JP5910774B2 - Vein imaging device and electronic device - Google Patents

Description

  The present invention relates to a sensing device and an electronic apparatus that irradiates an object with light and receives reflected light.

  In a biometric authentication device or an image scanner, a light emitting unit and a light receiving unit are arranged on the same side with respect to an object (for example, a finger or a document) placed on the reading area, and the light emitting unit is disposed on the object. In some cases, an image of an object is read by irradiating light from the light source and receiving the reflected light by a light receiving unit. For example, in Patent Document 1, light emitted from a light source 6 (near infrared light) is irradiated onto a finger 100 by a plurality of reflecting surfaces 11 formed on the back surface of the light guide plate 3, and a plurality of reflected lights from the finger 100 are emitted. A biological information acquisition device 50 that acquires a vein image of the finger 100 by receiving light with a light receiving element 1 having a pixel PX is described.

JP 2009-172263 A

  However, in the biological information acquisition device 50 described in Patent Document 1, the light source 6 has a larger light amount than the reflected light on the optical path of the reflected light incident on each pixel PX (on the straight line extending in the vertical direction from each pixel PX). There is a light guide plate 3 that guides light emitted from the. Further, part of the light emitted from the light source 6 passes through the low refractive index layer 21 and the reflective layer (semi-reflective layer) 40 formed on the back side of the light guide plate 3 and leaks to the light receiving element 1 side. . For this reason, the light receiving element 1 cannot receive the reflected light from the finger 100 with high accuracy. There is also a problem that the thickness of the biological information acquisition device 50 increases due to the light guide plate 3 and the light shielding layer 2.

  The present invention has been made in view of the above-described problems, and provides a sensing device capable of thinning the device while accurately receiving reflected light from an object, and an electronic apparatus using the sensing device. The issue is to provide.

  In order to solve the above-described problems, a sensing device according to a first aspect of the present invention includes a light emitting unit, a light receiving unit, and a light shielding layer, irradiates light from the light emitting unit to an object, and from the object In the sensing device that receives the reflected light of the light receiving unit, the light emitting unit and the light receiving unit are provided on the same side with respect to the object, the light emitting unit is located on the object side from the light receiving unit, The light emitting unit includes: a light emitting layer that emits irradiation light that irradiates the object; a first electrode that is positioned closer to the object than the light emitting layer and transmits the irradiation light and the reflected light; and the light emitting layer. A second electrode located on the light receiving portion side that shields the irradiation light and the reflected light and has a first opening; and a position corresponding to the first opening; and the irradiation light And transmitting the reflected light and the An insulating layer that partially insulates one electrode from the second electrode, the light receiving unit includes a light receiving element that receives the reflected light, and the light blocking layer corresponds to the first opening. Provided at a position to shield the irradiation light and the reflected light, and a second opening is formed. When viewed in plan from the object side, the light shielding layer overlaps the first opening. The light receiving surface of the light receiving element is located in the second opening.

  According to this configuration, when viewed in plan from the object side, the position corresponding to the light receiving surface of the light receiving element in the light emitting layer and its periphery (the portion corresponding to the first opening) are insulated by the insulating layer. Therefore, it becomes a non-light-emitting region that does not emit irradiation light. Therefore, there is no light emitting region that emits irradiation light having a larger light quantity than the reflected light on the optical path of the reflected light incident on the light receiving surface of the light receiving element. Further, since the portion other than the second opening is shielded by the light shielding layer and the second electrode, reflected light from directly above the reflected light from the object is incident on the light receiving surface of the light receiving element. Further, it is possible to suppress the irradiation light emitted from the light emitting layer (light emitting region) from directly entering the light receiving surface of the light receiving element through the first opening by the light shielding layer and the second electrode. Therefore, it is possible to accurately receive the reflected light from the object in the light receiving element. Moreover, although it is necessary to provide a 1st electrode, a 2nd electrode, a light emitting layer, an insulating layer, and a light shielding layer, since each of these elements can be formed very thinly, compared with the invention described in patent document 1, The thickness of the sensing device can be reduced.

  The target object may be a part of a living body (for example, a finger, palm, back of the hand, eyes, etc.), paper on which a document or image is printed, an OHP (OverHead Projector) sheet, or the like. . Further, the wavelength of light emitted from the light emitting layer can be arbitrarily determined. That is, the irradiation light and the reflected light may be, for example, near infrared light or visible light. Further, the first electrode and the second electrode may be such that the first electrode is an anode and the second electrode is a cathode, or the first electrode is a cathode and the second electrode is an anode. Further, the shape of the second opening and the shape of the light receiving surface of the light receiving element can be arbitrarily determined, such as a rectangle, a circle, an ellipse, and a hexagon. In addition, the size of the second opening and the size of the light receiving surface may be smaller in the second opening than in the light receiving surface, or vice versa, or both may be the same size. May be. Further, it is not always necessary that the entire light receiving surface is located in the second opening, and at least a part of the light receiving surface only needs to be located in the second opening. Further, the light shielding layer can be provided, for example, at a position shown as BM in FIGS. 2, 17, and 18.

  The sensing device according to the second aspect of the present invention includes a light emitting unit, a light receiving unit, and a light shielding layer, irradiates light from the light emitting unit to the object, and receives the reflected light from the object. In the sensing device that receives light at a part, the light emitting part and the light receiving part are provided on the same side with respect to the object, the light emitting part is located on the object side from the light receiving part, and the light emitting part is A light emitting layer that emits irradiation light for irradiating an object, a first electrode that is positioned on the object side from the light emitting layer, and that transmits the irradiation light and the reflected light, and that is positioned on the light receiving unit side from the light emitting layer And the second electrode and the third electrode, which are shielded from the irradiation light and the reflected light, and are provided apart from each other, and a position corresponding to a separation region between the second electrode and the third electrode. The irradiated light and the reflected light An insulating layer that transmits and partially insulates the second electrode and the third electrode from the first electrode, the light receiving unit includes a light receiving element that receives the reflected light, and the light shielding layer includes: Provided at a position corresponding to the separation region, and shields the irradiation light and the reflected light and has an opening, and when viewed in plan from the object side, the light shielding layer is separated from the separation region. It overlaps and the light-receiving surface of the said light receiving element is located in the said opening part, It is characterized by the above-mentioned.

  Even with this configuration, the same effects as those of the sensing device according to the first aspect are achieved. That is, instead of one second electrode having an opening, two electrodes (second electrode and third electrode) provided apart from each other may be used. Also in this configuration, the first electrode may be an anode and the second electrode and the third electrode may be a cathode, or the first electrode may be a cathode and the second electrode and the third electrode may be an anode. .

  In the sensing device according to the first aspect, the light shielding layer may be provided between the object side of the first electrode and the second electrode. Similarly, in the sensing device according to the second aspect, the light shielding layer may be provided between the first electrode and the second electrode and the third electrode from the object side.

The sensing device according to the third aspect of the present invention includes a light emitting unit, a light receiving unit, and a plurality of light shielding layers, irradiates light from the light emitting unit to the object, and reflects reflected light from the object. In the sensing device that receives light by the light receiving unit, the light emitting unit and the light receiving unit are provided on the same side with respect to the object, the light emitting unit is located on the object side from the light receiving unit, and the light emitting unit is A light emitting layer that emits irradiation light for irradiating the object; a first electrode that is positioned closer to the object than the light emitting layer and transmits the irradiation light and the reflected light; and the light receiving unit side from the light emitting layer A plurality of second electrodes that are shielded from the irradiation light and the reflected light and spaced apart from each other, and are provided at positions corresponding to the separation regions for each separation region between the adjacent second electrodes. The irradiation light and the A plurality of insulating layers that transmit incident light and partially insulate the first electrode and the second electrode, and the light receiving unit includes a plurality of light receiving elements that receive the reflected light, and When each of the light shielding layers is provided at a position corresponding to the different separation area, shields the irradiation light and the reflected light, and has one or more openings, and is viewed in plan from the object side In addition, each of the separation regions overlaps with the light shielding layer, and one light receiving surface of the light receiving element is located in each opening.
Even with this configuration, the same effects as those of the sensing device according to the first aspect are achieved. That is, a configuration in which a plurality of light receiving elements are provided and a plurality of second electrodes, insulating layers, and light shielding layers are also provided may be employed.

The sensing device according to the fourth aspect of the present invention includes a light emitting unit, a light receiving unit, and a plurality of light shielding layers, irradiates light from the light emitting unit to the object, and reflects reflected light from the object. In the sensing device that receives light by the light receiving unit, the light emitting unit and the light receiving unit are provided on the same side with respect to the object, the light emitting unit is located on the object side from the light receiving unit, and the light emitting unit is A light emitting layer that emits irradiation light for irradiating the object, and a plurality of first electrodes that are located on the object side from the light emitting layer and that transmit the irradiation light and the reflected light and are spaced apart from each other And a plurality of second electrodes that are located closer to the light receiving part than the light emitting layer, shield the irradiation light and the reflected light, and are spaced apart from each other and intersect the plurality of first electrodes. Space between the matching second electrodes A plurality of insulating layers, each of which is provided at a position corresponding to the separation region, transmits the irradiation light and the reflected light, and partially insulates the first electrode and the second electrode; The unit includes a plurality of light receiving elements that receive the reflected light, and each of the plurality of light shielding layers is provided at a position corresponding to the different separation region, and shields the irradiation light and the reflected light. The openings described above are formed, and when viewed in plan from the object side, each of the separation regions overlaps the light shielding layer, and one light receiving surface of the light receiving element is provided in each opening. It is characterized by being located.
Even with this configuration, the same effects as those of the sensing device according to the first aspect are achieved. That is, the first electrode may also be a plurality of electrodes provided apart from each other.

  In the sensing device according to the third aspect, a first drive that selects a part of the second electrodes as a target for supplying a drive signal for causing the light emitting layer to emit light among the plurality of second electrodes. When the circuit and the plurality of light receiving elements are viewed in plan from the object side, they are incident on the light receiving surface from the light receiving elements adjacent to a part of the second electrodes selected by the first drive circuit. It is good also as a structure provided with the read-out circuit which reads the received light signal which shows the light quantity of the said reflected light.

  According to this configuration, when viewed in plan from the object side, irradiation light can be emitted only from a portion corresponding to the second electrode selected by the first drive circuit in the light emitting layer. Further, the light reception signal can be read out only from the light receiving elements adjacent to a part of the second electrodes selected by the first drive circuit, that is, the light receiving elements located in the vicinity of the portion of the light emitting layer that emits the irradiation light. Accordingly, the light emission range of the irradiation light and the read range of the received light signal can be limited to a part of the drive, so that the power consumption of the sensing device can be reduced.

Further, in the above-described sensing device, a part of the reading area for reading the image of the object is detected and an area where the object is placed is detected, and a part of the first driving circuit selected by the first drive circuit based on the detection result is detected. It is good also as a structure provided with the control circuit which determines 2 electrodes.
In this case, the emission range of the irradiated light and the read range of the received light signal can be determined according to the size and position of the object placed on the reading area.

