Detection device

Abstract

This detection device comprises: a first optical sensor and a second optical sensor that are disposed so as to face each other, each of the first optical sensor and the second optical sensor including a substrate, and a plurality of light detection elements and a plurality of light sources that are disposed in a planar manner on the substrate; and a light-shielding layer provided to the reverse surface of the substrate of each of the first optical sensor and the second optical sensor. The substrates of the first optical sensor and the second optical sensor are both flexible substrates, at least one end of each of the substrates being connected to each other. Each of the first optical sensor and the second optical sensor includes a plurality of sensor pixels arranged in a matrix, and each of the plurality of sensor pixels includes a light detection element and a light source.

Description

Detection device

[0001] The present invention relates to a detection device.

[0002] Optical sensors capable of detecting fingerprint patterns and vein patterns are known (see, for example, Patent Document 1). Such optical sensors are incorporated into the housings of wearable devices such as smartwatches, wristwatches, and wristbands to acquire biometric information such as pulse waves. The optical sensor includes a sensor substrate, multiple photodiodes mounted on the sensor substrate, and a light source that irradiates the multiple photodiodes with light.

[0003] Japanese Patent Application Laid-Open No. 2009-32005

[0004] In a detection device using such an optical sensor, the sensor output from the multiple photodiodes may vary depending on the distance between the multiple photodiodes and the light source, the state of the object to be detected such as a finger, etc. This may result in a decrease in the accuracy of detecting the object to be detected.

[0005] An object of the present invention is to provide a detection device that can improve detection accuracy.

[0006] A detection device according to one aspect of the present disclosure includes a substrate, a plurality of light detection elements and a plurality of light sources arranged in a planar manner on the substrate, a first light sensor and a second light sensor arranged opposite each other, and a light-shielding layer provided on the back surface of the substrate of each of the first light sensor and the second light sensor, wherein the substrates of the first light sensor and the second light sensor are each flexible substrates and are connected at least at one end to each other, and each of the first light sensor and the second light sensor includes a plurality of sensor pixels arranged in a matrix, and each of the plurality of sensor pixels includes the light detection element and the light source.

[0007] FIG. 1 is a schematic diagram showing an example of the appearance of a detection device according to the first embodiment with a finger placed inside. FIG. 2 is a cross-sectional view taken along line II-II' of FIG. 1. FIG. 3 is an enlarged cross-sectional view showing a portion of the detection device (region A shown in FIG. 2). FIG. 4 is a development view showing an example of development of substrates of a first optical sensor and a second optical sensor of the detection device according to the first embodiment. FIG. 5 is a plan view showing an example of the configuration of a scanning circuit, external connection terminals, and wiring of the detection device according to the first embodiment. FIG. 6 is a block diagram showing an example of the configuration of a control circuit. FIG. 7 is a circuit diagram showing sensor pixels of the detection device according to the first embodiment. FIG. 8 is a timing chart showing an example of the operation of the detection device according to the first embodiment. FIG. 9 is a flowchart showing an example of the operation of the detection device according to the first embodiment. FIG. 10 is a flowchart showing an example of a method for generating sensor correction data. FIG. 11 is an explanatory diagram for explaining step ST11 in FIG. 10. FIG. 12 is an explanatory diagram for explaining the method for generating sensor correction data in FIG. 10. FIG. 13 is a plan view schematically showing multiple sensor pixels of a detection device according to a first modified example. FIG. 14 is a circuit diagram showing a sensor pixel of a detection device according to a second modified example. FIG. 15 is a development view showing an example of development of substrates of a first optical sensor and a second optical sensor of a detection device according to the second embodiment. FIG. 16 is a plan view showing an example of the configuration of a scanning circuit, external connection terminals, and wiring of a detection device according to the second embodiment. FIG. 17 is a schematic diagram showing an example of the appearance of a detection device according to a third embodiment with a finger placed inside. FIG. 18 is a plan view showing an example of the configuration of a scanning circuit, external connection terminals, and wiring of a detection device according to the third embodiment. FIG. 19 is an explanatory diagram for explaining an example of a detection method in a transmission mode of a detection device according to the third embodiment. FIG. 20 is a timing chart showing an example of operation of a detection device according to the third embodiment in a transmission mode. FIG. 21 is a diagram showing an example of a pulse waveform acquired at each sensor pixel. FIG. 22 is a diagram showing an example of a pulse waveform acquired at each sensor pixel. FIG. 23 is a diagram showing an example of a pulse waveform acquired at each sensor pixel. FIG. 24 is an explanatory diagram for explaining an example of a detection method in a reflection mode of a detection device according to the third embodiment. FIG. 25 is a timing chart showing an example of the operation of the detection device according to the third embodiment in the reflection mode.

[0008] Modes (embodiments) for carrying out the present disclosure will be described in detail with reference to the drawings. The present disclosure is not limited to the contents described in the following embodiments. Furthermore, the components described below include those that can be easily imagined by a person skilled in the art and those that are substantially identical. Furthermore, the components described below can be combined as appropriate. Note that the disclosure is merely an example, and any appropriate modifications that a person skilled in the art can easily conceive while maintaining the gist of the present disclosure are naturally included within the scope of the present disclosure. Furthermore, for clarity of explanation, the drawings may schematically depict the width, thickness, shape, etc. of each part compared to the actual embodiment. However, these are merely examples and are not intended to limit the interpretation of the present disclosure. Furthermore, in this disclosure and each figure, elements similar to those described above with reference to the previous figures may be designated by the same reference numerals, and detailed descriptions may be omitted as appropriate.

[0009] In the present disclosure, when expressing an aspect of placing another structure on top of a certain structure, the term "on top" is used, unless otherwise specified, to include both a case in which another structure is placed directly on top of a certain structure so as to be in contact with the certain structure, and a case in which another structure is placed above a certain structure via yet another structure.

[0010] (First embodiment) Fig. 1 is a schematic diagram showing an example of the appearance of a detection device according to a first embodiment in a state where a finger is placed inside. Fig. 2 is a cross-sectional view taken along line II-II' in Fig. 1. Fig. 3 is a cross-sectional view showing an enlarged portion of the detection device (area A shown in Fig. 2).

[0011] As shown in Fig. 1, the detection device 1 according to the first embodiment is a bag-like device that has an opening OP on one side and can be attached to and detached from the human body. The detection device 1 is attached to, for example, a finger Fg of the human body. The finger Fg includes the thumb, index finger, middle finger, ring finger, little finger, etc. The detection device 1 can detect biological information about a living body from the finger Fg on which it is attached. The finger Fg is an example of a measurement target.

[0012] The detection device 1 has a first optical sensor 10 and a second optical sensor 20 facing the first optical sensor 10. The detection device 1 has a substantially rectangular shape and has a first side S1, a second side S2 opposite the first side S1, and a third side S3 and a fourth side S4 between the first side S1 and the second side S2. An opening OP is formed in the first optical sensor 10 and the second optical sensor 20 along the first side S1. Furthermore, the first optical sensor 10 and the second optical sensor 20 are bonded together at their edges along the second side S2, the third side S3, and the fourth side S4.

[0013] 2 and 3 , the first optical sensor 10 includes a substrate 11, a plurality of photodetection elements 12 and a plurality of light sources 13 arranged in a planar manner on the substrate 11, and a sealing film 18. The second optical sensor 20 includes the substrate 11, a plurality of photodetection elements 22 and a plurality of light sources 23 arranged in a planar manner on the substrate 11, and a sealing film 28. The first optical sensor 10 and the second optical sensor 20 of this embodiment are each a planar optical sensor.

[0014] The detection device 1 also has a light-shielding layer 35 provided on the back surface of the substrate 11 of the first optical sensor 10, and a light-shielding layer 36 provided on the back surface of the substrate 11 of the second optical sensor 20. The back surface of the substrate 11 is the surface of the substrate 11 opposite to the surface on which the multiple light detection elements 12, 22 and the multiple light sources 13, 23 are provided. Alternatively, the back surface of the substrate 11 is the surface located on the outside when the substrates 11 are attached together in a bag shape.

[0015] As shown in FIG. 2 , the substrate 11 is a common substrate for the first optical sensor 10 and the second optical sensor 20, and is an integrated flexible substrate. The substrate 11 is formed of a sheet-like resin material. The substrate 11 has a first region 11a, a second region 11b, and a folding region 11c. The first region 11a corresponds to the first optical sensor 10, and the second region 11b corresponds to the second optical sensor 20. The folding region 11c is located between the first region 11a and the second region 11b. The substrate 11 is folded at the folding region 11c so that the first region 11a and the second region 11b face each other, and are bonded together in a bag shape having an opening OP along the first side S1. Furthermore, the substrate 11 (first region 11a and second region 11b) is configured to be deformable according to the shape of a detection object such as a finger Fg.

[0016] 3, a plurality of photodetector elements 12 and a plurality of light sources 13 are provided on the surface of the first region 11a facing the second region 11b. A light-shielding layer 35 is provided on the surface of the first region 11a opposite to the second region 11b. A plurality of photodetector elements 22 and a plurality of light sources 23 are provided on the surface of the second region 11b facing the first region 11a. A light-shielding layer 36 is provided on the surface of the second region 11b opposite to the first region 11a.

[0017] The photodetector elements 12 and 22 output electrical signals corresponding to the light irradiated thereon. More specifically, the photodetector elements 12 and 22 are photodiodes, and are configured, for example, as PIN (Positive Intrinsic Negative) photodiodes or OPDs (Organic Photodiodes) using organic semiconductors.

