components of the operation interface include, for example, controls such as buttons, check boxes, and drop-down menus.

[0038] Furthermore, in the aerial image display device 2 according to the present invention, an imaging element 98 is provided above the center of the back surface of the liquid crystal display 70, and an imaging element 99 is provided at the center inside the hinge portion 62. The imaging element 98 images the space (hereinafter referred to as the operation space S) between the support substrate 60 and the liquid crystal display 70 from above, and the imaging element 99 images the operation space S between the support substrate 60 and the liquid crystal display 70 from the front. By these imaging elements 98 and 99, the movement of the hand H inserted into the operation space S between the support substrate 60 and the liquid crystal display 70 is detected.

[0039] The hand H detected by these imaging elements 98 and 99 is displayed on the display surface 74 of the liquid crystal display 70 and as an aerial image 54 as a converged image through the optical plate 80. However, only the outline H' of the hand H is displayed or displayed semi-transparently so as not to block the non-contact interface displayed in the aerial image 54. By the movement of the hand H, the non-contact interface of the aerial image 54 can be operated using this hand H'.

[0040] Therefore, there are two systems as input methods to the aerial image display device 2 of the present Example 2. One is the conventional method of directly operating on the non-contact interface displayed in the aerial image 54, and the other is not to directly operate on the non-contact interface on the aerial image 54 by hand, but to move the hand H in the operation space between the support substrate 60 and the liquid crystal display 70, and to operate the non-contact interface through the hand H' displayed in the aerial image 54.

[0041] That is, when the infrared sensor 84 detects a hand directly operating on the non-contact interface displayed in the aerial image 54, an input is accepted according to the operation. On the other hand, when the imaging elements 98 and 99 detect the hand H, the movement of the corresponding hand H' in the aerial image 54 is displayed according to the movement, and an input through this hand H' is accepted.

[0042] Furthermore, in the aerial image display device 2 according to the present invention, a pair of infrared LEDs 96 and an infrared camera 97 for vein authentication are provided near the center on the opposite side of the optical plate 80, that is, on the side opposite to the infrared LED 82 and the infrared sensor 84. By holding a hand in front of this infrared camera 97, the vein pattern on the palm of the hand can be photographed by the near-infrared rays irradiated from the infrared LED 96 to perform vein authentication.

[0043] As shown in FIG. 7, when performing user registration, first, an image of the palm of a hand (guide image G) serving as a guide is displayed in the aerial image 54. Then, a guidance voice such as "Since user registration will be performed, please place your right hand on the displayed guide image" is played from the speaker 68.

[0044] Then, as shown in FIG. 8, when it is confirmed that the user has superimposed his / her palm H on the guide image G displayed in the aerial image 54 as instructed, the vein image of the user is captured and registered.

[0045] Also, when performing user authentication, after displaying the guide image G, guidance voice such as "Since user authentication will be performed, please place your right hand on the displayed guide image" is played from the speaker 68.

[0046] Then, as shown in FIG. 8, when it is confirmed that the user has superimposed his / her right hand on the guide image G in the aerial image 54 as instructed, the infrared LED 96 and the infrared camera 97 are used to capture the vein image of the user's hand and compare it with the registered reference vein image. As a result of the comparison of the vein images, if the vein authentication is successful, as shown in FIG. 4, the guide image G disappears and the aerial image display device 2 shifts from the authentication mode to the operation mode, enabling normal input / output using fingers.

[0047] Also, in the aerial image display device 2 according to the present invention, a pair of infrared LEDs 106 and infrared cameras 107 for vein authentication are also provided in front of the central portion of the support substrate 60. Similar to the case of using the infrared LED 96 and the infrared camera 97, by inserting a hand into the operation space between the support substrate 60 and the liquid crystal display 70 and holding the hand over the infrared camera 107, the vein pattern of the palm can be captured by the near-infrared rays irradiated from the infrared LED 106, and vein authentication can be performed.

[0048] As shown in Fig. 9, when performing user registration, first, an image of the palm (guide image G) serving as a guide is displayed on the aerial image 54. Then, a guidance voice such as "Since user registration is to be performed, please insert your right hand into the lower operation space and adjust the position so that the displayed guide image of the hand overlaps with the image of your own hand" is played from the speaker 68. When the user confirms that the image H' of their own palm has been superimposed on the guide image G as instructed, the vein image of the user's hand is captured and registered.

[0049] Also, when performing user authentication, after displaying the guide image G on the aerial image 54, a guidance voice such as "Since user authentication is to be performed, please insert your right hand into the lower operation space and adjust the position so that the displayed guide image of the hand overlaps with the image of your own hand" is played from the speaker 68. When the user confirms that the image H' of their own palm has been superimposed on the guide image G in the aerial image 54 as instructed, the vein image of the user's hand is captured using the infrared LED 106 and the infrared camera 107, and compared with the registered vein image for verification. As a result of the comparison of the vein images, if the vein authentication is successful, as shown in Fig. 5, the guide image G disappears and the aerial image display device 2 shifts from the authentication mode to the operation mode, enabling normal input and output using fingers.

[0050] Therefore, there are two methods for positioning the palm to capture the vein image on the aerial image display device 2 of the present Example 2. One is the method of directly superimposing the hand on the guide image G displayed on the non-contact interface shown in Fig. 8, and the other is not directly superimposing the hand on the guide image G on the aerial image 54, but by moving the hand H in the operation space between the support substrate 60 and the liquid crystal display 70, and appropriately determining the position of the hand through the guide image and the hand image H' displayed on the aerial image 54.