In the sensing device according to the fourth aspect, a first drive that selects a part of the second electrodes as a target for supplying a drive signal for causing the light emitting layer to emit light among the plurality of second electrodes. A circuit, a second drive circuit that selects a part of the first electrodes as a target for supplying the drive signal among the plurality of first electrodes, and the target side of the plurality of light receiving elements. The light receiving element adjacent to a portion where a part of the second electrodes selected by the first drive circuit and a part of the first electrodes selected by the second drive circuit overlap in a plan view And a readout circuit that reads a light reception signal indicating the amount of the reflected light incident on the light receiving surface.
Also in this configuration, it is possible to drive the light emitting range of the irradiated light and the read range of the received light signal to a part, so that the power consumption of the sensing device can be reduced.

Further, in the above-described sensing device, a part of the reading area for reading the image of the object is detected and an area where the object is placed is detected, and the part of the first drive circuit selected by the first drive circuit based on the detection result It is good also as a structure provided with the control circuit which determines the 2nd electrode and a part of said 1st electrode which the said 2nd drive circuit selects.
Also in this case, the emission range of the irradiated light and the read range of the received light signal can be determined according to the size and position of the object placed on the reading area.

  In the sensing device according to the third aspect, a first drive that selects one or more second electrodes as a target to supply a drive signal for causing the light emitting layer to emit light among the plurality of second electrodes. A circuit, a readout circuit that reads a received light signal indicating the amount of reflected light incident on the light receiving surface from each of the plurality of light receiving elements, and an image of the object based on the received light signal read by the readout circuit A plurality of second electrodes divided into a plurality of groups, the first drive circuit sequentially selecting the plurality of second electrodes in units of groups, and the readout circuit includes: Each time the first driving circuit performs selection in units of groups, the light reception signals are read from all the light receiving elements, and the generation circuit performs selection in units of the groups by the first driving circuit. Further, from all the light receiving signals read by the readout circuit, when viewed in plan from the object side, at least from the light receiving elements adjacent to the one or more second electrodes selected by the first drive circuit An image of the object may be generated based on the remaining light reception signals except for the read light reception signals.

  According to this configuration, when viewed in plan from the object side, a light reception signal from a light receiving element adjacent to one or more second electrodes selected by the first drive circuit, that is, light emitted from the light emitting layer is emitted. An image of an object can be generated without using a light reception signal from a light receiving element located in the vicinity of the portion. Therefore, when a part of the living body is irradiated with near-infrared light and a vein image is generated from the result of receiving the reflected light, the image quality of the vein image is degraded by the surface reflected light reflected from the surface (skin) of the living body. Can be prevented.

  In the sensing device according to the third aspect, a first drive that selects one or more second electrodes as a target to supply a drive signal for causing the light emitting layer to emit light among the plurality of second electrodes. A circuit, a readout circuit that reads a received light signal indicating the amount of reflected light incident on the light receiving surface from each of the plurality of light receiving elements, and an image of the object based on the received light signal read by the readout circuit A plurality of second electrodes divided into a plurality of groups, the first drive circuit sequentially selecting the plurality of second electrodes in units of groups, and the readout circuit includes: Each time the first driving circuit performs selection in units of groups, the light reception adjacent to at least one or more second electrodes selected by the first driving circuit when viewed in plan from the object side. Except for the child, it may be from the remainder of the light receiving element to read the received light signal.

  Also in this case, an image of the object can be generated without using a light reception signal from a light receiving element located in the vicinity of the portion of the light emitting layer that has emitted the irradiated light. Therefore, when a vein image is generated using near infrared light as irradiation light or reflected light, it is possible to prevent the image quality of the vein image from being deteriorated due to the surface reflected light. In addition, since it is not necessary to read out the light reception signal from the light receiving element on which the surface reflected light is incident, the power consumption of the sensing device can be reduced.

  In the sensing device according to the fourth aspect, a first drive that selects one or more second electrodes as a target to supply a drive signal for causing the light emitting layer to emit light among the plurality of second electrodes. A circuit, a second drive circuit that selects one or more of the first electrodes as a target for supplying the drive signal among the plurality of first electrodes, and an incident on the light receiving surface from each of the plurality of light receiving elements A reading circuit that reads a light reception signal indicating the amount of the reflected light, and a generation circuit that generates an image of the object based on the light reception signal read by the reading circuit, the plurality of first electrodes, The plurality of second electrodes are divided into a plurality of groups, the first drive circuit sequentially selects the plurality of second electrodes in the group unit, and the second drive circuit includes the plurality of first electrodes. The group single The readout circuit reads out the received light signals from all the light receiving elements each time the first drive circuit and the second drive circuit perform selection in units of groups, and the generation circuit includes: Every time the first drive circuit and the second drive circuit make a selection in units of groups, from all the received light signals read by the readout circuit, at least when viewed in plan from the object side, The light reception signal read from the light receiving element closest to the portion where the one or more second electrodes selected by the first drive circuit and the one or more first electrodes selected by the second drive circuit overlap. The image of the object may be generated based on the remaining received light signal.

  Even in this configuration, when viewed in plan from the object side, the one or more second electrodes selected by the first drive circuit and the one or more first electrodes selected by the second drive circuit overlap. An image of the object can be generated without using the light reception signal from the light receiving element closest to the part, that is, the light reception signal from the light receiving element closest to the part emitting the irradiation light in the light emitting layer. Therefore, when a vein image is generated using near infrared light as irradiation light or reflected light, it is possible to prevent the image quality of the vein image from being deteriorated due to the surface reflected light.

  In the sensing device according to the fourth aspect, a first drive that selects one or more second electrodes as a target to supply a drive signal for causing the light emitting layer to emit light among the plurality of second electrodes. A circuit, a second drive circuit that selects one or more of the first electrodes as a target for supplying the drive signal among the plurality of first electrodes, and an incident on the light receiving surface from each of the plurality of light receiving elements A reading circuit that reads a light reception signal indicating the amount of the reflected light, and a generation circuit that generates an image of the object based on the light reception signal read by the reading circuit, the plurality of first electrodes, The plurality of second electrodes are divided into a plurality of groups, the first drive circuit sequentially selects the plurality of second electrodes in the group unit, and the second drive circuit includes the plurality of first electrodes. The group single The readout circuit is selected at least when the first drive circuit and the second drive circuit make a selection in units of the group when viewed in plan from the object side. The remaining light receiving elements except for the light receiving element closest to the portion where the one or more second electrodes selected by the driving circuit and the one or more first electrodes selected by the second driving circuit overlap. The received light signal may be read out.

  Also in this case, an image of the object can be generated without using a light reception signal from a light receiving element located in the vicinity of the portion of the light emitting layer that has emitted the irradiated light. Therefore, when a vein image is generated using near infrared light as irradiation light or reflected light, it is possible to prevent the image quality of the vein image from being deteriorated due to the surface reflected light. In addition, since it is not necessary to read out the light reception signal from the light receiving element on which the surface reflected light is incident, the power consumption of the sensing device can be reduced.

  In any of the sensing devices described above, the light emitting layer may emit near infrared light. That is, the irradiation light and the reflected light may be near infrared light. In this case, a vein image can be generated by irradiating a part of the living body with near-infrared light and receiving the reflected light.

  An electronic device according to the present invention includes any one of the sensing devices described above. Electronic devices include, for example, various types of biometric authentication devices that perform biometric authentication based on veins, fingerprints, retinas, irises, and the like, as well as image reading devices such as image scanners, copiers, facsimiles, and barcode readers. In addition, the electronic device may be a personal computer or a mobile phone having a biometric authentication function.

It is a block diagram which shows the structure of the biometrics apparatus which concerns on 1st Embodiment. It is sectional drawing of a sensing unit. It is a top view which shows arrangement | positioning of a cathode and a light receiving element. It is a schematic diagram which shows arrangement | positioning of each layer at the time of paying attention to one light receiving element. It is a top view which concerns on 2nd Embodiment and shows arrangement | positioning of a cathode and a light receiving element. It is a schematic diagram which shows arrangement | positioning of each layer at the time of paying attention to one light receiving element. It is a top view which concerns on 3rd Embodiment and shows arrangement | positioning of an anode, a cathode, and a light receiving element. It is a schematic diagram which shows arrangement | positioning of each layer at the time of paying attention to one light receiving element. It is a figure which shows the circuit structure of the light emission part of the biometrics apparatus which concerns on 4th Embodiment. It is a figure which shows the circuit structure of a light-receiving part. It is a figure for demonstrating the production | generation operation | movement of a vein image. It is a figure for demonstrating the modification of 4th Embodiment. It is a figure which shows the circuit structure of the light emission part of the biometrics apparatus which concerns on 5th Embodiment. It is a figure for demonstrating the production | generation operation | movement of a vein image. It is a figure which concerns on 6th Embodiment and shows the light emission range of irradiated light, and the read range of a received light signal. It is a figure for demonstrating the modification of 6th Embodiment. It is sectional drawing (modified example) of a sensing unit. It is sectional drawing (modified example) of a sensing unit. It is a figure which shows the modification of arrangement | positioning of an anode, a cathode, and a light receiving element.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the ratio of dimensions of each layer and each member is appropriately different from the actual one.
<A. First Embodiment>
FIG. 1 is a block diagram showing a configuration of the biometric authentication device 1 according to the first embodiment.
A biometric authentication device 1 shown in FIG. 1 is a device that captures a vein image of a finger F and performs personal authentication, and includes a sensing unit 2, a storage unit 40, a control unit 50, and an output unit 60. The sensing unit 2 includes a cover glass 10, a light emitting unit 20, and a light receiving unit 30. The cover glass 10 is a glass protective cover that covers the imaging region. On the cover glass 10, a finger F (for example, an index finger of the right hand) of a person to be authenticated is placed. The light emitting unit 20 includes, for example, a light emitting layer formed of an organic EL (Electro Luminescent) material, an anode, a cathode, and an insulating layer, and emits irradiation light IL that irradiates the finger F. The irradiation light IL is near-infrared light, and the wavelength thereof is, for example, 750 to 3000 nm (more preferably 800 to 900 nm).

  Irradiation light IL (near infrared light) emitted from the light emitting unit 20 is irradiated on the finger F from the lower side of the cover glass 10 and scattered when reaching the inside of the finger F, and a part thereof is received as reflected light RL. Head toward the part 30 side. Reduced hemoglobin flowing through veins has the property of absorbing near infrared light. For this reason, when the finger F is imaged using an image sensor for near infrared light, the vein portion under the finger F appears darker than the surrounding tissue. The pattern due to this difference in brightness becomes a vein image. The light receiving unit 30 is an image sensor for near infrared light, and includes a plurality of light receiving elements arranged in a matrix. Each light receiving element converts incident light (reflected light RL from the finger F) into an electric signal (light receiving signal) having a signal level corresponding to the amount of light.

  Although specific structures of the light emitting unit 20 and the light receiving unit 30 will be described later, the light emitting unit 20 and the light receiving unit 30 are the same with respect to the finger F placed on the cover glass 10 as shown in FIG. Located on the side (lower side in the figure). Further, the light emitting unit 20 is located on the cover glass 10 side (upper side in the drawing) than the light receiving unit 30.

