JP6787566B2 - Electronic device equipped with biometric authentication device and biometric authentication device - Google Patents

Description

This application relates to a biometric authentication device and an electronic device including a biometric authentication device.

In recent years, electronic devices including mobile terminals such as smartphones and tablets have become widespread, but biometric authentication is performed on electronic devices so that they cannot be used by anyone other than the person who owns the electronic device (hereinafter referred to as the user). Some are equipped with a device. And there is an iris recognition device as one of the biometric authentication devices. An electronic device equipped with an iris recognition device is, for example, as shown in FIG. 1A, an infrared camera dedicated to acquiring an iris (hereinafter, an iris) at one end of a housing 5 outside the display 6 of the electronic device 1. It is equipped with an iris recognition device 4 provided with a camera) 2 and an infrared light emitting diode (hereinafter referred to as IrLED) 3.

The reason why the iris recognition device 4 is equipped with the two devices is that, as shown in FIG. 1 (b), when acquiring the iris pattern of the human eye E, infrared rays are emitted from IrLED3 toward the eye E. This is because the reflected light is photographed by the iris camera 2. The image taken by the iris camera 2 is compared with the user's iris pattern registered in advance in the iris authentication device 4 (including the IC (not shown) built in the electronic device 1), and the user of the electronic device is the user. Whether or not there is is determined. In addition, the reason why infrared rays are used for iris recognition is that visible light is reflected by the cornea of the eye and iris information cannot be read accurately.

Since the iris recognition device is equipped with the above-mentioned two devices, the outer shape of the device becomes large. Further, in order to acquire the iris pattern, as shown in FIG. 1B, the eye E needs to be located within the range of the irradiation light from IrLED3, so that the angle of view of the iris camera 2 and the irradiation of IrLED3 Adjust so that the range fits. Therefore, the two devices have restrictions on the mounting position, and there is a problem that the degree of freedom in designing the internal structure of the electronic device 1 is reduced. Furthermore, if the user uses the device differently from the design intention, for example, when the electronic device 1 is a smartphone, if the infrared light irradiation portion is blocked by the smartphone case, the irradiation range may be narrowed and authentication may not be possible. Be done.

Japanese Unexamined Patent Publication No. 6-342146 JP-A-2010-250789 JP-A-2010-28771

One aspect of the object is to provide a biometric authentication device having a degree of freedom in arranging a light source that emits light for authenticating a living body and an image pickup element that reads reflected light from the living body. On the other side, the outer shape of the electronic device equipped with the biometric authentication device is made smaller, the degree of freedom in design is improved, and the light source is not blocked during use, so that biometric authentication can be performed reliably. The purpose is to provide equipment.

According to one form, it is a biometric authentication device including a display for displaying the biometric authentication result, and is provided on one of the opposite sides of a light guide plate that illuminates the display from the back surface, and white light is transmitted to the light guide plate. An infrared light emitting element provided at an adjacent portion between the incident light emitting element and the other side of the opposite side or the other side of the opposite side and the other side of the opposite side to inject infrared rays into the light guide plate. Provided is a biometric authentication device including an infrared camera provided around the display screen of the display and performing biometric authentication with the infrared light emitting element and the infrared camera.

According to another form, the display provided in the housing, the light guide plate located on the back surface of the display, the light emitting element provided on one side of the light guide plate and incident light on the light guide plate, and the light emitting element An infrared light emitting element provided at a position far from the side of the light guide plate provided to inject infrared rays into the light guide plate, an infrared camera provided in a housing around the display, and an infrared light emitting element and an infrared camera. An electronic device including a biometric authentication device for performing authentication is provided.

According to the disclosed biometric authentication device and the electronic device including the biometric authentication device, there is an effect that the outer shape of the biometric authentication device and the electronic device can be reduced. Further, the infrared rays emitted from the IrLED are not blocked when the biometric authentication device and the electronic device are used, and there is an effect that the biometric authentication can be performed accurately. Further, depending on the installation position of the IrLED, there is an effect that the degree of freedom in the internal design of the biometric authentication device and the electronic device can be improved, that is, the internal volume can be effectively utilized.