[0018] The multiple light sources 13 of the first optical sensor 10 are arranged opposite the multiple light detection elements 22 of the second optical sensor 20. The multiple light sources 23 of the second optical sensor 20 are arranged opposite the multiple light detection elements 12 of the first optical sensor 10. The light sources 13, 23 and the light detection elements 12, 22 may face each other or cross each other. The multiple light sources 13, 23 may be, for example, inorganic light-emitting diodes (LEDs) or organic light-emitting diodes (OLEDs). The multiple light sources 13, 23 irradiate light of a predetermined wavelength. In this embodiment, the multiple light sources 13, 23 have multiple first light-emitting elements 14IR, 24IR, multiple second light-emitting elements 14R, 24R, and multiple third light-emitting elements 14G, 24G (see Figure 4) so ​​as to be able to emit near-infrared light, red light, and green light.

[0019] The sealing film 18 of the first optical sensor 10 is provided on the first region 11a of the substrate 11, covering the multiple light detection elements 12 and the multiple light sources 13. The sealing film 28 of the second optical sensor 20 is provided on the second region 11b of the substrate 11, covering the multiple light detection elements 22 and the multiple light sources 23. The sealing film 18 of the first optical sensor 10 and the sealing film 28 of the second optical sensor 20 are made of an inorganic film such as a silicon nitride film or an aluminum oxide film, or a resin film such as an acrylic film. The sealing film 18 and the sealing film 28 are not limited to a single layer, and may be a laminated film of two or more layers combining the inorganic film and the resin film.

[0020] The first optical sensor 10 (plurality of photodetection elements 12 and plural light sources 13) and the second optical sensor 20 (plurality of photodetection elements 22 and plural light sources 23) are provided between the light-shielding layer 35 and the light-shielding layer 36. The light-shielding layer 35 and the light-shielding layer 36 can prevent light from the light source from leaking to the outside. Alternatively, the light-shielding layer 35 and the light-shielding layer 36 can prevent unnecessary light from the outside from entering the photodetection elements.

[0021] In the detection device 1 of this embodiment, the first optical sensor 10 and the second optical sensor 20 each have a light detection element 12, 22 and a light source 13, 23. Therefore, the first optical sensor 10 and the second optical sensor 20 can be operated according to the type of object to be detected, such as a finger Fg, and the biological information to be detected. The detection device 1 has, for example, detection in a transmission mode and detection in a reflection mode.

[0022] In the transmission mode, the multiple light sources 13, 23 of one of the first optical sensor 10 and the second optical sensor 20 are turned on, and the multiple light detection elements 12, 22 of the other of the first optical sensor 10 and the second optical sensor 20 output detection signals corresponding to the irradiated light. Specifically, light emitted from the multiple light sources 23 of the second optical sensor 20 passes through a detection target such as a finger Fg and is incident on the multiple light detection elements 12 of the first optical sensor 10. This allows the detection device 1 to detect information about a living body inside a finger Fg or the like. The information about the living body includes, for example, the pulse wave, pulse rate, and blood vessel image of the finger or palm. That is, in the transmission mode, the detection device 1 may be configured as a vein detection device that detects vascular patterns such as veins.

[0023] In the reflective mode, one of the light sources 13, 23 of the first optical sensor 10 and the second optical sensor 20 is turned on, and one of the plurality of light detection elements 12, 22 of the first optical sensor 10 and the second optical sensor 20 outputs a detection signal according to the irradiated light. In addition, the other of the plurality of light sources 13, 23 of the first optical sensor 10 and the second optical sensor 20 is turned off, and the other of the plurality of light detection elements 12, 22 of the first optical sensor 10 and the second optical sensor 20 stops detection.

[0024] Specifically, light emitted from the multiple light sources 13 of the first optical sensor 10 is reflected by the surface of the object to be detected, such as a finger Fg, and enters the multiple light detection elements 12 of the first optical sensor 10. At this time, the multiple light sources 23 of the second optical sensor 20 are turned off, and the multiple light detection elements 22 of the second optical sensor 20 stop detection. This allows the first optical sensor 10 to detect the shape of the projections and recesses on the surface of the finger or the like, thereby detecting a fingerprint. That is, in the reflective mode, the detection device 1 may be configured as a fingerprint detection device that detects fingerprints.

[0025] 4 is a development view showing an example of the substrates of the first optical sensor and the second optical sensor of the detection device according to the first embodiment. Fig. 4 is a development view of the substrate 11 developed into a flat plate around a virtual central axis along the third side S3. In Fig. 4, the first sides S1a and S1b, the second sides S2a and S2b, the third sides S3a and S3b, and the fourth sides S4a and S4b of the substrate 11 correspond to the first side S1, the second side S2, the third side S3, and the fourth side S4 of the detection device 1 (see Fig. 1), respectively.

[0026] In the following description, the first direction Dx is a direction in a plane parallel to the substrate 11 when the substrate 11 is unfolded. The second direction Dy is a direction in a plane parallel to the substrate 11, and is a direction perpendicular to the first direction Dx. The second direction Dy may intersect the first direction Dx without being perpendicular to it. The third direction Dz is a direction perpendicular to the first direction Dx and the second direction Dy. The third direction Dz is the normal direction of the substrate 11. Furthermore, "planar view" refers to the positional relationship when viewed from a direction perpendicular to the substrate 11.

[0027] The first side S1a of the first region 11a and the first side S1b of the second region 11b are arranged along the same side of the substrate 11. The second side S2a of the first region 11a and the second side S2b of the second region 11b are located on the opposite side of the first sides S1a and S1b and are arranged along the same side of the substrate 11. The third side S3a of the first region 11a and the third side S3b of the second region 11b are imaginary sides located at the boundary between the first region 11a and the folding region 11c and the boundary between the second region 11b and the folding region 11c. The fourth side S4a of the first region 11a and the fourth side S4b of the second region 11b are located between the first sides S1a and S1b and the second sides S2a and S2b.

[0028] The adhesive layer 19 is provided in regions along the second side S2a, third side S3a, and fourth side S4a of the first region 11a. The adhesive layer 19 is not provided in a region along the first side S1a of the first region 11a. Similarly, the adhesive layer 29 is provided in regions along the second side S2b, third side S3b, and fourth side S4b of the second region 11b. The adhesive layer 29 is not provided in a region along the first side S1b of the second region 11b.

[0029] The substrate 11 is folded at the folding region 11c, and the adhesive layer 19 in the first region 11a and the adhesive layer 29 in the second region 11b are bonded together. That is, in the substrate 11, the region along the second side S2a, the third side S3a, and the fourth side S4a in the first region 11a and the region along the second side S2b, the third side S3b, and the fourth side S4b in the second region 11b are bonded together. That is, the substrates 11 of the first optical sensor 10 and the second optical sensor 20 are each flexible substrates, and at least one end (e.g., the region along the fourth side S4a and the fourth side S4b) is connected to each other. An opening OP is formed along the first side S1a of the first region 11a and the first side S1b of the second region 11b. Furthermore, the plurality of photodetector elements 12 and the plurality of light sources 13 in the first region 11a are arranged to face the plurality of photodetector elements 22 and the plurality of light sources 23 in the second region 11b.

[0030] 4, each of the first optical sensor 10 and the second optical sensor 20 includes a plurality of sensor pixels PX arranged in a matrix. That is, the plurality of sensor pixels PX are arranged side by side in the first direction Dx and the second direction Dy on the substrate 11. Each of the plurality of sensor pixels PX includes a photodetection element 12, 22 and a light source 13, 23 (light-emitting element 14, 24).

[0031] More specifically, the sensor pixel PX of the first optical sensor 10 includes one photodetector element 12 and three light-emitting elements: a first light-emitting element 14IR, a second light-emitting element 14R, and a third light-emitting element 14G. The sensor pixel PX of the second optical sensor 20 includes one photodetector element 22 and three light-emitting elements: a first light-emitting element 24IR, a second light-emitting element 24R, and a third light-emitting element 24G. The first light-emitting elements 14IR and 24IR emit near-infrared light. The second light-emitting elements 14R and 24R emit red light. The third light-emitting elements 14G and 24G emit green light. Note that in FIG. 4, the first light-emitting elements 14IR and 24IR, the second light-emitting elements 14R and 24R, and the third light-emitting elements 14G and 24G are shown with different hatching to make the drawing easier to understand.

[0032] In the following description, when it is not necessary to distinguish between the first light-emitting element 14IR, the second light-emitting element 14R, and the third light-emitting element 14G, they will be simply referred to as light-emitting element 14. Furthermore, when it is not necessary to distinguish between the first light-emitting element 24IR, the second light-emitting element 24R, and the third light-emitting element 24G, they will be simply referred to as light-emitting element 24.

[0033] In the multiple sensor pixels PX of the first optical sensor 10, the first light-emitting element 14IR, the second light-emitting element 14R, the third light-emitting element 14G, and the photodetection element 12 are arranged in a grid pattern. The photodetection element 12 is adjacent to the second light-emitting element 14R in the first direction Dx. The first light-emitting element 14IR is adjacent to the third light-emitting element 14G in the first direction Dx. The photodetection element 12 is adjacent to the third light-emitting element 14G in the second direction Dy. The second light-emitting element 14R is adjacent to the first light-emitting element 14IR in the second direction Dy.

[0034] Furthermore, in each of the plurality of sensor pixels PX of the second optical sensor 20, the first light-emitting element 24IR, the second light-emitting element 24R, the third light-emitting element 24G, and the photodetection element 22 are arranged in a grid pattern. The arrangement pattern of the photodetection element 22 and the three light-emitting elements, the first light-emitting element 24IR, the second light-emitting element 24R, and the third light-emitting element 24G, in the sensor pixel PX of the second optical sensor 20 is the same as that of the first optical sensor 10, and therefore a repeated description will be omitted.