  The storage unit 40 is a non-volatile memory such as a flash memory or a hard disk, and stores a vein image of a finger F registered in advance (for example, the index finger of the right hand) as a master vein image for personal authentication. The control unit 50 includes a CPU (Central Processing Unit) and a RAM (Random Access Memory), and controls turning on and off of the light emitting unit 20. In addition, the control unit 50 reads a light reception signal from each light receiving element included in the light receiving unit 30, and generates a vein image of the finger F based on the read light reception signal for one frame (for the imaging region). Further, the control unit 50 collates the generated vein image with the master vein image registered in the storage unit 40 and performs personal authentication. For example, the control unit 50 compares the characteristics of two vein images to be compared (for example, the number and position of branching veins), and if the similarity is equal to or higher than a predetermined threshold, The person who puts the finger F on is authenticated as the person whose master vein image is registered in the storage unit 40. The output unit 60 is, for example, a display unit or a voice notification unit, and notifies the authentication result by display or voice.

FIG. 2 is a cross-sectional view of the sensing unit 2.
In the figure, a plurality of light receiving elements D are arranged in a matrix on the upper surface of a light receiving unit 30 (image sensor for near infrared light). Each light receiving element D converts the reflected light RL (near infrared light) incident on the light receiving surface into a light receiving signal having a signal level corresponding to the light quantity. In addition, the counter substrate GS disposed to face the upper side of the light receiving unit 30 is formed of a material having high transparency to near infrared light, such as transparent glass or transparent plastic. Above the counter substrate GS, a lens array LA and a cover glass 10 are provided over the entire surface of the imaging region. The lens array LA and the cover glass 10 are made of a material that is highly transmissive to near infrared light. The lens array LA has a plurality of microlenses ML arranged in a matrix. The arrangement pitch of the microlenses ML is the same as the arrangement pitch of the light receiving elements D, and each microlens ML forms an image of the reflected light RL from the finger F on the light receiving surface of the light receiving element D located directly below.

  On the other hand, a light emitting unit 20 and a plurality of light shielding layers BM are provided below the counter substrate GS. First, the anode 22 is formed over the entire surface of the imaging region on the lower surface of the counter substrate GS. The anode 22 is a film body electrode (conductor) facing the cathode 24 across the organic EL layer 26 (or the light shielding layer BM, the insulating layer 28, and the organic EL layer 26), and transmits the near-infrared light. It is made of a highly conductive and highly conductive material. On the other hand, the cathode 24 is an electrode (conductor) provided with an opening at a position corresponding to each of the plurality of light receiving elements D, and is a material having a high light shielding property against near infrared light and a high conductivity. It is formed with. In addition, the lower side of the cathode 24 and each opening of the cathode 24 are covered with a sealing layer 29 made of a material that is highly transmissive to near infrared light. FIG. 3 is a plan view showing the arrangement of the cathode 24 and the light receiving element D. As shown in the figure, each opening provided in the cathode 24 has a square shape, and the cathode 24 has a cross-like shape when viewed from the cover glass 10 side. The arrangement pitch of the openings is the same as the arrangement pitch of the light receiving elements D, and the openings and the light receiving elements D (light receiving surfaces) have a one-to-one correspondence. In addition, one light receiving element D (light receiving surface) is included in each opening. The cathode 24 may be composed of a transparent electrode and a light shielding layer. That is, a transparent electrode in the form of a girder that is made of a material that is highly transmissive to near-infrared light and has high conductivity, and a girder-like transparent electrode that is made of a material that has a high light-shielding property to near-infrared light. The cathode 24 may be configured by overlapping the light shielding layer.

  Returning to FIG. 2, a light shielding layer BM is provided on the lower surface of the anode 22 at a position corresponding to each opening provided in the cathode 24. Each light shielding layer BM is formed of a material having a high light shielding property with respect to near-infrared light, and an opening is provided at a position corresponding to the light receiving surface of the light receiving element D. The center of the light receiving surface of each light receiving element D is included in the opening of the light shielding layer BM located directly above. Each light shielding layer BM (each opening) causes the reflected light RL that has passed through the microlens ML positioned directly above to be incident on the light receiving surface of the light receiving element D positioned directly below.

  Each light shielding layer BM is covered with an insulating layer 28 for each light shielding layer BM. Each insulating layer 28 is formed of a material having high transparency to near infrared light and high insulation. Each insulating layer 28 partially insulates the anode 22 and the cathode 24, and forms a non-light emitting region that does not emit near infrared light in the organic EL layer 26. Since each insulating layer 28 is provided at a position corresponding to each opening of the cathode 24, a position corresponding to the light receiving surface of each light receiving element D in the organic EL layer 26 and its periphery are set as non-light emitting regions. . That is, near-infrared light is emitted from the organic EL layer 26 on the optical path of the reflected light RL incident on the light receiving surface of each light receiving element D (on a straight line extending in the Z-axis direction from the light receiving surface of each light receiving element D). There is no light emitting area to perform.

  The organic EL layer 26 is a light emitting layer formed of an organic EL material having a high transmittance with respect to near-infrared light, and is formed over the entire imaging region. The organic EL layer 26 emits near-infrared light by combining holes and electrons by supplying current. Further, the organic EL layer 26 emits light at the portion sandwiched between the anode 22 and the cathode 24, but the portion where the insulating layer 28 is formed is insulated from the anode 22 and the cathode 24. Therefore, as shown in FIG. Of the layer 26, the hatched portion (the portion directly sandwiched between the anode 22 and the cathode 24) is a light emitting region that emits near infrared light, and the other portions are non-light emitting regions. Thus, the organic EL layer 26 has a light emitting region and a non-light emitting region. The light emitting region of the organic EL layer 26 is a portion indicated by hatching in FIG. 3 when viewed from the cover glass 10 side. As shown in the figure, since the light emitting region is formed so as to surround each light receiving element D, the finger F can be irradiated with near infrared light (irradiation light IR) with uniform intensity.

FIG. 4 is a schematic diagram showing the arrangement of each layer when focusing on one light receiving element D.
In the figure, the light receiving surface of the light receiving element D located at the lowermost layer has a circular shape. Further, a cathode 24 having a square opening larger than the light receiving surface of the light receiving element D is provided thereon. On the other hand, the anode 22 is provided over the entire uppermost layer, and a light shielding layer BM having a square outer shape larger than the opening of the cathode 24 is provided below the anode 22. A circular opening smaller than the light receiving surface of the light receiving element D is provided at the center of the light shielding layer BM, and portions other than the opening are shielded by the light shielding layer BM and the cathode 24. Thus, the light shielding layer BM and the cathode 24 cover a portion other than the opening of the light shielding layer BM and function as a light receiving window of the light receiving element D when viewed from the cover glass 10 side. An insulating layer 28 is provided under the light shielding layer BM. The insulating layer 28 has a larger outer shape (square) than the light shielding layer BM and covers the entire surface of the light shielding layer BM. An organic EL layer 26 is provided under the insulating layer 28 over the entire surface. The portion of the organic EL layer 26 that is sandwiched between the anode 22 and the cathode 24 and is not insulated by the insulating layer 28 emits light. Therefore, in the organic EL layer 26 shown in the figure, the peripheral portion indicated by hatching is a light emitting region, and the inner portion thereof is a non-light emitting region.

  As is apparent from FIG. 4, the position corresponding to the light receiving surface of the light receiving element D in the organic EL layer 26 and its periphery are non-light emitting regions. Therefore, on the optical path of the reflected light RL incident on the light receiving surface of the light receiving element D, there is no light emitting region that emits the irradiation light IL having a light amount larger than that of the reflected light RL. Further, since the light shielding layer BM and the cathode 24 shield the portions other than the opening of the light shielding layer BM, the reflected light RL transmitted through the microlens ML located right above is incident on the light receiving surface of the light receiving element D. Thus, the reflected light RL (scattered light) incident obliquely from the adjacent microlens ML or the like can be prevented from entering the light receiving surface of the light receiving element D.

Next, the operation of the biometric authentication device 1 will be described.
When the control unit 50 detects that the finger F is placed on the cover glass 10 by using a contact sensor or the like (not shown), the control unit 50 supplies current between the anode 22 and the cathode 24, and the organic EL layer 26 ( (Light emitting area) is turned on. Irradiation light IL (near infrared light) emitted from the organic EL layer 26 is irradiated onto the finger F through the anode 22, the counter substrate GS, the lens array LA, and the cover glass 10, and is scattered when reaching the inside of the finger F. A part of the light travels toward the light receiving unit 30 as reflected light RL. Further, a part of the reflected light RL from the finger F includes a cover glass 10, a lens array LA, a counter substrate GS, an anode 22, an opening of a light shielding layer BM, an insulating layer 28, an organic EL layer 26 (non-light emitting region), The light is incident on the light receiving surface of the light receiving element D through the opening of the cathode 24 and the sealing layer 29. Each light receiving element D converts the reflected light RL incident on the light receiving surface into a light receiving signal having a signal level corresponding to the amount of light. The control unit 50 reads a light reception signal from each light receiving element D, and generates a vein image of the finger F based on the read light reception signal for one frame. Further, the control unit 50 collates the generated vein image with the master vein image registered in the storage unit 40 to perform personal authentication, and outputs an authentication result from the output unit 60.

  As described above, according to the present embodiment, the position corresponding to the light receiving surface of each light receiving element D in the organic EL layer 26 and its periphery are non-light emitting regions. Therefore, on the optical path of the reflected light RL incident on the light receiving surface of each light receiving element D, there is no light emitting region that emits the irradiation light IL having a light amount larger than that of the reflected light RL. Further, the portions other than the openings of the respective light shielding layers BM are shielded from light by the respective light shielding layers BM and the cathodes 24. Therefore, the reflected light RL that has passed through the microlens ML located directly above is incident on the light receiving surface of each light receiving element D, and the reflected light RL (scattered light) that is incident obliquely from the adjacent microlens ML or the like. Incident can be suppressed. In addition, the irradiation light IL emitted from the organic EL layer 26 (light emitting region) is prevented from directly entering the light receiving surface of each light receiving element D through the opening of the cathode 24 by the cathode 24 and each light shielding layer BM. Can do. Therefore, each light receiving element D can receive the reflected light RL from the finger F with high accuracy, so that the imaging accuracy of the vein image can be increased. Moreover, although it is necessary to provide the anode 22, the cathode 24, the organic EL layer 26, the insulating layer 28, and the light shielding layer BM, each of these elements can be formed extremely thin, so that the invention described in Patent Document 1 is used. In comparison, the thickness of the biometric authentication device 1 (sensing unit 2) in the Z-axis direction can be reduced.

<B. Second Embodiment>
In the first embodiment described above, one cathode 24 (FIG. 3) having a plurality of openings may be a plurality of cathodes 24 ′ arranged apart from each other as shown in FIG. Each cathode 24 ′ has a strip shape extending in the Y-axis direction, and is arranged apart from each other so as not to overlap the plurality of light receiving elements D provided in the light receiving unit 30. In this case, each light shielding layer BM and each insulating layer 28 in the first embodiment also needs to be modified in outer shape or the like so as to cover the separation region between the adjacent cathodes 24 ′ in FIG.