(A) is a perspective view of an electronic device of a comparative technique having an iris recognition function, and (b) is an explanatory view showing an iris recognition process by the electronic device shown in (a). (A) is an explanatory view of a diffused reflection pattern of a light guide plate of a backlight incorporated in a display of an electronic device shown in FIG. 1 (a), and (b) is a side view of the backlight shown in (a), (c). ) Is an assembly perspective view showing the structure of the backlight shown in (a) and (b), and (d) is from the backlight when the white LED is lit in the backlights shown in (a) to (c). It is explanatory drawing which shows the emitted light. (A) is a plan view of the backlight incorporated in the disclosed electronic device, (b) is a side view of the backlight shown in (a), and (c) is a structure of the backlight shown in (a) and (b). It is an assembly perspective view which shows. (A) is an explanatory view showing the light emitted from the backlight when only the white LED is lit in the backlight shown in FIG. 3, and (b) is an explanatory diagram showing the light emitted from the backlight when only the Ir LED is lit in the backlight shown in FIG. It is explanatory drawing which shows the light emitted from the backlight. (A) is an explanatory diagram showing an example of an installation position of IrLED in the backlight shown in FIG. 3, and (b) is an explanatory diagram showing an iris authentication process by an electronic device incorporating the backlight shown in (a). .. It is a block circuit diagram which shows the internal structure of the electronic device which incorporated the backlight shown in FIG. It is a flowchart explaining the procedure of the iris authentication processing by the electronic device which incorporated the backlight shown in FIG. (A) is a diagram comparing the dimensions of the electronic device of the comparative technology having the iris recognition function and the electronic device of the disclosure incorporating the backlight shown in FIG. 3, and (b) is the electronic device of the comparative technology having the iris recognition function. The explanatory view showing the mountable range of the iris camera in FIG. 3 and (c) are the explanatory views showing the mountable range of the iris camera in the disclosed electronic device incorporating the backlight shown in FIG. FIG. 3 is a plan view of a disclosed electronic device incorporating a backlight of an embodiment different from the backlight shown in FIG.

Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings, based on specific examples. Members that are also used in the disclosed electronic devices, such as the iris camera 2 and IrLED3 used in the electronic device 1 of the comparative technique shown in FIG. 1, are designated by the same reference numerals in the subsequent embodiments. I will explain.

Before explaining the disclosed electronic device, the backlight 10 of the liquid crystal display of a general electronic device will be described as a comparative technique with reference to FIG. As shown in FIG. 2C, the backlight 10 of the comparative technique is provided with a white LED unit 12 using a white LED as a light emitting element on one side of a flat and transparent light guide plate 11, and is not shown. Visible light is radiated to the liquid crystal display side where the above is omitted. Therefore, a reflective sheet 13 is provided under the light guide plate 11 and the white LED portion 12, and a diffusion sheet 14 and a prism sheet 15 are laminated in this order on the light guide plate 11 on the liquid crystal display side. ..

As shown in FIG. 2D, the light guide plate 11 becomes weaker as the visible light incident from the white LED unit 12 moves away from the white LED unit 12. For this purpose, as shown in FIGS. 2A and 2B, a reflective lens 16 for correcting the amount of light emitted to the liquid crystal display side so as to be uniform is provided on the reflective sheet 13 side of the light guide plate 11. Has been done. The reflective lens 16 has a low reflectance for reflecting white light toward the display side on the side closer to the white LED unit 12, and a higher reflectance for reflecting white light toward the display unit as the distance from the white LED unit 12 increases. It has a diffuse reflection pattern. With this structure, as shown in FIG. 2D, the light emitted from the white LED unit 12 and incident on the light guide plate 11 is reflected by the reflecting lens 16 and the diffusely reflected light is uniformly emitted to the display side. Ru.

In the disclosed electronic device, as shown in FIGS. 3A and 3B, the light guide plate 11 has a large reflectance on the side far from the white LED portion 12 of the light guide plate 11. The IrLED unit 17 is provided on the opposite side of the white LED unit 12 to form the backlight 20. As shown in FIG. 3C, the backlight 20 is formed by providing a white LED portion 12 on one side of the light guide plate 11 and providing an IrLED portion 17 on the opposite side. The backlight 20 is a backlight 10 of a comparative technique in which an IrLED unit 17 is added. A light guide plate 11 and a reflective sheet 13 are provided under the white LED unit 12, and a light guide plate 11 is provided on the display side. The diffusion sheet 14 and the prism sheet 15 are laminated in this order on the top.