[0051] Note that this aerial image display device 2 is excellent in portability. That is, when carrying it, both ends of the locking rod 90 are removed from the engaging recess 66 of the support substrate 60 and the engaging recess 86 of the optical plate 80, and the support substrate 60, the liquid crystal display 70, and the optical plate 80 are rotated at the hinge portion 62 and the hinge portion 72, and are horizontally and stacked small as shown in the side view of FIG. 10, the front view of FIG. 11, and the rear view of FIG. 12.

[0052] Therefore, the aerial image display device according to the second embodiment of the present invention is a portable type that can be folded small and carried freely. For example, this aerial image display device can be put in a bag and carried around, and non-contact online payment can be executed at the destination.

[0053] Also, in order to realize a clearer aerial image 54, it is desirable that external light does not be added to the light from the liquid crystal display 70. For this purpose, it is good to use a dark curtain 94 as shown in FIG. 13. The dark curtain 94 is for covering the space between the liquid crystal display 70 and the optical plate 80, and is composed of a left shielding portion 94L, a central shielding portion 94C, and a right shielding portion 94R.

[0054] The left shielding portion 94L covers the left open portion between the liquid crystal display 70 and the optical plate 80, the central shielding portion 94C covers the central open portion between the liquid crystal display 70 and the optical plate 80, that is, the back surface portion, and the right shielding portion 94R covers the right open portion between the liquid crystal display 70 and the optical plate 80.

[0055] A hook-and-loop fastener 96 is provided at the edge of the dark curtain 94. Although not directly shown in the figure, a hook-and-loop fastener is also provided on the corresponding surface of the aerial image display device 2. The hook-and-loop fasteners of the dark curtain 94 and the aerial image display device 2 are a female fastener on one side and a male fastener on the other side, and can be adhered so as to completely cover the space between the liquid crystal display 70 and the optical plate 80 as shown in FIG. 14. Thereby, external light does not be added to the light from the liquid crystal display 70, and a clearer aerial image 54 can be realized.

[0056] Here, it is assumed that the light-shielding curtain 94 is attached when in use, but it may be permanently fixed to the liquid crystal display 70 and the optical plate 80 without attaching or detaching. In this case, when folding the airborne image display device 2, it is folded between the liquid crystal display 70 and the optical plate 80. As a folding method, for example, a bellows fold that folds in a zigzag like a folding fan may be used.

Industrial Applicability

[0057] According to the present invention, by using an airborne image, non-contact biometric authentication can be effectively performed, reducing the risk of infection by pathogens that are feared during biometric authentication and enabling safe use. Biometric authentication system can be realized.

[0058] As described above, the biometric authentication system according to the present invention mu has been described based on the embodiments, but the present invention is not limited thereto, and modifications may be made without departing from the spirit of the present invention, and if possible, the techniques described in each embodiment may be combined, or known techniques may be combined.

[0059] For example, in the above embodiment, vein authentication is adopted as biometric authentication, but the present invention is not limited thereto. That is, other authentication methods that utilize biometric information on the palm can also be adopted. Specifically, palmprint authentication that authenticates an individual based on the pattern formed by the raised lines of the skin on the palm, palm shape authentication that authenticates an individual based on the shape of the palm, etc. can also be adopted in the same manner as the above vein authentication. Furthermore, it is also possible to improve the authentication accuracy by combining palmprint authentication or palm shape authentication in addition to vein authentication.

[0060] Furthermore, not only the palm but also the biometric information of each finger may be utilized. That is, it is also possible to apply the present invention to finger vein authentication or general fingerprint authentication that utilizes the vein pattern or pattern pattern of each finger.

[0061] In the above embodiment, a liquid crystal display is adopted as the display for projecting the aerial image 4. However, the present invention is not limited thereto, and an organic EL display, an electronic paper, or the like may be adopted.

[0062] Furthermore, in the above embodiment, a photographing device for acquiring biological information and a photographing device as a detection device for detecting the movement of the user's hand are provided separately, but these may be unified into one.

Explanation of Signs

[0063] 1, 2 Aerial image display device 4 Aerial image 10 Housing 20 Liquid crystal display 24 Display surface 30 Optical plate 31 Incident surface 33 Exit surface 32, 36 Infrared LED 34, 38 Infrared camera 39 Speaker 40 Control device 54 Aerial image 60 Support substrate 62 Hinge part 64 USB port 66 Engagement recess 68 Speaker 70 Liquid crystal display 72 Hinge part 74 Display surface 80 Optical plate 81 Incident surface 82 Infrared LED 83 Exit surface 84 Infrared sensor 86 Engagement recess 90 Locking rod 92 Shaft 94 Dark curtain 94C Central shielding part 94L Left shielding part 94R Right shielding part 95 Surface fastener 96 and 106 infrared LEDs 97 and 107 infrared cameras 98 and 99 imaging elements

Claims

1. A display device, An operation space provided at a position away from the display device, An authentication device that acquires biometric information of the user's hand in the operation space and performs biometric authentication, A detection device that detects the position of the user's hand in the operation space, and is provided with: The display device displays the position of the user's hand in the operation space detected by the detection device, The display device further displays the position of the user's hand in the operation space that is optimal for performing the biometric authentication. A biometric authentication system characterized by this.

2. The display indicating the position of the user's hand in the operation space that is optimal for performing the biometric authentication and the display indicating the position of the user's hand detected by the detection device are both displays of hand images. The user can move the hand in the operation space so that these hand images overlap, and move the hand to the position that is optimal for performing the biometric authentication. The biometric authentication system according to Claim 1, characterized by this.

3. The display device is an aerial image display device. The biometric authentication system according to Claim 2, characterized by this.

4. The biometric authentication is palm vein authentication, palm print authentication, palm shape authentication, finger vein authentication, or fingerprint authentication. The biometric authentication system according to Claim 3, characterized by this.