FIG. 6 is a schematic diagram showing the arrangement of each layer in the second embodiment.
The light receiving element D and the anode 22 are the same as those described in the first embodiment. As shown in the figure, the two cathodes 24 ′ extending in the Y-axis direction are positioned on both sides (left and right in the figure) with the light receiving surface of the light receiving element D in between. When the separation width of the two cathodes 24 ′ is W1, the width W2 in the X-axis direction of the light shielding layer BM ′ is larger than W1. The light shielding layer BM ′ has a belt-like outer shape extending in the Y-axis direction. The light shielding layer BM ′ has a circular opening smaller than the light receiving surface at a position corresponding to the light receiving surface of the light receiving element D. As shown in FIG. 5, since a plurality of light receiving elements D are arranged along the Y-axis direction, a plurality of openings are formed along the Y-axis direction in each light shielding layer BM ′.

  Further, the width W3 in the X-axis direction of the insulating layer 28 'is larger than the width W2 of the light shielding layer BM'. The insulating layer 28 ′ also has a strip-like outer shape extending in the Y-axis direction, like the light shielding layer BM ′. The insulating layer 28 ′ and the light shielding layer BM ′ cover a separation area between the two cathodes 24 ′, and both ends (X-axis direction) of the insulating layer 28 ′ and the light shielding layer BM ′ overlap with the adjacent cathodes 24 ′. Further, although the organic EL layer 26 'is distributed over the entire surface, the portion sandwiched between the anode 22' and the cathode 24 'and not insulated by the insulating layer 28' emits light. Accordingly, as shown in the figure, the both side portions indicated by hatching in the organic EL layer 26 ′ become the light emitting region, and the inner portion thereof becomes the non-light emitting region. In the present embodiment, current is simultaneously supplied to the plurality of cathodes 24 ′. Therefore, the light emitting region of the organic EL layer 26 ′ is a portion indicated by hatching in FIG. 5 when viewed in plan from the cover glass 10 side.

  Even in the above configuration, the position corresponding to the light receiving surface of each light receiving element D in the organic EL layer 26 ′ and the periphery thereof are non-light emitting regions. Therefore, on the optical path of the reflected light RL incident on the light receiving surface of each light receiving element D, there is no light emitting region that emits the irradiation light IL having a light amount larger than that of the reflected light RL. Further, the light shielding layer BM 'and the two cathodes 24' on both sides of the light shielding layer BM 'shield light from portions other than the opening. Therefore, the reflected light RL that has passed through the microlens ML located directly above is incident on the light receiving surface of each light receiving element D. Therefore, the same effects as those of the first embodiment are obtained.

<C. Third Embodiment>
In the first embodiment described above, in addition to the cathode 24, the anode 22 may also be a plurality of anodes 22 ′ arranged apart from each other as shown in FIG. Each anode 22 ′ has a belt-like shape extending in the X-axis direction, and is disposed apart from each other so as not to overlap with the plurality of light receiving elements D provided in the light receiving unit 30.

FIG. 8 is a schematic diagram showing the arrangement of each layer in the third embodiment.
The light shielding layer BM ′, the insulating layer 28 ′, the cathode 24 ′, and the light receiving element D are the same as those described in the second embodiment. As shown in the figure, the two anodes 22 ′ extending in the X-axis direction are positioned on both sides (upper and lower sides in the figure) across the light receiving surface of the light receiving element D. Further, the separation width between the anodes 22 'is the same W1 as the separation width between the cathodes 24'. The organic EL layer 26 'is distributed over the entire surface, but a portion sandwiched between the anode 22' and the cathode 24 'and not insulated by the insulating layer 28' emits light. Therefore, as shown in the figure, the hatched four corners of the organic EL layer 26 'are light emitting regions, and the other portions are non-light emitting regions. In the present embodiment, current is simultaneously supplied to the plurality of anodes 22 ′ and the plurality of cathodes 24 ′. Accordingly, the light emitting region of the organic EL layer 26 ′ is a portion indicated by hatching in FIG. 7 when viewed from the cover glass 10 side.

  Even in the above configuration, the position corresponding to the light receiving surface of each light receiving element D in the organic EL layer 26 ′ and the periphery thereof are non-light emitting regions. Further, the light shielding layer BM 'and the two cathodes 24' on both sides of the light shielding layer BM 'shield light from portions other than the opening. Therefore, the same effects as those of the first embodiment are obtained.

<D. Fourth Embodiment>
By the way, the reflected light RL incident on the light receiving surface of each light receiving element D includes light reflected by the surface (skin) of the finger F. Such surface reflected light reduces the imaging accuracy of the vein image. Therefore, in the present embodiment, a biometric authentication device that can prevent a reduction in imaging accuracy due to surface reflected light will be described.

FIG. 9 is a diagram illustrating a circuit configuration of the light emitting unit 20A of the biometric authentication device according to the fourth embodiment.
As shown in the figure, the light emitting section 20A is provided with an anode 22 covering the entire surface of the imaging region and n cathodes 24 _{1 to} 24 _n extending in the Y-axis direction. In the following description, when it is not necessary to distinguish each cathode, it is referred to as a cathode 24. In the present embodiment, the arrangement of the anode 22, the plurality of cathodes 24, the organic EL layer 26, the plurality of insulating layers 28, and the plurality of light shielding layers BM is the same as in the second embodiment described above. . Further, a cathode driving circuit 200 is provided in the light emitting unit 20A. The cathode driving circuit 200 sequentially selects one or a plurality of cathodes 24 that supply current from the _n cathodes 24 _{1 to} 24 _n in accordance with a clock signal and a control signal supplied from the control unit 50. That is, current is supplied between the one or more cathodes 24 selected by the cathode driving circuit 200 and the anode 22, and the organic EL layer 26 emits light. For example, when the cathode driving circuit 200 selects all the cathodes 24 _{1 to} 24 _n , the light emitting region of the organic EL layer 26 is a portion indicated by hatching in the drawing.

FIG. 10 is a diagram illustrating a circuit configuration of the light receiving unit 30.
As shown in the figure, in the imaging region S, n scanning lines extending in the Y direction and m readout lines extending in the X direction are formed, and at the intersection of the scanning lines and the readout lines. Correspondingly, m (row) × n (column) light receiving elements D _{11 to} D _mn are arranged. In addition, in the following description, when it is not necessary to distinguish each light receiving element in particular, it is described as a light receiving element D. The control unit 50 supplies a clock signal and a scanning control signal to the light receiving sensor scanning circuit 300. The control unit 50 supplies a clock signal and a control signal for reading control to the light receiving signal reading circuit 400. The light receiving sensor scanning circuit 300 sequentially selects m × n light receiving elements D arranged in a matrix using the scanning signals X1 to Xn. The light reception signal readout circuit 400 reads out the light reception signals Y1 to Ym from the light receiving elements D for one column (m pieces) sequentially selected by the light receiving sensor scanning circuit 300 through m readout lines and controls them. To the unit 50. Note that the circuit configuration of the light receiving unit 30 illustrated in FIG. 10 is not limited to the present embodiment, and is common to the respective embodiments.

FIG. 11 is a diagram for explaining a vein image generation operation.
The n cathodes 24 _{1 to} 24 _n are divided into a plurality of groups. In the example shown in the figure, it is divided into three groups. The first group includes a cathode 24 ₁ , a cathode 24 ₄ , a cathode 24 ₇ ..., And the second group includes a cathode 24 ₂ and a cathode 24. ₅ , cathodes 24 ₈ ..., And the third group includes cathodes 24 ₃ , cathodes 24 ₆ , cathodes 24 ₉ . The cathode driving circuit 200 sequentially selects _n cathodes 24 _{1 to} 24 _n for each group. In other words, in the example shown in the figure, the cathode driving circuit 200 selects the cathode 24 ₁ , the cathode 24 ₄ , the cathode 24 ₇ ... Belonging to the first group in the period T1, and the cathode 24 belonging to the second group in the period T2. ₂ , cathode 24 ₅ , cathode 24 ₈ ... Are selected in period T3, and cathode 24 ₃ , cathode 24 ₆ , cathode 24 ₉ .

In this case, in the period T1, portions of the organic EL layer 26 corresponding to the cathode 24 ₁ , the cathode 24 ₄ , the cathode 24 ₇ ... Emit light in a stripe shape, and in the period T2, the cathode 24 ₂ , The portions corresponding to the cathode 24 ₅ , cathode 24 ₈ ... Emit light in a stripe shape, and in the period T3, the portions corresponding to the cathode 24 ₃ , cathode 24 ₆ , cathode 24 ₉ . To do.

On the other hand, the light-receiving sensor scanning circuit 300 and the light-receiving signal readout circuit 400 are arranged so that all the light-receiving elements D (m × n) each time the cathode driving circuit 200 sequentially selects _n cathodes 24 _{1 to} 24 _n for each group. Read the received light signal. Therefore, the light receiving signal for one frame in the period T1, the light receiving signal for one frame in the period T2, and the light receiving signal for one frame in the period T3 are input to the control unit 50.

Incidentally, for example, if the cathode driving circuit 200 selects the cathode 24 _4, a portion corresponding to the cathode 24 ₄ of the organic EL layer 26 emits light in stripes, this time, on its both sides across the cathode 24 ₄ Since each of the two rows of light receiving elements D _{13 to} D _m3 and D _{14 to} D _m4 is located at a short distance from the light emitting region, the surface reflection reflected by the skin of the finger F on the reflected light RL incident on the light receiving surface. Light is included.

  Therefore, the control unit 50 removes the received light signal read from the light receiving element D located in the vicinity of each light emitting region in the period T1 from the received light signal for one frame in the period T1, and the rest is used for generating a vein image. The received light signal. That is, the control unit 50 detects each cathode 24 (each light emitting region) in the first column, the fourth column, the seventh column,... Selected by the cathode driving circuit 200 in the period T1 from the light reception signal for one frame in the period T1. ), The received light signals read from the light receiving elements D in the first, third, fourth, sixth, seventh,... Adjacent to both sides are removed, and the remaining second and fifth columns are removed. The received light signals read from the respective light receiving elements D in the eyes, the eighth column,.

  Further, the control unit 50 removes the received light signal read from the light receiving element D located in the vicinity of each light emitting region in the period T2 from the received light signal for one frame in the period T2, and the rest is used for generating a vein image. The received light signal. That is, the control unit 50 detects each cathode 24 (each light emitting region) in the second column, the fifth column, the eighth column,... Selected by the cathode driving circuit 200 in the period T2 from the light reception signal for one frame in the period T2. ), The received light signals read from the respective light receiving elements D in the first, second, fourth, fifth, seventh, eighth,... The received light signals read from the light receiving elements D in the 6th, 9th,..., Rows are used as the received light signals for vein image generation.