Therefore, when only the white LED portion 12 of the light guide plate 11 of the backlight 20 is turned on, as shown in FIG. 4A, the light incident on the light guide plate 11 from the white LED portion 12 is transmitted by the reflective lens 16. It is reflected and diffusely reflected light is uniformly emitted to the display side. This operation is the same as that of the light guide plate 11 in the backlight 10 of the comparative technique. As described above, the reflective lens 16 has a higher reflectance toward the display side on the side closer to the IrLED unit 17. Therefore, when only the IrLED portion 17 of the light guide plate 11 of the backlight 20 is turned on, as shown in FIG. 4B, the infrared rays incident from the IrLED portion 17 are high on the IrLED portion 17 side toward the display side. It is reflected by the reflectance and emitted as a large diffusely reflected light.

FIG. 5A is an explanatory view showing an embodiment of the arrangement of the white LED 22 in the white LED unit 12 attached to the light guide plate 11 of the backlight 20 shown in FIG. 3 and the arrangement of the IrLED 27 in the IrLED unit 17. .. In this embodiment, three white LEDs 22 are arranged on the white LED unit 12 provided on one side of the light guide plate 11, and four IrLED units 17 provided on the opposite side of the light guide plate 11 are arranged. The IrLED 27 is arranged.

When the IrLED 27 is installed on the light guide plate 11, there is a concern that the irradiation power may decrease, but since the light guide plate 11 has a long side, it is possible to mount a plurality of IrLEDs as shown in FIG. 5 (a). Therefore, it is possible to compensate for the decrease in power. Further, when it is desired to increase the irradiation power of IrLED3 in the electronic device 1 of the comparative technique, it is necessary to increase the flowing current or increase IrLED3, but if the number of IrLED3s is increased, the internal volume of the terminal becomes tight. On the other hand, in the disclosed electronic device 7, as a method for increasing the irradiation power, the same method as the comparative technique can be taken, but the irradiation power can be increased by increasing the number of IrLED 27s, and in this case, the internal volume is increased. It will not increase.

FIG. 5B is an explanatory diagram showing an iris authentication process by the electronic device 7 incorporating the backlight 20 shown in FIG. 5A. As shown in FIG. 4B, the infrared rays emitted from the IrLED 27 shown in FIG. 5 (a) are emitted to the liquid crystal display side (not shown), pass through the liquid crystal display, and are electronically emitted from the display 36. It is radiated to the outside of the device 7. The infrared radiation region (emission area) emitted from the IrLED 27, reflected by the light guide plate 11 and emitted to the outside of the electronic device 7 through the liquid crystal display is the infrared radiation emitted from one IrLED3 shown in the comparative technique. Wider than the area. Therefore, the range for acquiring the iris pattern of the human eye E is wide, and it is possible to authenticate even if the angle of view of the iris camera and the IrLED irradiation range deviate from each other. In addition, authentication is possible even if the IrLED irradiation portion is blocked or used unintentionally.

In the electronic device 1 of the comparative technique, in order to optimize the angle of view of the iris camera 2 and the irradiation range of IrLED3, the positional relationship between the iris camera 2 and IrLED3 is limited, and the internal design of the electronic device 1 is restricted. .. However, in the disclosed electronic device 7, since the irradiation range can be expanded, the limitation of the positional relationship can be improved, and as a result, the mountable range of the iris camera 2 can be widened, and the degree of freedom in the internal design of the electronic device 7 can be increased. Becomes larger. In addition, since the window for IrLED is not required, the design can be expected to be improved.

FIG. 6 is a block circuit diagram showing an internal structure of an electronic device 7 incorporating the backlight 20 shown in FIG. The electronic device 1 has a processor 30, and the processor 30 includes a wireless unit 31 having an antenna 31A, an iris camera 32, an LED driver 33, an audio input / output unit 34, a storage unit 35 having a ROM and RAM, and a display. The vessel 36 is connected. The display 36 includes a touch sensor unit 37, a display unit 38, a backlight 20 including a white LED 22 and an IrLED 27, and the backlight 20 is connected to an LED driver 33.