[0035] 4 , in the sensor pixel PX, three light-emitting elements 24IR, 24R, and 24G are provided adjacent to one photodetection element 12. As a result, for example, in the transmissive mode, the light from the light-emitting elements 24IR, 24R, and 24G of the second photodetector 20 is uniformly irradiated onto the multiple photodetection elements 12 of the first photodetector 10. Alternatively, in the reflective mode, the light from the light-emitting elements 14IR, 14R, and 14G of the first photodetector 10 is uniformly irradiated onto the multiple photodetection elements 12 of the first photodetector 10. In other words, the arrangement relationship between the multiple photodetection elements 12, 22 and the multiple light-emitting elements 14IR, 14R, 14G, 24IR, 24R, and 24G can prevent light of a predetermined wavelength from each light-emitting element 14, 24 from being unevenly irradiated onto a specific photodetection element 12, 22.

[0036] Note that the number, arrangement pitch, etc. of the multiple sensor pixels PX (the multiple photodetection elements 12, 22 and the multiple light-emitting elements 14, 24) shown in FIG. 4 are merely examples and are not limited to these. In each of the first optical sensor 10 and the second optical sensor 20, the multiple sensor pixels PX are arranged in four rows and four columns. However, this is not limited to this arrangement and the multiple sensor pixels PX may be arranged in three rows and three columns or less, or five rows and five columns or more. Furthermore, the number of the multiple sensor pixels PX arranged along the first direction Dx may be different from the number of the multiple sensor pixels PX arranged along the second direction Dy. Furthermore, the arrangement pattern of the multiple photodetection elements 12, 22 and the multiple light-emitting elements 14, 24 is not limited to a grid pattern and may be other arrangement patterns. For example, the multiple photodetection elements 12, 22 and the multiple light-emitting elements 14, 24 may be arranged in a triangular grid pattern or a houndstooth grid pattern in which the positions of the multiple photodetection elements 12, 22 and the multiple light-emitting elements 14, 24 are shifted in the first direction Dx or the second direction Dy.

[0037] Fig. 5 is a plan view showing an example of the configuration of the scanning circuit, external connection terminals, and wiring of the detection device according to the first embodiment. Fig. 6 is a block diagram showing an example of the configuration of the control circuit. As shown in Fig. 5, the detection device 1 further includes sensor scanning circuits 16, 26, light source scanning circuits 17, 27, a first external connection terminal T1, wirings L1, L2, L3, L4, L5, L6, L7, and L8, a wiring substrate 30, and a control circuit 50.

[0038] The first external connection terminal T1 is provided in a region along the fourth side S4a in the first region 11a of the substrate 11. The first external connection terminal T1 is provided only in the first optical sensor 10, and is not provided in the second optical sensor 20. The external wiring substrate 30 is connected to the first external connection terminal T1.

[0039] The first optical sensor 10 has a sensor scanning circuit 16 and a light source scanning circuit 17. The second optical sensor 20 has a sensor scanning circuit 26 and a light source scanning circuit 27. In the first optical sensor 10, the sensor scanning circuit 16 is provided in an area along a second side S2a that intersects with a fourth side S4a of the substrate 11. The light source scanning circuit 17 is provided in an area along a first side S1a that intersects with the fourth side S4a of the substrate 11. In other words, the sensor scanning circuit 16 and the light source scanning circuit 17 are provided in an area along a side of the substrate 11 that is different from the side on which the first external connection terminals T1 are provided. Furthermore, in the second direction Dy, the plurality of sensor pixels PX (photodetection elements 12 and light sources 13) are arranged between the sensor scanning circuit 16 and the light source scanning circuit 17.

[0040] The sensor scanning circuit 16 is electrically connected to the wiring substrate 30 through wiring L1 and the first external connection terminal T1. The light source scanning circuit 17 is electrically connected to the wiring substrate 30 through wiring L2 and the first external connection terminal T1. Furthermore, the plurality of sensor pixels PX (light detection elements 12 and light sources 13) of the first optical sensor 10 are electrically connected to the wiring substrate 30 through wiring L3 and the first external connection terminal T1.

[0041] In the second optical sensor 20, the sensor scanning circuit 26 is provided in an area along the second side S2b that intersects with the fourth side S4a of the substrate 11. The light source scanning circuit 27 is provided in an area along the first side S1b that intersects with the fourth side S4a of the substrate 11. That is, the sensor scanning circuit 26 and the light source scanning circuit 27 are provided in an area along a side of the substrate 11 that is different from the side on which the first external connection terminals T1 are provided. Furthermore, the multiple sensor pixels PX (photodetection elements 22 and light sources 23) are arranged between the sensor scanning circuit 26 and the light source scanning circuit 27 in the second direction Dy.

[0042] The sensor scanning circuit 16 of the first optical sensor 10 and the sensor scanning circuit 26 of the second optical sensor 20 are arranged adjacent to each other along the same side (second sides S2a and S2b) of the substrate 11. The light source scanning circuit 17 of the first optical sensor 10 and the light source scanning circuit 27 of the second optical sensor 20 are arranged adjacent to each other along the same side (first sides S1a and S1b) of the substrate 11.

[0043] In the second optical sensor 20, the sensor scanning circuit 26 is electrically connected to the first external connection terminal T1 through a wiring L4. The wiring L4 passes between the sensor scanning circuit 16 in the first region 11a and the second side S2a and is connected to the first external connection terminal T1. The light source scanning circuit 27 is electrically connected to the first external connection terminal T1 through a wiring L5. The wiring L5 passes between the light source scanning circuit 17 in the first region 11a and the first side S1a and is connected to the first external connection terminal T1.

[0044] The plurality of sensor pixels PX (photodetection elements 22 and light sources 23) arranged in the second optical sensor 20 that is not provided with the first external connection terminal T1 are electrically connected to the first external connection terminal T1 through wiring L8 provided in the first optical sensor 10 and the second optical sensor 20. The wiring L8 is formed in an inner layer of the substrate 11, and is connected to the first external connection terminal T1 through an area that overlaps with the plurality of sensor pixels PX of the first optical sensor 10.

[0045] A power supply voltage is supplied via wirings L7 and L8 to the sensor pixels PX arranged in the first optical sensor 10 and the second optical sensor 20. The power supply voltage includes a reference potential COM of the light detection element, a sensor power supply signal VDDSNS (see FIG. 7), and an anode potential Vad and a cathode potential Vcd of the light source (see FIG. 7).

[0046] The wiring L6 passes between the sensor scanning circuit 16 and the plurality of sensor pixels PX in the first region 11a and is connected to the first external connection terminal T1. The wiring L7 passes between the light source scanning circuit 17 and the plurality of sensor pixels PX in the first region 11a and is connected to the first external connection terminal T1.

[0047] A plurality of sensor scanning lines GL are connected to each of the sensor scanning circuits 16, 26. The plurality of sensor scanning lines GL extend in the second direction Dy and are connected to a plurality of photodetection elements 12 or photodetection elements 22 arranged in the second direction Dy. More specifically, the plurality of sensor scanning lines GL are connected to the gates of the drive transistors Tr (see FIG. 7 ) corresponding to the plurality of photodetection elements 12 or photodetection elements 22, respectively.

[0048] A plurality of light source scanning lines GUL are connected to each of the light source scanning circuits 17, 27. The plurality of light source scanning lines GUL extend in the second direction Dy and are connected to the plurality of light sources 13 or light sources 23 arranged in the second direction Dy. Specifically, the plurality of light source scanning lines GUL are connected to the gates of the light source control transistors TrU (see FIG. 7 ) corresponding to each of the light emitting elements 14, 24 of the plurality of light sources 13 or light sources 23.

[0049] In this embodiment, the first external connection terminal T1 is provided only on the first optical sensor 10, and the first optical sensor 10 and the second optical sensor 20 do not have the third external connection terminal 15 and the second external connection terminal 25 (see FIG. 16 ). Therefore, in this embodiment, the process of bonding the first region 11 a and the second region 11 b of the substrate 11 can be simplified.

[0050] Note that the first external connection terminal T1 is provided in the first region 11a of the substrate 11, but is not limited to this. The first external connection terminal T1 may also be provided in the second region 11b of the substrate 11. That is, the first external connection terminal T1 may be provided only in the second optical sensor 20 out of the first optical sensor 10 and the second optical sensor 20. In this case, the multiple sensor pixels PX arranged in the first optical sensor 10 that is not provided with the first external connection terminal T1 are electrically connected to the first external connection terminal T1 through wiring provided in the first optical sensor 10 and the second optical sensor 20.

[0051] The control circuit 50 supplies various control signals to the first optical sensor 10 and the second optical sensor 20 through the wiring board 30, controls the detection of the multiple light detection elements 12, 22, and also controls the lighting of the multiple light-emitting elements (first light-emitting elements 14IR, 24IR, second light-emitting elements 14R, 24R, third light-emitting elements 14G, 24G) possessed by the multiple light sources 13, 23.

[0052] As shown in FIG. 6, the control circuit 50 includes a detection circuit 48, a sensor control circuit 51, a light source control circuit 52, a correction data generation circuit 53, and a memory circuit .

[0053] The detection circuit 48 is, for example, an analog front end (AFE) circuit. The detection circuit 48 is electrically connected to the photodetection elements 12 of the first optical sensor 10 and the photodetection elements 22 of the second optical sensor 20, and receives detection signals from the photodetection elements 12 and 22 and performs predetermined signal processing. Details of the detection circuit 48 will be described later with reference to FIG. 7.

[0054] The sensor control circuit 51 outputs various control signals to the sensor scanning circuits 16 and 26 to control detection by the photodetection elements 12 and 22. The sensor control circuit 51 also supplies various power supply voltages such as a reference potential COM and a sensor power supply signal VDDSNS to the photodetection elements 12 and 22.

[0055] The light source control circuit 52 outputs various control signals to the light source scanning circuits 17 and 27 to control the lighting of the light emitting elements 14 and 24 of the light sources 13 and 23. The light source control circuit 52 also supplies various power supply voltages such as an anode potential Vad and a cathode potential Vcd to the plurality of light emitting elements 14 and 24.