  Similarly, the control unit 50 removes the received light signal read from the light receiving element D located in the vicinity of each light emitting region in the period T3 from the received light signal for one frame in the period T3, and uses the rest for vein image generation. The received light signal. That is, the control unit 50 detects each cathode 24 (each light emitting region) in the third column, the sixth column, the ninth column,... Selected by the cathode driving circuit 200 in the period T3 from the light reception signal for one frame in the period T3. ), The received light signals read from the light receiving elements D in the second, third, fifth, sixth, eighth, ninth,... The received light signals read from the respective light receiving elements D in the fourth, fourth, seventh,... Are used as light reception signals for vein image generation.

  Thereafter, the control unit 50 receives light signals for vein image generation in the period T1 (light reception signals read from the light receiving elements D in the second column, the fifth column, the eighth column,...) And the vein image generation in the period T2. Light reception signals (light reception signals read from the respective light receiving elements D in the third, sixth, ninth,...) And light reception signals for generating vein images in the period T3 (first, fourth, and seventh columns). Are combined with the light receiving signals read from the light receiving elements D in the columns, and a vein image is generated. By combining the light reception signals for generating the vein images in the periods T1, T2, and T3 in this way, a vein image can be generated without using the light reception signal from the light receiving element D on which the surface reflected light is incident. Therefore, it is possible to prevent the imaging accuracy from being deteriorated due to the surface reflected light, and to improve the imaging accuracy of the vein image.

The n cathodes 24 _{1 to} 24 _n may be divided into three or more groups. For example, n cathodes 24 _{1 to} 24 _n are divided into four groups, the first group includes cathode 24 ₁ , cathode 24 ₅ , cathode 24 ₉ ..., And the first group includes cathode 24 ₂ , cathode 24 ₆ , cathode comprises 24 ₁₀ ... cathode 24 ₃ in the third group, the cathode 24 _7, includes a cathode 24 ₁₁ ... cathode 24 ₄ to the fourth group, the cathode 24 _8, cathode 24 ₁₂ ... may be configured to include a. In this case, for example, the control unit 50 receives one frame of light received when the cathode driving circuit 200 selects the cathodes 24 in the first column, the fifth column, the ninth column, etc. belonging to the first group. The first, fourth, fifth, eighth, ninth,... Light receiving elements D located on both sides of each cathode 24 (each light emitting region) selected by the cathode driving circuit 200 from the signal. The received light signals read from the light receiving elements D in the second, third, sixth, seventh,..., Remaining columns are used as the received light signals for vein image generation.

Further, the n cathodes 24 _{1 to} 24 _n may be divided into n groups. In this case, for example, the controller 50 is positioned next to the cathode 24 ₁ (light emitting region) from the light reception signal for one frame read out when the cathode driving circuit 200 selects the cathode 24 ₁ in the first column. The received light signal read from each light receiving element D in the first column is removed, and the received light signal read from each light receiving element D in the third and subsequent columns is removed, and from the remaining light receiving elements D in the second column. The read light reception signal is used as a light reception signal for vein image generation.

  Here, the reason why the light reception signal read from each light receiving element D in the first column is removed is to prevent a decrease in imaging accuracy due to the surface reflected light. On the other hand, the reason for removing the received light signals read from the light receiving elements D in the third and subsequent columns is, for example, that the light receiving elements D in the (n−1) th column and the nth column are far from the light emitting region. This is because the reflected light RL cannot be received, or even though the reflected light RL can be received, the reflected light RL is not at a level suitable for generating a vein image. As described above, the control unit 50 is positioned next to one or more cathodes 24 (light emitting regions) selected by the cathode driving circuit 200 when acquiring the light receiving signal for generating the vein image from the light receiving signal for one frame. In addition to the received light signal read from each light receiving element D, the received light signal read from each light receiving element D that is far from the light emitting region and cannot obtain the reflected light RL at a level suitable for generating a vein image is removed. Sometimes.

  In addition, as shown in FIG. 12, by providing two cathodes 24A and 24B having a comb-like shape, and disposing two rows of light receiving elements D in each separated region between the cathode 24A and the cathode 24B, One vein image can be generated from the light reception signals for two frames. Note that in the example shown in the figure, the cathode driving circuit 200 selects the cathode 24A in the period T1, and selects the cathode 24B in the period T2. In the period T1, a part of the organic EL layer 26 that overlaps the cathode 24A (a region indicated by a dotted line in the drawing) emits light, and in the period T2, a part of the organic EL layer 26 that overlaps the cathode 24B. (A region indicated by a dotted line in the figure) emits light.

  In this case, the control unit 50 reads out from the light receiving signals for one frame in the period T1 from the light receiving elements D in the second column, the third column, the sixth column, the seventh column, ... adjacent to the cathode 24A. The received light signals are removed, and the remaining received light signals from the first, fourth, fifth, eighth,... Light receiving elements D are used as the received light signals for vein image generation. Further, the control unit 50 receives light received from the light receiving elements D in the first column, the fourth column, the fifth column, the eighth column,... Located on both sides of the cathode 24B from the light reception signal for one frame in the period T2. The signal is removed, and the remaining light receiving signals read from the light receiving elements D in the second column, the third column, the sixth column, the seventh column,... Are used as the received light signals for vein image generation.

  In addition, the control unit 50 receives light signals for vein image generation in the period T1 (light reception signals read from the respective light receiving elements D in the first column, the fourth column, the fifth column, the eighth column,...) And the period T2. A light reception signal for generating a vein image (light reception signals read from the light receiving elements D in the second column, the third column, the sixth column, the seventh column,...) Is synthesized to generate a vein image. Also in this case, since the vein image can be generated without using the light receiving signal from the light receiving element D on which the surface reflected light is incident by synthesizing the light receiving signal for generating the vein image in the periods T1 and T2. It is possible to prevent the imaging accuracy from being lowered due to the surface reflected light, and to improve the imaging accuracy of the vein image. Further, since one vein image can be generated from the light reception signals for two frames, the time required for generating the vein image can be shortened and the power consumption required for generating the vein image can be reduced compared to the case of FIG. Can be reduced.

  In addition, when the received light signal is read using the received light sensor scanning circuit 300 and the received light signal reading circuit 400, only the received light signal for vein image generation may be read. For example, in the case of the example shown in FIG. 11, the light receiving sensor scanning circuit 300 and the light receiving signal readout circuit 400 are arranged in the first column, the fourth column, the seventh column, etc. selected by the cathode driving circuit 200 in the period T1. The first, third, fourth, sixth, seventh,... Light receiving elements D located on both sides of each cathode 24 (each light emitting region) are excluded from the reading target, and the remaining 2 A light reception signal is read from each light receiving element D in the column, the fifth column, the eighth column,.

  In addition, the light receiving sensor scanning circuit 300 and the light receiving signal reading circuit 400 are provided for each cathode 24 (each light emitting region) in the second column, the fifth column, the eighth column,... Selected by the cathode driving circuit 200 in the period T2. The first, second, fourth, fifth, seventh, eighth,... Light receiving elements D located on both sides are excluded from the readout target, and the remaining third, sixth, and sixth columns. The light reception signal is read out from each light receiving element D in the ninth, ninth row,. Similarly, in the light receiving sensor scanning circuit 300 and the light receiving signal readout circuit 400, the cathode 24 (each light emitting region) in the third column, the sixth column, the ninth column, etc. selected by the cathode driving circuit 200 in the period T3. , The second, third, fifth, sixth, eighth, ninth,... Light receiving elements D located on both sides of the first and fourth columns are excluded from the readout target. A light reception signal is read from each light receiving element D in the column, the seventh column, and so on.

  The control unit 50 combines the light reception signal read in the period T1, the light reception signal read in the period T2, and the light reception signal read in the period T3 to generate a vein image. Also in this case, the vein image can be generated without using the light reception signal from the light receiving element D on which the surface reflected light is incident, so that the imaging accuracy due to the surface reflected light is prevented from being lowered and the imaging accuracy of the vein image is increased. be able to. In addition, since the number of scans in the light receiving sensor scanning circuit 300 and the number of light reception signal readouts in the light reception signal readout circuit 400 can be reduced, power consumption can also be reduced.

<E. Fifth Embodiment>
In the fourth embodiment described above, it is possible to select not only the cathodes 24 _{1 to} 24 _n but also the anode 22 as a plurality of anodes spaced apart from each other, and to select an anode that supplies current.

FIG. 13 is a diagram illustrating a circuit configuration of the light emitting unit 20B of the biometric authentication device according to the fifth embodiment. As shown in the figure, the light emitting section 20B is provided with m anodes 22 _{1 to} 22 _m extending in the X-axis direction and n cathodes 24 _{1 to} 24 _n extending in the Y-axis direction. Yes. In the following description, each anode is referred to as an anode 22 when it is not necessary to distinguish between the anodes. In the present embodiment, the arrangement of the plurality of anodes 22, the plurality of cathodes 24, the organic EL layer 26, the plurality of insulating layers 28, and the plurality of light shielding layers BM is the same as that in the third embodiment described above. It is.

In addition to the cathode driving circuit 200 described in the fourth embodiment, an anode driving circuit 250 is provided in the light emitting unit 20B. The anode drive circuit 250 sequentially selects one or a plurality of anodes 22 that supply current from the _m anodes 22 _{1 to} 22 _m in accordance with a clock signal and a control signal supplied from the control unit 50. That is, current is supplied between the one or more anodes 22 selected by the anode driving circuit 250 and the one or more cathodes 24 selected by the cathode driving circuit 200, and the organic EL layer 26 emits light. For example, when the anode drive circuit 250 selects all the anodes 22 _{1 to} 22 _m and the cathode drive circuit 200 also selects all the cathodes 24 _{1 to} 24 _n , the light emitting region of the organic EL layer 26 is It becomes a part shown by hatching in the figure. The circuit configuration of the light receiving unit 30 in the present embodiment may be the same as that in the fourth embodiment (FIG. 10).

FIG. 14 is a diagram for explaining a vein image generation operation.
The m anodes 22 _{1 to} 22 _m and the n cathodes 24 _{1 to} 24 _n are divided into a plurality of groups. In the example shown in the figure, it is divided into three groups, and the first group includes all the cathodes 24 _{1 to} 24 _n , the anode 22 ₁ , the anode 22 ₄ , the anode 22 ₇ . The second group includes all the cathodes 24 _{1 to} 24 _n , the anode 22 ₂ , the anode 22 ₅ , the anode 22 ₈ . The third group includes all the cathodes 24 _{1 to} 24 _n , the anode 22 ₃ , the anode 22 ₆ , the anode 22 ₉ .

The cathode driving circuit 200 sequentially selects _n cathodes 24 _{1 to} 24 _n for each group. In the example shown in the figure, since all the cathodes 24 _{1 to} 24 _n belong to all the groups, the cathode driving circuit 200 selects all the cathodes 24 _{1 to} 24 _n in all the periods T1 to T3. Will do. The anode driving circuit 250 sequentially selects _m anodes 22 _{1 to} 22 _m for each group. In other words, in the example shown in the figure, the anode driving circuit 250 selects the anode 22 ₁ , the anode 22 ₄ , the anode 22 ₇ ... Belonging to the first group in the period T1, and the anode 22 belonging to the second group in the period T2. ₂ , anode 22 ₅ , anode 22 ₈ ... Are selected in period T 3 and anode 22 ₃ , anode 22 ₆ , anode 22 ₉ ... Belonging to the third group are selected.