Here, an example of the procedure of the iris authentication processing in the electronic device 7 having the structure as shown in FIG. 6 will be described with reference to the flowchart shown in FIG. The iris authentication process in the electronic device 7 is performed first each time the electronic device 7 is started from the sleep state, and after the iris authentication process is completed and the user is authenticated and the electronic device 7 is put into use, It is not performed during the operation of the electronic device 7. In the following description of the process, the reference numerals of the respective members of the electronic device 7 described above will be used.

In step 701, it is determined whether or not the electronic device 7 has started to be used. If the electronic device 7 has not started to be used (NO), this routine is terminated, and if it is determined that the electronic device 7 has started to be used (YES), the process proceeds to step 702. In step 702, the IrLED 27 is turned on and the iris camera 2 is activated. In the following step 703, the authentication process is performed using the image captured by the iris camera 2. In the next step 704, it is determined whether or not the iris authentication process is completed. If the authentication is not completed (NO), the process returns to step 703 to continue the authentication process, and if the authentication is completed (YES). Proceed to step 705. In step 705, the IrLED 27 is turned off, and the operation of the iris camera 2 is also completed. In the final step 707, the white LED 22 is turned on, and thereafter, the normal backlight 20 is controlled to end this routine.

Here, the point that the disclosed electronic device 7 is superior to the electronic device 1 of the comparative technique will be described with reference to FIG. In the electronic device 1 of the comparative technique shown in FIG. 8A, a single IrLED3 is provided in the outer housing 5 of the light guide plate 11, and the single IrLED3 has a large size, so that the electronic device 1 is vertically arranged. The length of the direction was long. On the other hand, in the disclosed electronic device 7, a plurality of IrLEDs 27 are provided in a portion adjacent to one side of the light guide plate 11, and are not provided on the housing 5. As a result, the disclosed electronic device 7 can be shorter in the vertical direction than the electronic device 1 of the comparative technique.

Further, as shown in FIG. 8B, since a fixed distance is required between the IrLED 3 and the iris camera 2, the electronic device 1 of the comparative technique has a limitation on the mountable range of the iris camera 2. It was. On the other hand, as shown in FIG. 8C, in the disclosed electronic device 7, since the IrLED is arranged inside the housing 5, the range in which the iris camera 2 can be mounted is the electronic device 1 of the comparative technique. Wider than that.

Further, when the IrLED is mounted on one side of the light guide plate 11, the cost is lower than that when the single IrLED is mounted on the housing of the electronic device. This is because when a single IrLED is mounted in the housing of an electronic device, a window is provided in the housing of the electronic device, or a lens that determines the irradiation range of infrared rays from the single IrLED is required. Even if the number of lenses increases, the total cost of disclosed electronic devices is cheaper. Therefore, in the disclosed electronic device, the cost of the iris recognition device can be reduced.

In the embodiment described above, as shown in FIG. 5A, the IrLED unit 17 is provided on the opposite side of the light guide plate 11 with respect to the white LED unit 12 provided on one side of the light guide plate 11. The IrLED 27 is also located on the opposite side of the light guide plate 11. On the other hand, in the disclosed electronic device 7, since the reflectance of the light guide plate 11 is large on the side far from the white LED unit 12, the IrLED 27 may be near the opposite side of the light guide plate 11 even if it is not on the opposite side. In the modified example shown in FIG. 9, the IrLED 27 is provided on both sides of the white LED portion 12 of the light guide plate 11 at positions far from the white LED portion 12 and facing each other. Also in this modified embodiment, since the light guide plate 11 in the vicinity of the portion where the IrLED 27 is provided has high reflectance to the liquid crystal display side, strong infrared rays are emitted from the light guide plate 11 to the display side. Therefore, the effect of the electronic device 7 in this modification is the same as when the IrLED 27 is on the opposite side of the light guide plate 11.

As described above, in the disclosed electronic device 7, the IrLED 27 is mounted on the light guide plate 11 on the back surface of the display 6 of the housing 5 of the electronic device 1 in the direction opposite to that of the white LED 22. IrLED becomes unnecessary, and the outer shape of the housing 5 can be reduced. Further, when the outer shape of the housing 5 is the same as that of the comparison technology, another device such as an illuminance sensor or a proximity sensor can be arranged at an optimum position by improving the degree of freedom in designing the installation position of the iris camera 2. become able to. Further, since the IrLED window is not required for the housing 5, the design can be improved, and the user does not block the IrLED window as in the electronic device 1 of the comparative technology, so that the wide display can be used. Since infrared rays are emitted, it is possible to reliably perform authentication.