[0056] The correction data generation circuit 53 generates correction data for calibrating the photodetection elements 12 and 22. That is, the correction data generation circuit 53 generates correction data so that the photodetection elements 12 and 22 have a constant sensor output when light is emitted from the light-emitting elements 14 and 24 of the light sources 13 and 23. The generation of correction data will be described later with reference to FIGS.

[0057] The memory circuit 54 stores various information such as the sensor outputs of the photodetection elements 12 and 22 output from the detection circuit 48, correction data, and the like.

[0058] The control circuit 50 shown in Fig. 6 is merely an example and can be modified as appropriate. For example, the various circuits shown in Fig. 6 may be provided as separate circuits. The control circuit 50 may include other circuits necessary to realize detection by the light detection elements 12 and 22 and lighting of the light sources 13 and 23.

[0059] Next, an example of the circuit configuration of the sensor pixel PX will be described. FIG. 7 is a circuit diagram showing the sensor pixel of the detection device according to the first embodiment. Note that FIG. 7 also shows the circuit configuration of the detection circuit 48. Although FIG. 7 describes the sensor pixel PX of the first optical sensor 10, the sensor pixel PX of the second optical sensor 20 also has a similar circuit configuration. The description of the sensor pixel PX of the first optical sensor 10 can also be applied to the sensor pixel PX of the second optical sensor 20.

[0060] 7, the sensor pixel PX includes, as a sensor drive circuit, a photodetection element 12, a capacitance element Ca, and a drive transistor Tr. The sensor pixel PX also includes, as a light source drive circuit, a first light emitting element 14IR, a second light emitting element 14R, a third light emitting element 14G, a light source drive transistor TrD, a light source control transistor TrU, and a storage capacitor Cc.

[0061] The sensor driving circuit of the sensor pixel PX will be described. The first optical sensor 10 has a plurality of sensor scanning lines GL provided on the substrate 11 and a plurality of sensor signal lines SL intersecting the plurality of sensor scanning lines GL. Of the plurality of sensor scanning lines GL, two sensor scanning lines GL(m-1) and GL(m) arranged in the second direction Dy are shown in FIG. 7 . Also, one sensor signal line SL(n) is shown among the plurality of sensor signal lines SL.

[0062] The drive transistor Tr is provided corresponding to the light detection element 12. The drive transistor Tr is configured by a thin film transistor, and in this example, is configured by an n-channel MOS (Metal Oxide Semiconductor) type TFT (Thin Film Transistor).

[0063] Each of the plurality of sensor scanning lines GL is connected to the gates of each of the plurality of drive transistors Tr arranged along the sensor scanning line GL. Each of the plurality of sensor signal lines SL is connected to one of the source and drain of each of the plurality of drive transistors Tr arranged along the sensor signal line SL. The other of the source and drain of each of the plurality of drive transistors Tr is connected to the cathode of the light detection element 12 and the capacitance element Ca.

[0064] A sensor power supply signal VDDSNS is supplied to the anode of the light detection element 12 from the control circuit 50. Furthermore, a reference potential COM, which serves as the initial potential of the sensor signal line SL and the capacitance element Ca, is supplied to the sensor signal line SL and the capacitance element Ca from the control circuit 50 via the reset transistor TrR.

[0065] When light is irradiated onto the sensor pixel PX, a current corresponding to the amount of light flows through the photodetection element 12, causing charge to accumulate in the capacitance element Ca. When the drive transistor Tr is turned on, a current corresponding to the charge accumulated in the capacitance element Ca flows through the sensor signal line SL. The sensor signal line SL is connected to the detection circuit 48 via the connection transistor TrS. This allows the detection device 1 to detect a signal corresponding to the amount of light irradiated onto the photodetection element 12 for each sensor pixel PX.

[0066] During the readout period, the switch SSW of the detection circuit 48 is turned on, and the detection circuit 48 is connected to the sensor signal line SL. The detection signal amplifier circuit 42 of the detection circuit 48 converts the current or charge supplied from the sensor signal line SL into a voltage corresponding to the current or charge. A reference potential (Vref) having a fixed potential is input to the non-inverting input terminal (+) of the detection signal amplifier circuit 42, and the sensor signal line SL is connected to the inverting input terminal (-). In the first embodiment, a signal equal to the sensor reference potential COM is input as the reference potential (Vref). The A / D conversion circuit 43 converts the analog signal output from the detection signal amplifier circuit 42 into a digital signal and outputs it as sensor output data. The detection signal amplifier circuit 42 also has a capacitance element Cb and a reset switch RSW. During the reset period, the reset switch RSW is turned on, and the charge of the capacitance element Cb is reset.

[0067] Next, the light source driving circuit of the sensor pixel PX will be described. The first optical sensor 10 further includes a plurality of light source scanning lines GUL provided on the substrate 11, and a plurality of light source signal lines SUL intersecting the plurality of light source scanning lines GUL. The light source scanning lines GUL_IR(m), GUL_R(m), and GUL_G(m) are provided corresponding to the first light-emitting element 14IR, the second light-emitting element 14R, and the third light-emitting element 14G, respectively. The light source scanning lines GUL_IR(m), GUL_R(m), and GUL_G(m) are arranged alongside the sensor scanning line GL(m) and extend in the extension direction of the sensor scanning line GL(m).

[0068] The light source signal lines SULa(n) are provided corresponding to the first light-emitting element 14IR and the second light-emitting element 14R. That is, one light source signal line SULa(n) is provided in common to the first light-emitting element 14IR and the second light-emitting element 14R. Furthermore, the light source signal line SULb(n) is provided corresponding to the third light-emitting element 14G. The light source signal lines SULa(n) and SULb(n) are arranged alongside the sensor signal line SL(n) and extend in the extension direction of the sensor signal line SL(n).

[0069] The light source driving transistor TrD and the light source control transistor TrU are formed of thin film transistors, each of which is an n-type TFT. The light source driving transistor TrD and the light source control transistor TrU are provided in each of the first light emitting element 14IR, the second light emitting element 14R, and the third light emitting element 14G.

[0070] In the following description, the light source drive circuit of the first light emitting element 14IR among the plurality of light emitting elements 14 included in the sensor pixel PX will be described. However, the description of the light source drive circuit of the first light emitting element 14IR can also be applied to the light source drive circuits of the second light emitting element 14R and the third light emitting element 14G.

[0071] The gate of the light-source driving transistor TrD is connected to the output side of the light-source control transistor TrU. The source of the light-source driving transistor TrD is supplied with an anode potential Vad. The drain of the light-source driving transistor TrD is connected to the anode of the first light-emitting element 14IR. The cathode of the first light-emitting element 14IR is supplied with a cathode potential Vcd.

[0072] The gate of the light source control transistor TrU is connected to the light source scanning line GUL_IR(m). One of the source and drain of the light source control transistor TrU is connected to the light source signal line SULa(n). The other of the source and drain of the light source control transistor TrU is connected to the gate of the light source drive transistor TrD. In the example shown in FIG. 7 , the first light-emitting element 14IR and the second light-emitting element 14R arranged in a row are connected to one light source signal line SULa(n).

[0073] When the light source control transistor TrU is turned on (conductive), a predetermined voltage signal (hereinafter referred to as the light source control signal) is supplied from the light source control circuit 52 (see FIG. 6) to the gate of the light source drive transistor TrD through the light source signal line SULa(n). The light source control signal is set according to the light intensity of the first light-emitting element 14IR. In other words, the on state (drive current) of the light source drive transistor TrD changes according to the magnitude of the light source control signal supplied to the gate of the light source drive transistor TrD.

[0074] For example, if the light source control signal corresponds to a voltage signal that maximizes the light intensity of the first light-emitting element 14IR, the source-drain voltage of the light-source drive transistor TrD will open to a voltage corresponding to the maximum light intensity. As a result, the light-source drive transistor TrD passes a current corresponding to the maximum light intensity and supplies it to the first light-emitting element 14IR. At this time, the anode potential Vad is determined according to the drive current.

[0075] On the other hand, if the light source control signal corresponds to the minimum light intensity of the first light emitting element 14IR, i.e., the signal potential for black, the light source drive transistor TrD is turned off and no current is supplied to the first light emitting element 14IR.

[0076] In this way, the on state (drive current) of the light source drive transistor TrD changes with a magnitude corresponding to the potential of the light source control signal, and as a result, the current supplied to the first light-emitting element 14IR also corresponds to the on state of the light source drive transistor TrD.

[0077] The storage capacitor Cc is a capacitance formed between the gate and source (input side) of the light source drive transistor TrD.

[0078] The sensor drive circuit and light source drive circuit shown in FIG. 7 are merely examples and can be modified as appropriate. For example, each transistor shown in FIG. 7 is not limited to a p-type TFT, and may be an n-type TFT. Furthermore, a sensor pixel PX may be provided with multiple transistors corresponding to one light detection element 12. While FIG. 7 illustrates a configuration in which the light source drive circuit of the light emitting element 14 has two transistors (a light source drive transistor TrD and a light source control transistor TrU), the configuration is not limited thereto, and the light source drive circuit may have three or more transistors as needed.

[0079] Next, a method for detecting a detection object such as a finger Fg using the detection device 1 will be described. Fig. 8 is a timing chart showing an example of the operation of the detection device according to the first embodiment. Fig. 9 is a flowchart showing an example of the operation of the detection device according to the first embodiment.

[0080] 8 and 9 , of the first optical sensor 10 and the second optical sensor 20, the plurality of light sources 23 of the second optical sensor 20 are turned on, and of the first optical sensor 10 and the second optical sensor 20, the plurality of light detection elements 12 of the first optical sensor 10 output detection signals according to the irradiated light. That is, in the example shown in Fig. 8 and 9 , the detection device 1 detects a detection object such as a finger Fg in the transmission mode.

[0081] As shown in FIG. 9, the light source control circuit 52 supplies a control signal to the light source scanning circuit 27 of the second optical sensor 20 to drive the light source scanning circuit 27 (step ST1).