In this case, in the period T1, a part of the organic EL layer 26 where all the cathodes 24 _{1 to} 24 _n overlap with the anode 22 ₁ , the anode 22 ₄ , the anode 22 ₇ . Emits light. In the period T2, a part of the organic EL layer 26 where all the cathodes 24 _{1 to} 24 _n overlap with the anode 22 ₂ , the anode 22 ₅ , the anode 22 ₈ . Emits light. Further, in the period T3, a part of the portion of the organic EL layer 26 where all the cathodes 24 _{1 to} 24 _n overlap with the anode 22 ₃ , the anode 22 ₆ , the anode 22 ₉ . Emits light.

  On the other hand, the light receiving sensor scanning circuit 300 and the light receiving signal reading circuit 400 read the light receiving signals from all the light receiving elements D (m × n) each time the cathode driving circuit 200 and the anode driving circuit 250 perform selection in units of groups. Therefore, the light receiving signal for one frame in the period T1, the light receiving signal for one frame in the period T2, and the light receiving signal for one frame in the period T3 are input to the control unit 50.

  The control unit 50 removes the light reception signal read from the light receiving element D located in the vicinity of each light emitting region in the period T1 from the light reception signal for one frame in the period T1, and the remaining light reception signal for generating a vein image And That is, the control unit 50 is adjacent to the anodes 22 in the first row, the fourth row, the seventh row,... Selected by the anode driving circuit 250 in the period T1 from the light reception signal for one frame in the period T1 (see FIG. The received light signals read from the respective light receiving elements D in the first, third, fourth, sixth, seventh,. The received light signals read from the respective light receiving elements D in the eyes, the eighth row, and so on are used as the received light signals for vein image generation.

  Further, the control unit 50 removes the received light signal read from the light receiving element D located in the vicinity of each light emitting region in the period T2 from the received light signal for one frame in the period T2, and the rest is used for generating a vein image. The received light signal. That is, the control unit 50 is adjacent to each anode 22 in the second row, the fifth row, the eighth row,... Selected by the anode driving circuit 250 in the period T2 from the light reception signal for one frame in the period T2 (see FIG. The received light signals read from the respective light receiving elements D in the first row, the second row, the fourth row, the fifth row, the seventh row, the eighth row,. The received light signals read from the respective light receiving elements D in the 6th, 6th, 9th, etc. lines are used as received light signals for vein image generation.

  Similarly, the control unit 50 removes the received light signal read from the light receiving element D located in the vicinity of each light emitting region in the period T3 from the received light signal for one frame in the period T3, and uses the rest for vein image generation. The received light signal. That is, the control unit 50 is adjacent to the anodes 22 in the third row, the sixth row, the ninth row,... Selected by the anode drive circuit 250 in the period T3 from the light reception signal for one frame in the period T3 (see FIG. The received light signals read from the respective light receiving elements D in the second, third, fifth, sixth, eighth, ninth,... The received light signals read from the respective light receiving elements D in the 4th, 4th, 7th rows, and so on are used as received light signals for vein image generation.

  Thereafter, the control unit 50 receives a light reception signal for generating a vein image in the period T1 (light reception signals read from the respective light receiving elements D in the second row, the fifth row, the eighth row,...) And the vein image generation in the period T2. Light reception signals (light reception signals read from the respective light receiving elements D in the third, sixth, ninth,...) And light reception signals for generating vein images in the period T3 (first, fourth, seventh). Are combined with the light receiving signals read from the respective light receiving elements D in the row... To generate a vein image. Even with the configuration described above, a vein image is generated without using the light receiving signal from the light receiving element D on which the surface reflected light is incident by synthesizing the light receiving signals for generating the vein images in the periods T1, T2, and T3. Therefore, the same effect as in the fourth embodiment can be obtained.

As in the fourth embodiment, in this embodiment, m anodes 22 _{1 to} 22 _m and n cathodes 24 _{1 to} 24 _n may be divided into three or more groups. The control unit 50 selects one or more anodes 22 selected by the anode driving circuit 250 and the cathode driving circuit 200 when acquiring a light receiving signal for generating a vein image from the light receiving signals for one frame. In addition to the received light signal read from each light receiving element D located in the vicinity of the portion where the one or more cathodes 24 overlapped (light emitting region), the distance from the light emitting region is long and suitable for the generation of vein images. You may remove the light reception signal read from each light receiving element D which cannot obtain reflected light RL.

  In addition, when the received light signal is read using the received light sensor scanning circuit 300 and the received light signal reading circuit 400, only the received light signal for vein image generation may be read. For example, in the case of the example shown in FIG. 14, the light receiving sensor scanning circuit 300 and the light receiving signal readout circuit 400 have the first row, the fourth row, the seventh row, etc. selected by the anode driving circuit 250 in the period T1. The first, third, fourth, sixth, seventh,... Light receiving elements D located on both sides (upper and lower in the figure) of each anode 22 are excluded from the reading target, and the remaining 2 A light reception signal is read from each light receiving element D in the row, the fifth row, the eighth row, and so on.

  Further, the light receiving sensor scanning circuit 300 and the light receiving signal reading circuit 400 are adjacent to the anodes 22 in the second row, the fifth row, the eighth row,. 1), 2nd line, 4th line, 5th line, 7th line, 8th line, etc., are excluded from the reading target, and the remaining 3rd line, 6th line The received light signal is read from each of the light receiving elements D in the 9th row, the 9th row, and so on. Similarly, the light receiving sensor scanning circuit 300 and the light receiving signal readout circuit 400 are adjacent to the anodes 22 in the third row, the sixth row, the ninth row,... Selected by the anode driving circuit 250 in the period T3 (in the drawing). The second, third, fifth, sixth, eighth, ninth,... Light receiving elements D positioned on the upper and lower sides are excluded from the reading target, and the remaining first and fourth lines 4 A light reception signal is read from each light receiving element D in the row, the seventh row, and so on.

  The control unit 50 combines the light reception signal read in the period T1, the light reception signal read in the period T2, and the light reception signal read in the period T3 to generate a vein image. Also in this case, the vein image can be generated without using the light reception signal from the light receiving element D on which the surface reflected light is incident, so that the imaging accuracy due to the surface reflected light is prevented from being lowered and the imaging accuracy of the vein image is increased. be able to. In addition, since the number of scans in the light receiving sensor scanning circuit 300 and the number of light reception signal readouts in the light reception signal readout circuit 400 can be reduced, power consumption can also be reduced.

<F. Sixth Embodiment>
In each of the above-described embodiments, the case where the present invention is applied to a biometric authentication apparatus has been described. However, the present invention can also be applied to an image scanner that reads an image such as a document. In this case, visible light is used as the irradiation light IL and the reflected light RL instead of near infrared light. That is, the light emitting unit 20 (organic EL layer 26) emits visible light instead of near infrared light as the irradiation light IL, and the light receiving unit 30 (each light receiving element D) emits near infrared light as the reflected light RL. Instead, it receives visible light. Further, the cover glass 10, the lens array LA, the counter substrate GS, the anode 22, the insulating layer 28, the organic EL layer 26, and the sealing layer 29 are formed of a material that is highly transmissive to visible light, and the cathode 24 and the light shield. The layer BM is formed of a material having a high light blocking property with respect to visible light.

By the way, when the image scanner to which the present invention is applied includes the light emitting unit 20A shown in FIG. 9 and the light receiving unit 30 shown in FIG. 10, the irradiation light depends on the size and position of the document placed on the imaging region S. The power consumption can be reduced by defining the light emission range of the IL and the read range of the received light signal. For example, consider a case where a document M is placed on the imaging region S as shown in FIG. In the imaging region S, it is assumed that one anode 22 covering the entire surface and 240 cathodes 24 _{1 to} 24 ₂₄₀ extending in the Y-axis direction are provided. In the imaging region S, 180 (row) × 240 (column) light receiving elements D _{11 to} D _180,240 are arranged in a matrix.

In this case, the image scanner first performs pre-scanning to detect the size and position of the document M placed on the imaging area S. Note that the pre-scan is to scan the document M at a coarser resolution than the main scan before the main scan. For example, when performing pre-scanning, the cathode drive circuit 200 selects the cathode 24 ₁₀ , the cathode 24 ₂₀ , the cathode 24 ₃₀ ,..., The cathode 24 ₂₄₀ from the ₂₄₀ cathodes 24 _{1 to} 24 ₂₄₀ . That is, the cathode drive circuit 200 selects the cathode 24 at a rate of one for every ten. Thus, when pre-scanning is performed, current is supplied between the total of 24 cathodes 24 selected by the cathode driving circuit 200 and the anode 22, and the organic EL layer 26 emits light.

In addition, the light receiving sensor scanning circuit 300 and the light receiving signal readout circuit 400, when performing pre-scan, for example, receive light receiving signals from the light receiving elements D in the 10th, 20th, 30th,... 240th columns. read out. The light receiving sensor scanning circuit 300 and the light receiving signal readout circuit 400 also perform the 10th row, the 20th row, the 30th row,. The light reception signal can be read out by performing thinning as appropriate. Further, the control unit 50 detects an area where the document M is placed based on each light reception signal read out by the pre-scan. For example, in the case of FIG. 15A, the area where the document M is placed is in the range from the first column to the 180th column in the X-axis direction and in the range from the first row to the 120th row in the Y-axis direction. It is detected that there is. When the area where the document M is placed is detected in this way, the control unit 50 determines the emission range LA of the irradiation light IL and the read range RA of the received light signal when performing the main scan according to the detected area. .

For example, in the case of FIG. 15A, the emission range LA of the irradiation light IL and the readout range RA of the received light signal can be determined as a range indicated by a one-dot chain line in the drawing. In this case, the control unit 50 determines the cathodes 24 _{1 to} 24 ₁₈₀ as the cathodes 24 selected by the cathode driving circuit 200 when performing the main scan. In addition, the control unit 50 performs a total of 32400 light receiving elements D from the first column to the 180th column as the light receiving elements D from which the light receiving sensor scanning circuit 300 and the light receiving signal reading circuit 400 read out the received light signals when performing the main scan. _{11 to} D _180,180 .

Accordingly, in the main scan, the cathode driving circuit 200 selects the cathodes 24 _{1 to} 24 ₁₈₀ , so that the organic EL layer 26 does not need to emit light for the portions corresponding to the cathodes 24 _{181 to} 24 ₂₄₀ . In the main scan, the light receiving sensor scanning circuit 300 and the light receiving signal reading circuit 400 read the light receiving signals from a total of 32400 light receiving elements D _{11 to} D _180,180 from the first column to the _180th column. For a total of 10800 light receiving elements D _{1,181 to} D _180,240 up to the row, it is not necessary to read out the light receiving signals. Therefore, the power consumption of the image scanner can be reduced.