The present application has been described in detail above with reference to particularly preferred embodiments thereof. For the sake of easy understanding of this application, the specific forms of this application are added below.

(Appendix 1) A biometric authentication device provided with a display for displaying the biometric authentication result.
A light emitting element provided on one of the opposite sides of the light guide plate that illuminates the display from the back surface and incidents white light on the light guide plate.
An infrared light emitting element provided on the other side of the opposite side or the side on both sides of the other side of the opposite side adjacent to the other side of the opposite side and injecting infrared rays onto the light guide plate.
It is provided with an infrared light receiving unit provided around the display screen of the display.
A biometric authentication device that performs biometric authentication between the infrared light emitting element and the infrared light receiving unit.
(Appendix 2) The display provided on the housing and
A light guide plate located on the back surface of the display and illuminating the display,
A light emitting element provided on one side of the light guide plate and incident light on the light guide plate,
An infrared light emitting element provided at a position far from the side of the light guide plate provided with the light emitting element and injecting infrared rays into the light guide plate.
An infrared receiver provided in the housing around the display and
An electronic device including a biometric authentication device that performs iris recognition by the infrared light emitting element and the infrared light receiving unit.
(Supplementary Note 3) The electronic device according to Supplementary note 2, wherein the infrared light emitting element is provided on the opposite side of the side of the light guide plate provided with the light emitting element.
(Supplementary Note 4) The electronic device according to Supplementary Note 2, wherein the infrared light emitting element is provided on a side adjacent to the opposite side of the side of the light guide plate on which the light emitting element is provided.
(Supplementary Note 5) The electronic device according to Appendix 4, wherein the infrared light emitting element is provided on two sides adjacent to the opposite side in a state of facing each other.

(Appendix 6) From Appendix 2, the light guide plate is formed with a diffuse reflection pattern in which the reflectance toward the display gradually increases from the side on which the light emitting element is provided toward the opposite side. The electronic device according to any one of 4.
(Supplementary Note 7) The electronic device according to any one of Supplementary note 2 to 5, wherein the biometric authentication device performs iris authentication when the electronic device shifts from a sleep state to a use state.
(Supplementary Note 8) The electronic device according to any one of Supplementary note 2 to 6, wherein the light emitting element is a white LED, and the infrared light emitting element is an infrared LED.

1,7 Electronic equipment 2,32 Iris camera (infrared receiver)
3 IrLED (infrared LED)
4 Iris recognition device 5 Housing 6,36 Display 10, 20 Backlight 11 Light guide plate 12 White LED part 17 IrLED part 22 White LED
27 IrLED

Claims (4)

A biometric authentication device equipped with a display that displays biometric authentication results.
A light emitting element provided on one of the opposite sides of the light guide plate that illuminates the display from the back surface and incidents white light on the light guide plate.
An infrared light emitting element provided on the other side of the opposite side or the side on both sides of the other side of the opposite side adjacent to the other side of the opposite side and injecting infrared rays onto the light guide plate.
It is provided with an infrared light receiving unit provided around the display screen of the display.
In the light guide plate, the reflectance of light in the direction of the display increases from the location where the light emitting element is arranged toward the location where the infrared light emitting element is arranged.
A biometric authentication device that performs biometric authentication between the infrared light emitting element and the infrared light receiving unit. The display provided on the housing and
A light guide plate located on the back surface of the display and illuminating the display,
A light emitting element provided on one side of the light guide plate and incident light on the light guide plate,
An infrared light emitting element provided at a position far from the side of the light guide plate provided with the light emitting element and injecting infrared rays into the light guide plate.
An infrared receiver provided in the housing around the display and
An electronic device including a biometric authentication device that performs iris recognition by the infrared light emitting element and the infrared light receiving unit. The electronic device according to claim 2, wherein the infrared light emitting element is provided on the opposite side of the side of the light guide plate provided with the light emitting element. The electronic device according to claim 2, wherein the infrared light emitting element is provided on a side adjacent to the opposite side of the side of the light guide plate on which the light emitting element is provided.

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