[0082] By driving the light source scanning circuit 27, the first light emitting element 24IR, the second light emitting element 24R, and the third light emitting element 24G of the light source 23 of the second optical sensor 20 are turned on (step ST2).

[0083] 8, the second optical sensor 20 sequentially lights up the first light-emitting element 24IR, the second light-emitting element 24R, and the third light-emitting element 24G in a time-division manner. The first light-emitting elements 24IR, the second light-emitting elements 24R, and the third light-emitting elements 24G are simultaneously lighted in their respective lighting periods.

[0084] At time t1, the light source scanning circuit 27 supplies a high-level voltage to all light source scanning lines GUL_IR of the sensor pixel PX, driving all light source control transistors TrU connected to the light source scanning lines GUL_IR. This turns on the light source drive transistor TrD connected to the first light-emitting element 24IR. At time t1, a drive current is supplied to the first light-emitting element 24IR, and all first light-emitting elements 24IR of the second optical sensor 20 are simultaneously illuminated (step ST2). At this time, the anode potential Vad is determined according to the drive current. Also, at time t1, the other second light-emitting element 24R and third light-emitting element 24G are not illuminated.

[0085] Next, the sensor control circuit 51 supplies a control signal to the sensor scanning circuit 16 of the first optical sensor 10 to drive the sensor scanning circuit 16 (step ST3).

[0086] The sensor scanning circuit 16 drives the plurality of light detection elements 12, which output detection signals corresponding to the light that is irradiated from the first light-emitting element 24IR and transmitted through the object to be detected, such as the finger Fg. The detection circuit 48 reads out the detection signals from the plurality of light detection elements 12 (step ST4).

[0087] More specifically, when light is irradiated onto the photodetection elements 12 of the first optical sensor 10, a current corresponding to the amount of near-infrared light from the first light-emitting element 24IR flows through the photodetection elements 12, causing charge to accumulate in the capacitance element Ca. At time t2, the light source control transistor TrU turns off. At time t3, a predetermined period after time t2, the sensor scanning circuit 16 of the first optical sensor 10 sequentially supplies high-level voltages to the sensor scanning lines GL1, GL2, GL3, ..., GLm. This sequentially turns on the drive transistors Tr of the first optical sensor 10 row by row, causing a current to flow through the integration circuit of the detection circuit 48 in accordance with the charge accumulated in the capacitance element Ca. As a result, the detection device 1 calculates the photocurrent for each sensor pixel PX.

[0088] At time t4, the first optical sensor 10 finishes scanning the photodetecting elements 12 from the first row to the last row, and completes detection for one frame based on the near-infrared light from the first light-emitting element 24IR.

[0089] After time t5, the detection device 1 repeatedly executes steps ST1 to ST4 shown in FIG. 9 to detect a detection object such as a finger Fg based on light of different wavelengths.

[0090] At time t5, the light source scanning circuit 27 supplies a high-level voltage to all light source scanning lines GUL_R of the sensor pixel PX, driving all light source control transistors TrU connected to the light source scanning lines GUL_R. This turns on the light source drive transistor TrD connected to the second light-emitting element 24R. At time t5, a drive current is supplied to the second light-emitting element 24R, and all second light-emitting elements 24R of the second optical sensor 20 are simultaneously turned on. At this time, the anode potential Vad is determined according to the drive current. Also, at time t5, the other first light-emitting element 24IR and third light-emitting element 24G are not turned on.

[0091] A current corresponding to the amount of red light from the second light-emitting element 24R flows through the photodetection element 12 of the first optical sensor 10, causing charge to accumulate in the capacitance element Ca. At time t6, the light source control transistor TrU turns off. At time t7, a predetermined period after time t6, the sensor scanning circuit 16 of the first optical sensor 10 sequentially supplies high-level voltages to the sensor scanning lines GL1, GL2, GL3, ..., GLm. As with the above-described period from time t3 to time t4, a current flows through the integration circuit of the detection circuit 48, and as a result, the detection device 1 calculates a photocurrent for each sensor pixel PX.

[0092] At time t8, the first optical sensor 10 finishes scanning the photodetecting elements 12 from the first row to the last row, and completes detection for one frame based on the near-infrared light from the second light-emitting element 24R.

[0093] At time t9, the light source scanning circuit 27 supplies a high-level voltage to all light source scanning lines GUL_G of the sensor pixel PX, turning on all light source control transistors TrU connected to the light source scanning lines GUL_G. This drives the light source drive transistor TrD connected to the third light-emitting element 24G. At time t9, a drive current for the third light-emitting element 24G is supplied, and all third light-emitting elements 24G of the second optical sensor 20 are simultaneously turned on. At this time, the anode potential Vad is determined according to the drive current. Also, at time t9, the other first light-emitting elements 24IR and second light-emitting elements 24R are turned off.

[0094] A current corresponding to the amount of green light from the third light-emitting element 24G flows through the photodetection element 12 of the first optical sensor 10, causing charge to accumulate in the capacitance element Ca. At time t10, the light source control transistor TrU turns off. At time t11, a predetermined period after time t6, the sensor scanning circuit 16 of the first optical sensor 10 sequentially supplies high-level voltages to the sensor scanning lines GL1, GL2, GL3, ..., GLm. As with time t3 to t4 described above, a current flows through the integration circuit of the detection circuit 48, and as a result, the detection device 1 calculates a photocurrent for each sensor pixel PX.

[0095] At time t12, the first optical sensor 10 finishes scanning the photodetecting elements 12 from the first row to the last row, and completes detection for one frame based on the green light from the third light-emitting element 24G.

[0096] As described above, in the transmission mode, the detection device 1 can detect a detection object such as a finger Fg by using the first optical sensor 10 as a light detection device and the second optical sensor 20 as a light source.

[0097] 8 and 9 are merely examples and can be modified as appropriate. For example, in the transmission mode, the detection device 1 may use the second optical sensor 20 as a light detection device and the first optical sensor 10 as a light source. That is, in the transmission mode, of the first optical sensor 10 and the second optical sensor 20, the multiple light sources 13 of the first optical sensor 10 may be turned on, and of the first optical sensor 10 and the second optical sensor 20, the multiple light detection elements 22 of the second optical sensor 20 may output detection signals corresponding to the irradiated light.

[0098] Next, a method for generating sensor correction data for the detection device 1 will be described. Fig. 10 is a flowchart showing an example of the method for generating sensor correction data. Fig. 11 is an explanatory diagram for explaining step ST11 in Fig. 10. Fig. 12 is an explanatory diagram for explaining the method for generating sensor correction data in Fig. 10.

[0099] The sensor correction data is generated based on sensor output data acquired from the multiple light detection elements 12 of the first optical sensor 10 when the multiple light sources 23 of the second optical sensor 20 are turned on in the absence of a detectable object such as a predetermined finger Fg. That is, the following description will be given of a case where the second optical sensor 20 is used as a light source and the first optical sensor 10 is used as an optical sensor. However, this is not limiting, and in generating the sensor correction data, the multiple light sources 13 of the first optical sensor 10 may be turned on and sensor output data may be acquired from the multiple light detection elements 22 of the second optical sensor 20.

[0100] In the flow of generating sensor correction data, as shown in FIGS. 10 and 11 , when there is no object to be detected, such as a finger Fg, the light intensity adjustment sheet 32 ​​is inserted between the first optical sensor 10 and the second optical sensor 20 (step ST11). The light intensity adjustment sheet 32 ​​is a translucent, flat-plate-shaped member. Light emitted from the light source 23 of the second optical sensor 20 passes through the light intensity adjustment sheet 32, thereby being attenuated to a light intensity detectable by each light detection element 12 of the first optical sensor 10. The light intensity adjustment sheet 32 ​​has a constant thickness, allowing the distance between the first optical sensor 10 and the second optical sensor 20 to be adjusted to a constant value. Note that the light intensity adjustment sheet 32 ​​may be omitted. In this case, the second optical sensor 20 and the first optical sensor 10 may be arranged opposite each other so that their entire surfaces are in contact with each other.

[0101] 12 , in the flow of generating sensor correction data, the second optical sensor 20 turns on each light-emitting element 24 of the light source 23 at different light intensities, and the first optical sensor 10 acquires sensor output data for each different light intensity. In the example shown in FIG. 12 , the second optical sensor 20 turns on each light-emitting element 24 of the light source 23 at 10 different light intensities.

[0102] 10, first, the light source control circuit 52 (see FIG. 6) sets the light intensity of the light emitted from the light source 23 of the second optical sensor 20 (step ST12). The light source control circuit 52 supplies a light source control signal corresponding to the set light intensity to the light source signal line SUL. As a result, each light emitting element 24 of the light source 23 lights up at the set light intensity (step ST13).

[0103] Light emitted from the light source 23 passes through the light intensity adjustment sheet 32 ​​and is irradiated onto the light detection element 12 of the first optical sensor 10. The light detection element 12 outputs an electrical signal corresponding to the intensity of the irradiated light. The detection circuit 48 performs the predetermined processing described above based on the electrical signal output from the light detection element 12 and outputs sensor output data. As a result, the correction data generation circuit 53 (see FIG. 6) obtains sensor output data corresponding to the set light intensity (step ST14).

[0104] Next, the correction data generating circuit 53 determines whether or not the detection of all preset light intensities has been completed (step ST15).

[0105] If detection of all preset light intensities has not been completed (No in step ST15), the light source control circuit 52 changes the light intensity and executes steps ST12 to ST14.

[0106] When the detection of all light intensities has been completed (Yes in step ST15), the correction data generating circuit 53 generates sensor correction data based on the acquired sensor output data (step ST16).