In the case of FIG. 15A, the control unit 50 selects the light receiving elements D from which the light receiving sensor scanning circuit 300 and the light receiving signal reading circuit 400 read the received light signals in the first to 180th columns when performing the main scan. In addition, a total of 21,600 light receiving elements D _{11 to} D _120,180 from the first line to the 120th line can be determined. In this case, the read range RA of the received light signal can be narrowed, so that the power consumption can be further reduced.

Further, when the image scanner to which the present invention is applied includes the light emitting unit 20B illustrated in FIG. 13 and the light receiving unit 30 illustrated in FIG. 10, the image scanner also depends on the size and position of the document placed on the imaging region S. By determining the light emission range LA of the irradiation light IL and the light reception signal readout range RA, the power consumption can be reduced. For example, consider a case where a document M is placed on the imaging region S as shown in FIG. In the imaging region S, 180 anodes 22 _{1 to} 22 ₁₈₀ extending in the X-axis direction and 240 cathodes 24 _{1 to} 24 ₂₄₀ extending in the Y-axis direction are provided. In the imaging region S, 180 (row) × 240 (column) light receiving elements D _{11 to} D _180,240 are arranged in a matrix.

Also in this case, the image scanner performs pre-scanning to detect the size and position of the document M placed on the imaging area S. For example, the cathode drive circuit 200 selects the cathode 24 ₁₀ , the cathode 24 ₂₀ , the cathode 24 ₃₀ ,..., The cathode 24 ₂₄₀ when performing the pre-scan as described above. Further, when performing the pre-scan, the anode driving circuit 250 selects, for example, the anode 22 ₁₀ , the anode 22 ₂₀ , the anode 22 ₃₀ ,... The anode 22 ₁₈₀ from the ₁₈₀ anodes 22 _{1 to} 22 ₁₈₀ . That is, for the anode drive circuit 250, the anode 22 is selected at a rate of one for every ten. Thus, when pre-scanning is performed, current is supplied between the total of 18 anodes 22 selected by the anode drive circuit 250 and the total of 24 cathodes 24 selected by the cathode drive circuit 200. The EL layer 26 emits light.

  Further, the light receiving sensor scanning circuit 300 and the light receiving signal readout circuit 400, when performing pre-scanning, scan lines in the 10th column, 20th column, 30th column,... 240th column, 10th row, 20th row. The received light signals are read from a total of 432 light receiving elements D at positions where the readout lines of the 20th, 30th,. Further, the control unit 50 detects a region where the document M is placed based on each light reception signal read by the pre-scan, and the light emission range LA and the light reception when the main scan is performed according to the detected region. A signal readout range RA is determined.

For example, in the case of FIG. 15B, the emission range LA of the irradiation light IL and the readout range RA of the received light signal can be determined to be a range indicated by a one-dot chain line in the drawing. In this case, the control unit 50 determines the cathodes 24 _{1 to} 24 ₁₈₀ as the cathodes 24 selected by the cathode driving circuit 200 when performing the main scan. Further, the control unit 50 determines the anodes 22 _{1 to} 22 ₁₂₀ as the anodes 22 selected by the anode drive circuit 250 when performing the main scan. In addition, the control unit 50 selects the light receiving elements D from which the light receiving sensor scanning circuit 300 and the light receiving signal reading circuit 400 read the light receiving signals in the first to 180th columns and the first to 120th rows when performing the main scan. A total of 21600 light receiving elements D _{11 to} D _{120,180 up} to the _eyes are determined.

Accordingly, in this scan, the cathode driving circuit 200 selects the cathodes 24 _{1 to} 24 ₁₈₀ and the anode driving circuit 250 selects the anodes 22 _{1 to} 22 ₁₂₀ , so that the portion corresponding to the cathodes 24 _{181 to} 24 ₂₄₀ and the anode 22 _The portions corresponding to _{121 to} 22 ₁₈₀ need not emit light from the organic EL layer 26. Further, in the main scan, the light receiving sensor scanning circuit 300 and the light receiving signal reading circuit 400 are composed of a total of 21,600 light receiving elements D _{11 to} D _{120,180 in the first} to _180th columns and the first to 120th rows. Since the light reception signals are read, it is not necessary to read the light reception signals for the light reception elements D in the 181st to 240th columns and the light reception elements D in the 121st to 180th rows (21600 in total). Therefore, as compared with the case of FIG. 15A, the light emission range LA of the irradiation light IL and the read range RA of the received light signal can be narrowed, so that the power consumption can be further reduced.

  When the main scan is performed after the pre-scan is performed and the light emission range LA of the irradiation light IL and the light-receiving signal readout range RA are determined, the influence of the surface reflected light described in the fourth and fifth embodiments described above. By performing driving (light emission control and readout control) to eliminate the above, it is possible to improve the imaging accuracy of the vein image. Further, for example, as shown in FIG. 16, the imaging area S is divided into 12 divided areas S1 to S12 in advance, and as a result of performing the pre-scan, the area where the document M is placed is divided areas S1 to S3. In the case of S5 to S7, the emission range LA of the irradiation light IR and the light reception signal readout range RA are divided into divided regions S1 to S3, S5 to S7, and S9 to S11 (or divided regions S1 to S3, S5 to S7). It may be determined and the main scan may be performed.

  Also in the biometric authentication device, the pre-scan is performed to detect the region where the finger F is placed in the imaging region S, and the light emission range LA and the light reception when the main scan is performed according to the detected region. By determining the signal readout range RA, power consumption can be reduced.

<G. Modification>
The present invention is not limited to the above-described embodiments, and for example, the following modifications are possible. Also, two or more of the following modifications can be combined as appropriate.

[Modification 1]
For example, in order to correct the change in the photoelectric conversion characteristics of the light receiving element D due to the amount of received light (integrated amount), or to obtain the value of the received light signal in a state where no reflected light RL is incident as a reference value, A light receiving element D in which the upper side of the light receiving surface is completely covered with the light shielding layer BM may be provided at the end or the like. As described above, the structure according to the present invention is not necessarily applied to all the light receiving elements D, and the structure according to the present invention may be applied to at least one light receiving element D. That is, in the case of the first embodiment, at least one or more openings of the cathode 24, the light receiving element D, the light shielding layer BM (opening), and the insulating layer 28 may be provided. In the second embodiment, at least two cathodes 24 ′ may be provided, and at least one light receiving element D, light shielding layer BM ′ (opening), and insulating layer 28 ′ may be provided.

[Modification 2]
The light shielding layer BM may be formed of a member having a high light shielding property with respect to near infrared light and a high insulating property. The light shielding layer BM and the cathode 24 are preferably formed of a material having low reflectivity with respect to near infrared light. Further, as shown in FIG. 17, the light shielding layer BM and the insulating layer 28 may be provided below the organic EL layer 26. In this configuration, a second insulating layer may also be provided on the upper side of the organic EL layer 26. Further, as shown in FIG. 18, a light shielding layer BM may be provided on the lower surface of the counter substrate GS. Further, the polarity of the anode 22 and the cathode 24 may be reversed. In addition to the organic EL layer 26, the light emitting layer may include a hole transport layer, a hole injection layer, an electron transport layer, an electron injection layer, and the like. The light emitting layer is not an organic EL material. It may be formed of an inorganic EL material or a light emitting polymer. Further, the light emitting layer may be a voltage driven type that emits light by application of a voltage. In addition, the shape of the light receiving surface of the light receiving element D and the opening of the light shielding layer BM is not limited to a circle, and may be an arbitrary shape such as an ellipse, a rectangle, or a hexagon. The shape of the opening of the cathode 24, the shape (outer shape) of the light shielding layer BM, and the shape (outer shape) of the insulating layer 28 are not limited to squares and rectangles, and may be arbitrary shapes. Further, the size of the light receiving surface of the light receiving element D and the size of the opening of the light shielding layer BM may be larger in the opening than in the light receiving surface, or both may be the same size. Further, when viewed in plan from the cover glass 10 side, it is desirable that the center (or the center of gravity) of the light receiving surface of the light receiving element D is located in the opening of the light shielding layer BM, but at least a part of the light receiving surface is located in the opening. If you do. Further, the arrangement pattern of the light receiving elements D and the openings is not limited to a matrix. For example, the light receiving elements D and the openings may be arranged so as to form a black or white arrangement pattern in a chess pattern (checkered pattern). Further, the present invention may be applied to a sweep-type biometric authentication device. In this case, for example, as shown in FIGS. 19A and 19B, the plurality of light receiving elements D may be arranged in a line along the X-axis direction. In this case, each light shielding layer BM only needs to have one opening. These modifications are applicable to the above-described embodiments.

[Modification 3]
The part of the living body subject to vein authentication may be the palm, the back of the hand, the eye, or the like. Further, a band pass filter (optical filter) that blocks light other than near infrared light may be provided. For example, the band pass filter can be provided between the counter substrate GS and the anode 22 or between the cover glass 10 and the lens array LA. In addition, the present invention can be applied to a biometric authentication device that uses visible light instead of near infrared light and performs biometric authentication based on fingerprints and irises. In this case, the light emitting unit 20 (organic EL layer 26) emits visible light as the irradiation light IL. In addition, the light receiving unit 30 (each light receiving element D) receives visible light as the reflected light RL. Further, the cover glass 10, the lens array LA, the counter substrate GS, the anode 22, the insulating layer 28, the organic EL layer 26, and the sealing layer 29 are formed of a material that is highly transmissive to visible light, and the cathode 24 and the light shield. The layer BM is formed of a material having a high light blocking property with respect to visible light. These modifications are applicable to each embodiment except for the sixth embodiment.

[Modification 4]
For example, the present invention can be applied to a personal computer or a mobile phone having a biometric authentication function. In addition to the image scanner, the present invention can also be applied to an image reading apparatus such as a copying machine, a facsimile, or a barcode reader. Note that when the present invention is applied to an image reading apparatus, visible light is used instead of near-infrared light as the irradiation light IL and the reflected light RL.

DESCRIPTION OF SYMBOLS 1 ... Biometric authentication apparatus (sensing apparatus), 2, 2A, 2B ... Sensing unit (sensing apparatus), 10 ... Cover glass, 20, 20A, 20B ... Light emitting part, 30 ... Light receiving part, 40 ... Memory | storage part, 50 ... Control Unit (control circuit, generation circuit), 60 ... output unit, F ... finger (object), IL ... irradiation light, RL ... reflected light, D, D _{11 to} D _mn ... light receiving element, GS ... counter substrate, 22, 22 ', 22 _{1 to} 22 _m ... anode (first electrode), 24, 24', 24 _{1 to} 24 _n , 24A, 24B ... cathode (second electrode, third electrode), 26, 26 '... organic EL layer (Light emitting layer), BM, BM '... light shielding layer, 28, 28' ... insulating layer, 29 ... sealing layer, LA ... lens array, ML ... microlens, 200 ... cathode drive circuit (first drive circuit), 250... Anode drive circuit (second drive circuit), 300... (Reading circuit), 400... Light receiving signal reading circuit (reading circuit), S... Imaging region (reading region), X1 to Xn... Scanning signal, Y1 to Ym. Object), LA ... light emission range, RA ... reading range, S1-S12 ... divided region.

Claims (14)

A light emitting unit, a light receiving unit , a light shielding layer, and a cover glass are provided, the living body placed on the cover glass is irradiated with near infrared light from the light emitting unit, and reflected light from the living body is received by the light receiving unit. In a vein image capturing apparatus that captures a vein image ,
The light emitting unit and the light receiving unit are provided on the same side with respect to the cover glass , the light emitting unit is located on the cover glass side from the light receiving unit,
The light emitting unit
A light- emitting layer that emits irradiated light ;
A first electrode located on the cover glass side of the light emitting layer and transmitting the irradiation light and the reflected light;
A second electrode that is located closer to the light receiving part than the light emitting layer, shields the irradiation light and the reflected light, and has a first opening formed thereon;
An insulating layer provided at a position corresponding to the first opening and transmitting the reflected light and partially insulating the first electrode and the second electrode;
The light receiving unit is
A light receiving element for receiving the reflected light;
The light shielding layer is
The first we provided at a position corresponding to the opening is, and the second opening is formed passing through the shields the illumination light the reflected light,
Wherein when viewed in plan from the cover glass side, the light shielding layer overlaps with the first opening, the vein image capturing apparatus characterized by a light receiving surface of the light receiving element is positioned within said second opening. A light emitting unit, a light receiving unit , a light shielding layer, and a cover glass are provided, the living body placed on the cover glass is irradiated with near infrared light from the light emitting unit, and reflected light from the living body is received by the light receiving unit. and, in have you the vein image capturing apparatus for capturing an image of veins,
The light emitting unit and the light receiving unit are provided on the same side with respect to the cover glass , the light emitting unit is located on the cover glass side from the light receiving unit,
The light emitting unit
A light- emitting layer that emits irradiated light ;
A first electrode located on the cover glass side of the light emitting layer and transmitting the irradiation light and the reflected light;
A second electrode and a third electrode, which are located closer to the light receiving part than the light emitting layer, shield the irradiation light and the reflected light, and are spaced apart from each other;
Provided at a position corresponding to a separation region between the second electrode and the third electrode, transmits the reflected light , and partially insulates the second electrode, the third electrode, and the first electrode And an insulating layer
The light receiving unit is
A light receiving element for receiving the reflected light;
The light shielding layer is
Provided at a position corresponding to the separation region, an opening that blocks the irradiation light and transmits the reflected light is formed,
When viewed in plan from the crystal side, the light shielding layer overlaps with the separation region, the vein image capturing apparatus characterized by a light receiving surface of the light receiving element is positioned in the opening. The vein image capturing apparatus according to claim 1, wherein the light shielding layer is provided between the first electrode and the second electrode from the cover glass side. A light emitting unit, a light receiving unit , a light shielding layer, and a cover glass are provided, the living body placed on the cover glass is irradiated with near infrared light from the light emitting unit, and reflected light from the living body is received by the light receiving unit. and, wherein the light emitting unit and the light receiving part have contact the vein image capturing apparatus for capturing an image of veins are provided on the same side with respect to the cover glass, the light-emitting portion is located on the crystal side from the light receiving unit,
The light emitting unit
A light- emitting layer that emits irradiated light ;
A first electrode located on the cover glass side of the light emitting layer and transmitting the irradiation light and the reflected light;
A plurality of second electrodes that are located closer to the light receiving part than the light emitting layer, shield the irradiation light and the reflected light, and are spaced apart from each other;
A plurality of insulating layers that are provided at positions corresponding to the separation regions for each separation region between the adjacent second electrodes, and that transmit the reflected light and partially insulate the first electrode and the second electrode. And
The light receiving unit is
A plurality of light receiving elements for receiving the reflected light;
Each of the plurality of light shielding layers is
One or more openings that are provided at positions corresponding to the different separation areas and shield the irradiation light and transmit the reflected light are formed,
When viewed in plan from the crystal side, each of said separation region overlaps with the light-shielding layer, the vein image captured in each of the said openings, characterized in that the light receiving surface of the light receiving element is positioned one Equipment . A light emitting unit, a light receiving unit , a light shielding layer, and a cover glass are provided, the living body placed on the cover glass is irradiated with near infrared light from the light emitting unit, and reflected light from the living body is received by the light receiving unit. and, wherein the light emitting unit and the light receiving part have contact the vein image capturing apparatus for capturing an image of veins are provided on the same side with respect to the cover glass, the light-emitting portion is located on the crystal side from the light receiving unit,
The light emitting unit
A light- emitting layer that emits irradiated light ;
A plurality of first electrodes that are located on the cover glass side of the light emitting layer and transmit the irradiation light and the reflected light and are spaced apart from each other;
A plurality of second electrodes that are located closer to the light receiving unit than the light emitting layer, shield the irradiation light and the reflected light, are provided apart from each other, and intersect the plurality of first electrodes;
A plurality of insulating layers that are provided at positions corresponding to the separation regions for each separation region between the adjacent second electrodes, and that transmit the reflected light and partially insulate the first electrode and the second electrode. And
The light receiving unit is
A plurality of light receiving elements for receiving the reflected light;
Each of the plurality of light shielding layers is
One or more openings that are provided at positions corresponding to the different separation areas and shield the irradiation light and transmit the reflected light are formed,
When viewed in plan from the crystal side, each of said separation region overlaps with the light-shielding layer, the vein image captured in each of the said openings, characterized in that the light receiving surface of the light receiving element is positioned one Equipment . A first drive circuit that selects a part of the second electrodes as a target for supplying a drive signal for causing the light emitting layer to emit light among the plurality of second electrodes;
Of the plurality of light receiving elements, when viewed in plan from the cover glass side, the reflection incident on the light receiving surface from the light receiving elements adjacent to a part of the second electrodes selected by the first drive circuit The vein image capturing apparatus according to claim 4, further comprising: a reading circuit that reads a light reception signal indicating the amount of light. A control circuit is provided that detects a region where the living body is placed in a reading region for reading a vein image of the living body and determines a part of the second electrodes selected by the first drive circuit based on a detection result. The vein image pickup apparatus according to claim 6. A first drive circuit that selects a part of the second electrodes as a target for supplying a drive signal for causing the light emitting layer to emit light among the plurality of second electrodes;
A second drive circuit that selects a part of the first electrodes as a target for supplying the drive signal among the plurality of first electrodes;
Among the plurality of light receiving elements, when viewed in plan from the cover glass side, a part of the second electrode selected by the first driving circuit and a part of the second driving circuit selected by the second driving circuit 6. The vein image pickup according to claim 5, further comprising: a readout circuit that reads a light reception signal indicating a light amount of the reflected light incident on the light receiving surface from the light receiving element adjacent to the portion where the first electrode overlaps. Equipment . An area where the living body is placed is detected in a reading area for reading a vein image of the living body, and a part of the second electrode selected by the first drive circuit based on a detection result; and the second electrode The vein image capturing apparatus according to claim 8, further comprising a control circuit that determines a part of the first electrodes selected by the drive circuit. A first drive circuit that selects one or more of the second electrodes as a target for supplying a drive signal for causing the light emitting layer to emit light among the plurality of second electrodes;
A readout circuit that reads a light receiving signal indicating the amount of the reflected light incident on the light receiving surface from each of the plurality of light receiving elements;
A generation circuit for generating an image of the vein based on the received light signal read by the read circuit;
The plurality of second electrodes are divided into a plurality of groups,
The first driving circuit sequentially selects the plurality of second electrodes in the group unit,
The readout circuit reads out the received light signals from all the light receiving elements each time the first drive circuit performs selection in units of groups,
Each time the first driving circuit performs selection in units of groups, the generation circuit has at least the first when viewed from the cover glass side from all the light reception signals read by the reading circuit. The vein image is generated based on the remaining light reception signals except for the light reception signals read from the light receiving elements adjacent to the one or more second electrodes selected by the drive circuit. 4. The vein imaging apparatus according to 4 . A first drive circuit that selects one or more of the second electrodes as a target for supplying a drive signal for causing the light emitting layer to emit light among the plurality of second electrodes;
A readout circuit that reads a light receiving signal indicating the amount of the reflected light incident on the light receiving surface from each of the plurality of light receiving elements;
A generation circuit for generating an image of the vein based on the received light signal read by the read circuit;
The plurality of second electrodes are divided into a plurality of groups,
The first driving circuit sequentially selects the plurality of second electrodes in the group unit,
The readout circuit has at least one or more second electrodes selected by the first drive circuit when viewed from the cover glass side each time the first drive circuit performs selection in units of groups. 5. The vein image pickup apparatus according to claim 4, wherein the light receiving signal is read from the remaining light receiving elements except for the light receiving elements adjacent to each other. A first drive circuit that selects one or more of the second electrodes as a target for supplying a drive signal for causing the light emitting layer to emit light among the plurality of second electrodes;
A second drive circuit that selects one or more of the first electrodes as a target for supplying the drive signal among the plurality of first electrodes;
A readout circuit that reads a light receiving signal indicating the amount of the reflected light incident on the light receiving surface from each of the plurality of light receiving elements;
A generation circuit for generating an image of the vein based on the received light signal read by the read circuit;
The plurality of first electrodes and the plurality of second electrodes are divided into a plurality of groups,
The first driving circuit sequentially selects the plurality of second electrodes in the group unit,
The second driving circuit sequentially selects the plurality of first electrodes in units of groups,
The reading circuit reads the light reception signal from all the light receiving elements each time the first driving circuit and the second driving circuit perform selection in units of groups,
The generation circuit is viewed in plan from the cover glass side from all the received light signals read by the readout circuit each time the first driving circuit and the second driving circuit perform selection in units of groups. In this case, at least from the light receiving element closest to the portion where the one or more second electrodes selected by the first driving circuit and the one or more first electrodes selected by the second driving circuit overlap. The vein image capturing apparatus according to claim 5, wherein an image of the vein is generated based on the remaining received light signal except for the read received light signal. A first drive circuit that selects one or more of the second electrodes as a target for supplying a drive signal for causing the light emitting layer to emit light among the plurality of second electrodes;
A second drive circuit that selects one or more of the first electrodes as a target for supplying the drive signal among the plurality of first electrodes;
A readout circuit that reads a light receiving signal indicating the amount of the reflected light incident on the light receiving surface from each of the plurality of light receiving elements;
A generation circuit for generating an image of the vein based on the received light signal read by the read circuit;
The plurality of first electrodes and the plurality of second electrodes are divided into a plurality of groups,
The first driving circuit sequentially selects the plurality of second electrodes in the group unit,
The second driving circuit sequentially selects the plurality of first electrodes in units of groups,
The reading circuit is selected by at least the first driving circuit when viewed in plan from the cover glass side each time the first driving circuit and the second driving circuit select in units of groups. The received light signal is read from the remaining light receiving elements except for the light receiving element closest to the portion where the one or more second electrodes and the one or more first electrodes selected by the second drive circuit overlap. The vein image capturing apparatus according to claim 5. An electronic apparatus comprising the vein image capturing apparatus according to any one of claims 1 to 1 3.

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