[0107] 12, in step ST16, the correction data generation circuit 53 generates sensor correction data a1, a2, a3, ..., a10 for each different light intensity based on the difference between the acquired sensor output data So and the sensor reference data REF. The correction data generation circuit 53 also generates sensor correction data a1, a2, a3, ..., a10 for each of the multiple light detection elements 12. The sensor reference data REF is a reference value that indicates the relationship between the light intensity and the sensor output data So, and is stored in advance in the memory circuit 54 (see FIG. 6).

[0108] As described above, the correction data generation circuit 53 generates sensor correction data according to the flows shown in Figures 10 to 12. The sensor correction data is stored in the memory circuit 54 (see Figure 5). The sensor correction data is generated at a predetermined timing, for example, when the detection device 1 is powered on. If the sensor correction data has already been acquired, the flows shown in Figures 10 to 12 may be omitted.

[0109] The sensor control circuit 51 (see FIG. 6 ) may correct the sensor output data based on the sensor correction data when measuring the finger Fg in step ST4 of FIG. 9 . The sensor output data corrected based on the sensor correction data is stored in the memory circuit 54. By correcting the sensor output data based on the sensor correction data, the detection device 1 can suppress errors in the sensor output data caused by variations in the detection characteristics of the multiple light detection elements 12 of the first optical sensor 10 and variations in the light intensity of the multiple light sources 23 of the second optical sensor 20. Therefore, the detection device 1 can improve the detection accuracy of a detection object such as a finger Fg.

[0110] 10 to 12 are merely examples and can be modified as appropriate. For example, the present invention is not limited to the case where the first optical sensor 10 and the second optical sensor 20 are attached together in a bag shape, but can also be applied to a configuration where the first optical sensor 10 and the second optical sensor 20 are wound in a ring shape (cylindrical shape) (second embodiment described later).

[0111] 13 is a plan view schematically showing a plurality of sensor pixels of a detection device according to a first modified example. In the following description, the same components as those described in the above embodiment are denoted by the same reference numerals, and redundant description will be omitted.

[0112] Figure 13 describes the configuration of the multiple sensor pixels PX (photodetection element 12 and multiple light-emitting elements 14) that the first optical sensor 10 has, but the multiple sensor pixels PX (photodetection element 22 and multiple light-emitting elements 24) that the second optical sensor 20 has also have a similar configuration, and the description of the multiple sensor pixels PX that the first optical sensor 10 has can also be applied to the multiple sensor pixels PX that the second optical sensor 20 has.

[0113] 13 , in the multiple sensor pixels PX of the first optical sensor 10, the first light-emitting element 14IR, the second light-emitting element 14R, and the third light-emitting element 14G are provided to surround the photodetection element 12. The photodetection element 12 is disposed at the center of the sensor pixel PX, and the first light-emitting element 14IR, the second light-emitting element 14R, and the third light-emitting element 14G are formed in a frame shape surrounding the photodetection element 12. The third light-emitting element 14G that emits green light, the second light-emitting element 14R that emits red light, and the first light-emitting element 14IR that emits near-infrared light are arranged in this order from the photodetection element 12 toward the outer edge of the sensor pixel PX.

[0114] The areas of the first light-emitting element 14IR, the second light-emitting element 14R, and the third light-emitting element 14G increase in the order of the first light-emitting element 14IR, the second light-emitting element 14R, and the third light-emitting element 14G. That is, the shorter the wavelength of light emitted from each light-emitting element 14, the larger the area.

[0115] The widths Wx_IR, Wx_R, and Wx_G of the first light-emitting element 14IR, the second light-emitting element 14R, and the third light-emitting element 14G in the first direction Dx are widths of the portions of each light-emitting element 14 extending in the second direction Dy in a direction (first direction Dx) perpendicular to the sides of the light-detecting element 12. The width Wx_IR of the first light-emitting element 14IR increases in this order, followed by the width Wx_R of the second light-emitting element 14R and the width Wx_G of the third light-emitting element 14G. Furthermore, the width Wx_PD of the light-detecting element 12 in the first direction Dx may be larger than the widths Wx_IR, Wx_R, and Wx_G.

[0116] The widths Wy_IR, Wy_R, and Wy_G of the first light-emitting element 14IR, the second light-emitting element 14R, and the third light-emitting element 14G in the second direction Dy are widths of the portions of each light-emitting element 14 extending in the first direction Dx in a direction perpendicular to the sides of the light-detecting element 12 (the second direction Dy). The width Wy_IR of the first light-emitting element 14IR increases in this order, followed by the width Wy_R of the second light-emitting element 14R and the width Wy_G of the third light-emitting element 14G. Furthermore, the width Wy_PD of the light-detecting element 12 in the second direction Dy may be greater than the widths Wy_IR, Wy_R, and Wy_G.

[0117] With this configuration, the area of ​​the light-emitting element 14 is made larger as the wavelength of the emitted light becomes shorter, thereby improving the intensity of light with a short wavelength in detection by the detection device 1. Therefore, even if light with a short wavelength is scattered when it passes through or reflects off a detection object such as a finger Fg, the light still enters the light-detecting element 12 satisfactorily. Therefore, the detection device 1 can satisfactorily detect a detection object such as a finger Fg even with light having a relatively short wavelength.

[0118] 14 is a circuit diagram showing a sensor pixel of a detection device according to a second modification. Note that, although the sensor pixel PX of the first optical sensor 10 is described in Fig. 14, the circuit configuration shown in Fig. 14 can also be applied to the sensor pixel PX of the second optical sensor 20.

[0119] In the second modification, the light source scanning line GUL is provided as a scanning line common to the first light-emitting element 14IR, the second light-emitting element 14R, and the third light-emitting element 14G. The gates of the light source control transistors TrU of the first light-emitting element 14IR, the second light-emitting element 14R, and the third light-emitting element 14G are connected to one light source scanning line GUL.

[0120] When a high-level voltage is supplied to the light source scanning line GUL, the light source control transistors TrU of the first light-emitting element 14IR, the second light-emitting element 14R, and the third light-emitting element 14G are turned on. As in the first embodiment, one light source signal line SULa(n) is provided in common to the first light-emitting element 14IR and the second light-emitting element 14R. A light source signal line SULb(n) is provided corresponding to the third light-emitting element 14G.

[0121] In the second modification, a common gate voltage is input to the plurality of light source control transistors TrU, so that the light emitting elements 14 are driven simultaneously, and a current corresponding to the signal from the light source signal lines SULa(n) and SULb(n) passes through the light source drive transistor TrD and is supplied to each light emitting element 14. The anode potentials Vad_IR, Vad_R, and Vad_G are determined according to this drive current.

[0122] The sensor pixel PX of the second modified example can have a smaller number of light source scanning lines GUL than the sensor pixel PX of the first embodiment, which allows the area of ​​the sensor pixel PX to be reduced.

[0123] Second Embodiment Fig. 15 is a development view showing an example of development of substrates of a first optical sensor and a second optical sensor of a detection device according to a second embodiment. Fig. 16 is a plan view showing an example of the configuration of a scanning circuit, external connection terminals, and wiring of the detection device according to the second embodiment.

[0124] 15, the detection device 1A according to the second embodiment has a first substrate 11A and a second substrate 11B. The two substrates (first substrate 11A and second substrate 11B) of the first optical sensor 10A and the second optical sensor 20A are attached together in the shape of a bag having an opening OP (see FIG. 1) along one side. The first substrate 11A and the second substrate 11B are each formed of a flexible substrate.

[0125] More specifically, the first optical sensor 10A includes a first substrate 11A, a plurality of sensor pixels PX (photodetection elements 12 and light sources 13) arranged in a matrix on the first substrate 11A, third external connection terminals 15, and an adhesive layer 19. The adhesive layer 19 is provided in regions along the second side S2a, third side S3a, and fourth side S4a of the first substrate 11A. The adhesive layer 19 is not provided in a region along the first side S1a of the first substrate 11A.

[0126] The second optical sensor 20A includes a second substrate 11B, a plurality of sensor pixels PX (photodetection elements 22 and light sources 23) arranged in a matrix on the second substrate 11B, second external connection terminals 25, and an adhesive layer 29. The adhesive layer 29 is provided in regions along the second side S2b, the third side S3b, and the fourth side S4b of the second substrate 11B. The adhesive layer 29 is not provided in a region along the first side S1b of the second substrate 11B.

[0127] The adhesive layers 19 and 29 bond together the regions along the second side S2a, the third side S3a, and the fourth side S4a of the first substrate 11A and the regions along the second side S2b, the third side S3b, and the fourth side S4b of the second substrate 11B. The region along the first side S1a of the first substrate 11A and the region along the first side S1b of the second substrate 11B are not bonded together, forming an opening OP.

[0128] The first substrate 11A is provided with third external connection terminals 15, and the second substrate 11B is provided with second external connection terminals 25. When the first substrate 11A and the second substrate 11B are arranged opposite each other, the third external connection terminals 15 and the second external connection terminals 25 are arranged overlapping each other and are electrically connected. The plurality of photodetector elements 22 and the plurality of light sources 23 provided on the second substrate 11B are electrically connected to an external wiring substrate 30 through the third external connection terminals 15 and the second external connection terminals 25.

[0129] Note that the third external connection terminal 15 and the second external connection terminal 25 shown in Figure 15 are schematically depicted with a simplified configuration, and the connection configuration between the multiple light detection elements 22 and multiple light sources 23 and the external wiring board 30 will be described with reference to Figure 16.

[0130] 16 , in the first optical sensor 10A, the first external connection terminal T1 and the third external connection terminal 15 are provided in an area along the second side S2a of the first substrate 11A. An external wiring substrate 30 is connected to the first external connection terminal T1. A sensor scanning circuit 16A provided on the first substrate 11A is electrically connected to the wiring substrate 30 through wiring L1 and the first external connection terminal T1. A light source scanning circuit 17A is electrically connected to the wiring substrate 30 through wiring L2 and the first external connection terminal T1. A plurality of sensor pixels PX (a plurality of photodetection elements 12 and a plurality of light-emitting elements 14) provided on the first substrate 11A are electrically connected to the external wiring substrate 30 through wiring L3 and the first external connection terminal T1.

[0131] In the second optical sensor 20A, the second external connection terminals 25 are provided in an area along the second side S2b of the second substrate 11B. The second external connection terminals 25 provided on the second substrate 11B include second external connection terminals 25a, 25b, 25c, and 25d. The third external connection terminals 15 provided on the first substrate 11A include third external connection terminals 15a, 15b, 15c, and 15d. The third external connection terminals 15a, 15b, 15c, and 15d are electrically connected to the second external connection terminals 25a, 25b, 25c, and 25d, respectively.

[0132] The sensor scanning circuit 26A provided on the second substrate 11B is electrically connected to the third external connection terminal 15c on the first substrate 11A side through the wiring L11 and the second external connection terminal 25c. The sensor scanning circuit 26A is also electrically connected to the wiring substrate 30 through the third external connection terminal 15c and the first external connection terminal T1.

[0133] The light source scanning circuit 27A provided on the second substrate 11B is electrically connected to the third external connection terminal 15d on the first substrate 11A side through the wiring L14 and the second external connection terminal 25d. The light source scanning circuit 27A is electrically connected to the wiring substrate 30 through the third external connection terminal 15d and the first external connection terminal T1.

[0134] The photodetecting elements 22 and the light-emitting elements 24 arranged on the second substrate 11B are electrically connected to the outside through the second external connection terminals 25. More specifically, the photodetecting elements 22 are electrically connected to the third external connection terminals 15a on the first substrate 11A side through the wiring L12 and the second external connection terminals 25a. The photodetecting elements 22 are electrically connected to the wiring substrate 30 through the third external connection terminals 15a and the first external connection terminals T1.

[0135] The plurality of light-emitting elements 24 are electrically connected to the third external connection terminal 15b on the first substrate 11A side through the wiring L13 and the second external connection terminal 25b, and are electrically connected to the wiring substrate 30 through the third external connection terminal 15b and the first external connection terminal T1.

[0136] As described above, in the detection device 1A of the second embodiment, even if the first optical sensor 10A and the second optical sensor 20A are formed on separate substrates (the first substrate 11A and the second substrate 11B), each sensor pixel PX of the second optical sensor 20A is electrically connected to the first substrate 11A through the second external connection terminal 25 and the third external connection terminal 15. As a result, even if the first external connection terminal T1 is provided only on the first substrate 11A, the second optical sensor 20A is electrically connected well to the external control circuit 50.

[0137] 17 is a schematic diagram showing an example of the appearance of a detection device according to a third embodiment with a finger placed inside, and FIG. 18 is a plan view showing an example of the configuration of a scanning circuit, external connection terminals, and wiring of the detection device according to the third embodiment.

[0138] 17 , the detection device 1B according to the third embodiment is a ring-shaped or cylindrical device that has openings OP on one end and the other end and is detachable from the human body. The detection device 1B is worn by being wrapped around a finger Fg of the human body, for example.

[0139] 18, the first optical sensor 10B and the second optical sensor 20B are provided on a common integrated substrate 11C. The substrate 11C is a flexible substrate that is provided so as to be deformable into a ring shape.

[0140] When the detection device 1B is worn on a finger Fg, the first side S1 and the second side S2 of the substrate 11C curve along the circumferential direction of the finger Fg. The region along the fourth side S4 of the substrate 11C overlaps with the region along the third side S3. This results in the substrate 11C being formed in a ring or cylindrical shape with openings OP on the first side S1 and the second side S2. If necessary, an adhesive layer may be provided on at least one of the region along the fourth side S4 and the region along the third side S3 of the substrate 11C.

[0141] The plurality of sensor pixels PX are arranged on the substrate 11C along the first direction Dx (circumferential direction). A virtual line that passes through the midpoint of the plurality of sensor pixels PX in the first direction Dx and is parallel to the second direction Dy is defined as a virtual center line C. The plurality of sensor pixels PX located in the region between the virtual center line C and the third side S3 of the substrate 11C (the region on the left in FIG. 18 ) correspond to the first optical sensors 10B. The plurality of sensor pixels PX located in the region between the virtual center line C and the fourth side S4 of the substrate 11C (the region on the right in FIG. 18 ) correspond to the second optical sensors 20B.

[0142] In other words, the plurality of sensor pixels PX of the first optical sensor 10B and the plurality of sensor pixels PX of the second optical sensor 20B are arranged adjacent to each other in the first direction Dx on the substrate 11C.

[0143] The sensor scanning circuit 16B is provided in an area along the second side S2 that intersects with the third side S3 of the substrate 11C. The light source scanning circuit 17B is provided in an area along the first side S1 that intersects with the third side S3 of the substrate 11C. That is, the sensor scanning circuit 16B and the light source scanning circuit 17B are provided in an area along a side of the substrate 11C that is different from the side on which the first external connection terminals T1 are provided. In addition, in the second direction Dy, the multiple sensor pixels PX (first optical sensors 10B and second optical sensors 20B) are arranged between the sensor scanning circuit 16B and the light source scanning circuit 17B.

[0144] The plurality of photodetection elements 12 of the first optical sensor 10B and the plurality of photodetection elements 22 of the second optical sensor 20B are scanned by a common sensor scanning circuit 16B. Furthermore, the plurality of light-emitting elements 14 of the first optical sensor 10B and the plurality of light-emitting elements 24 of the second optical sensor 20B are scanned by a common light source scanning circuit 17B. The plurality of photodetection elements 12, 22 and the plurality of light-emitting elements 14, 24 of the first optical sensor 10B and the second optical sensor 20B are electrically connected to the wiring substrate 30 via wiring L3 and the first external connection terminal T1.

[0145] Fig. 19 is an explanatory diagram for explaining an example of a detection method in a transmission mode of the detection device according to the third embodiment. Fig. 20 is a timing chart showing an example of operation in a transmission mode of the detection device according to the third embodiment. Figs. 21, 22, and 23 are diagrams showing examples of pulse waveforms acquired at each sensor pixel.

[0146] 19, among the plurality of sensor pixels PX, those in which a plurality of light-emitting elements 14, 24 are turned on and used as a light source are shown as light source pixels PXL. Among the plurality of sensor pixels PX, those in which a plurality of light-detecting elements 12, 22 are driven and used as a photosensor are shown as detection pixels PXS. Furthermore, FIG. 20 shows an example of the operation in step ST22 in FIG. 19.

[0147] 19 , in the transmission mode, the detection device 1B sequentially scans the photodetecting elements 12, 22 of the first optical sensor 10B and the second optical sensor 20B along the circumferential direction of the finger Fg. The detection device 1B also turns on the multiple light-emitting elements 14, 24 located on the opposite side of the photodetecting elements 12, 22 that are the detection target. This allows the detection device 1B to select the multiple light-emitting elements 14, 24 and multiple light-detecting elements 12, 22 that detect the maximum pulse wave (AC component) from among the multiple light-emitting elements 14, 24 and multiple light-detecting elements 12, 22 arranged along the circumferential direction of the finger Fg.

[0148] 19, the light-emitting element 24 (second optical sensor 20B) of the light source pixel PXL located on the right side of the finger Fg lights up. The light-detecting element 12 (first optical sensor 10B) of the detection pixel PXS located on the left side of the finger Fg, opposite the light source pixel PXL, performs detection based on the light that has passed through the finger Fg (step ST21).

[0149] Next, the light-emitting element 24 (second optical sensor 20B) of the light source pixel PXL located above the finger Fg in Fig. 19 lights up. The light-detecting element 12 (first optical sensor 10B) of the detection pixel PXS located below the finger Fg on the opposite side to the light source pixel PXL performs detection based on the light that has passed through the finger Fg (step ST22).

[0150] Next, the light-emitting element 14 (first optical sensor 10B) of the light source pixel PXL located on the left side of the finger Fg in Fig. 19 lights up. The light-detecting element 22 (second optical sensor 20B) of the detection pixel PXS located on the right side of the finger Fg, opposite the light source pixel PXL, detects the light based on the light that has passed through the finger Fg (step ST23).

[0151] Next, the light-emitting element 14 (first optical sensor 10B) of the light source pixel PXL located below the finger Fg in Fig. 19 lights up. The light-detecting element 22 (second optical sensor 20B) of the detection pixel PXS located above the finger Fg on the opposite side to the light source pixel PXL performs detection based on the light that has passed through the finger Fg (step ST24).

[0152] As shown in FIG. 20, for example, in step ST22, at time t21, the light source scanning circuit 17B selects, from the light source scanning lines GUL, light source scanning lines GUL1 to GUL5 that correspond to the light source pixels PXL, and supplies a high-level voltage to the light source scanning lines GUL1 to GUL5.

[0153] At time t21, a drive current (or an anode potential Vad) is supplied to the plurality of first light-emitting elements 24IR corresponding to the light source pixels PXL, and the plurality of first light-emitting elements 24IR corresponding to the light source pixels PXL are simultaneously turned on. Also, at time t21, the second light-emitting element 24R and the third light-emitting element 24G corresponding to the light source pixels PXL are turned off. Also, the other sensor pixels PX other than the light source pixels PXL are turned off.

[0154] At time t22, the light source scanning circuit 17B stops supplying high-level voltages to the light source scanning lines GUL1 to GUL5. Between time t23 and time t24, the sensor scanning circuit 16B sequentially supplies high-level voltages to the sensor scanning lines GL11 to GL20, which correspond to the detection pixels PXS, among the sensor scanning lines GL. This sequentially turns on the drive transistors Tr of the detection pixels PXS row by row, and current flows through the integration circuit of the detection circuit 48 in accordance with the charge accumulated in the capacitance element Ca. As a result, the detection device 1 calculates a photocurrent for each detection pixel PXS based on the near-infrared light emitted from the first light-emitting element 24IR and transmitted through the finger Fg.

[0155] At time t25, a drive current (or an anode potential Vad) is supplied to the second light-emitting elements 24R corresponding to the light source pixels PXL, and the second light-emitting elements 24R corresponding to the light source pixels PXL are simultaneously turned on. Also, at time t25, the first light-emitting elements 24IR and the third light-emitting element 24G corresponding to the light source pixels PXL are turned off. Also, the other sensor pixels PX other than the light source pixels PXL are turned off.

[0156] During the period from time t26 to time t27, the sensor scanning circuit 16B sequentially supplies a high-level voltage to the sensor scanning lines GL11 to GL20 corresponding to the detection pixels PXS among the sensor scanning lines GL. As a result, the drive transistors Tr of the detection pixels PXS are sequentially turned on row by row, and a current flows through the integration circuit of the detection circuit 48 according to the charge accumulated in the capacitance element Ca. As a result, the detection device 1 calculates a photocurrent for each detection pixel PXS based on the red light emitted from the second light-emitting element 24R and transmitted through the finger Fg.

[0157] At time t28, a drive current (or an anode potential Vad) is supplied to the plurality of third light-emitting elements 24G corresponding to the light source pixels PXL, and the plurality of third light-emitting elements 24G corresponding to the light source pixels PXL simultaneously light up. Also, at time t28, the first light-emitting element 24IR and the second light-emitting element 24R corresponding to the light source pixels PXL are turned off. Also, the other sensor pixels PX other than the light source pixels PXL are turned off.

[0158] During the period from time t29 to time t30, the sensor scanning circuit 16B sequentially supplies a high-level voltage to the sensor scanning lines GL11 to GL20 corresponding to the detection pixels PXS among the sensor scanning lines GL. As a result, the drive transistors Tr of the detection pixels PXS are sequentially turned on row by row, and a current flows through the integration circuit of the detection circuit 48 in accordance with the charge accumulated in the capacitance element Ca. As a result, the detection device 1 calculates a photocurrent for each detection pixel PXS based on the green light emitted from the third light-emitting element 24G and transmitted through the finger Fg.

[0159] 21, 22 and 23, the horizontal axis indicates time, and the vertical axis indicates the data value of the pulse wave data.

[0160] The signal strength of the pulse wave data acquired in steps ST21 to ST24 of Fig. 19 varies depending on the distribution of blood vessels under the skin of the finger Fg. The signal strength of the pulse wave data is indicated by the AC (alternating current) component of the pulse wave data shown in Figs. 21, 22, and 23. Specifically, for example, the signal strength indicated by the AC component of the pulse wave data shown in Fig. 22 is relatively high compared to the signal strength indicated by the AC component of the pulse wave data shown in Fig. 21 and the signal strength indicated by the AC component of the pulse wave data shown in Fig. 23. For example, in the positional relationship between the finger Fg, the light source pixel PXL, and the detection pixel PXS in step ST22 of Fig. 19, pulse wave data having a relatively high signal strength as shown in Fig. 22 can be acquired.

[0161] In the present disclosure, the light source pixels PXL and the detection pixels PXS are scanned, and, as shown in FIG. 22 , positions of the light source pixels PXL and the detection pixels PXS where the signal strength indicated by the AC component of the acquired pulse wave data is relatively large are selected, and detection is performed using the light-emitting elements 14, 24 of the selected light source pixels PXL and the photodetector elements of the detection pixels PXS. This allows detection to be performed using the light source pixels PXL and the detection pixels PXS where the AC component of the pulse wave data is greatest, even if the relative positional relationship between the detection object, such as a finger Fg, and the detection device 1 in the circumferential direction is shifted. Therefore, the detection device 1B can improve detection accuracy.

[0162] Fig. 24 is an explanatory diagram for explaining an example of a detection method in the reflection mode of the detection device according to the third embodiment. Fig. 25 is a timing chart showing an example of the operation of the detection device according to the third embodiment in the reflection mode.

[0163] 24 , in reflective mode detection, the detection device 1B sequentially scans the photodetecting elements of the first optical sensor 10B and the second optical sensor 20B along the circumferential direction of the finger Fg. The detection device 1B also turns on the light-emitting elements 14, 24 adjacent to the photodetecting element to be detected. This allows the detection device 1B to select the light-emitting elements 14, 24 and the photodetecting elements 12, 22 that detect the maximum pulse wave (AC component) from among the light-emitting elements 14, 24 and the photodetecting elements 12, 22 arranged along the circumferential direction of the finger Fg.

[0164] More specifically, the light-emitting elements 14 (first optical sensors 10B) of the light source pixels PXL1 and PXL2 located on the left side of the finger Fg in Fig. 24 are turned on. The light-detecting element 12 (first optical sensors 10B) of the detection pixel PXS located between the light source pixels PXL1 and PXL2 on the left side of the finger Fg performs detection based on the light reflected by the finger Fg (step ST31).

[0165] Next, the light-emitting elements 14 (first optical sensors 10B) of the light source pixels PXL1 and PXL2 located below the finger Fg in Fig. 24 are turned on. The light-detecting elements 12 (first optical sensors 10B) of the detection pixels PXS located below the finger Fg between the light source pixels PXL1 and PXL2 perform detection based on the light reflected by the finger Fg (step ST32).

[0166] Next, the light-emitting elements 24 (second optical sensors 20B) of the light source pixels PXL1 and PXL2 located on the right side of the finger Fg in Fig. 24 are turned on. The light-detecting element 22 (second optical sensors 20B) of the detection pixel PXS located between the light source pixels PXL1 and PXL2 on the right side of the finger Fg performs detection based on the light reflected by the finger Fg (step ST33).

[0167] Next, the light-emitting elements 24 (second optical sensors 20B) of the light source pixels PXL1 and PXL2 located above the finger Fg in Fig. 24 are turned on. The light-detecting elements 22 (second optical sensors 20B) of the detection pixels PXS located above the finger Fg between the light source pixels PXL1 and PXL2 perform detection based on the light reflected by the finger Fg (step ST34).

[0168] As shown in FIG. 25 , for example, in step ST33 of FIG. 24 , at time t31, the light source scanning circuit 17B selects, from the light source scanning lines GUL, light source scanning lines GUL6 to GUL10 and light source scanning lines GUL21 to GUL25 that correspond to the light source pixels PXL1 and PXL2, and supplies a high-level voltage to each of the selected light source scanning lines GUL.

[0169] At time t31, a drive current (or an anode potential Vad) is supplied to the first light-emitting elements 24IR (second optical sensors 20B) corresponding to the light source pixels PXL1 and PXL2, and the first light-emitting elements 24IR corresponding to the light source pixels PXL1 and PXL2 are simultaneously turned on. Also, at time t31, the other second light-emitting elements 24R and third light-emitting elements 24G are turned off.

[0170] At time t32, the light source scanning circuit 17B stops supplying high-level voltages to the light source scanning lines GUL6 to GUL10 and the light source scanning lines GUL21 to GUL25. During the period from time t33 to time t34, a predetermined period after time t32, the sensor scanning circuit 16B sequentially supplies high-level voltages to the sensor scanning lines GL11 to GL20 corresponding to the detection pixels PXS. As a result, the drive transistors Tr of the detection pixels PXS are sequentially turned on row by row, and a current flows through the integration circuit of the detection circuit 48 in accordance with the charge accumulated in the capacitance element Ca. As a result, the detection device 1 calculates a photocurrent for each detection pixel PXS based on the near-infrared light emitted from the first light-emitting element 24IR and reflected by the finger Fg.

[0171] At time t35, a drive current (or an anode potential Vad) is supplied to the second light-emitting elements 24R (second optical sensors 20B) corresponding to the light source pixels PXL1 and PXL2, and the second light-emitting elements 24R corresponding to the light source pixels PXL1 and PXL2 are simultaneously turned on. Also, at time t35, the other first light-emitting elements 24IR and third light-emitting elements 24G are turned off.

[0172] During the period from time t36 to time t37, the sensor scanning circuit 16B sequentially supplies a high-level voltage to the sensor scanning lines GL11 to GL20 corresponding to the detection pixels PXS among the sensor scanning lines GL. As a result, the drive transistors Tr of the detection pixels PXS are sequentially turned on row by row, and a current flows through the integration circuit of the detection circuit 48 according to the charge accumulated in the capacitance element Ca. As a result, the detection device 1 calculates a photocurrent for each detection pixel PXS based on the red light emitted from the second light-emitting element 24R and reflected by the finger Fg.

[0173] At time t38, a drive current (or an anode potential Vad) is supplied to the third light-emitting elements 24G (second optical sensors 20B) corresponding to the light source pixels PXL1 and PXL2, and the third light-emitting elements 24G corresponding to the light source pixels PXL1 and PXL2 are simultaneously turned on. Also, at time t38, the other first light-emitting elements 24IR and second light-emitting elements 24R are turned off.

[0174] During the period from time t39 to time t40, the sensor scanning circuit 16B sequentially supplies a high-level voltage to the sensor scanning lines GL11 to GL20 corresponding to the detection pixels PXS among the sensor scanning lines GL. As a result, the drive transistors Tr of the detection pixels PXS are sequentially turned on row by row, and a current flows through the integration circuit of the detection circuit 48 according to the charge accumulated in the capacitance element Ca. As a result, the detection device 1 calculates a photocurrent for each detection pixel PXS based on the green light emitted from the third light-emitting element 24G and reflected by the finger Fg.

[0175] In the reflective mode, similar to the example shown in Fig. 22, the positions of the light source pixels PXL1, PXL2 and the detection pixel PXS where the signal strength indicated by the AC component of the acquired pulse wave data is relatively large are selected, and detection operation is performed using the light emitting elements 14, 24 of the selected light source pixels PXL1, PXL2 and the photodetector element of the detection pixel PXS. For example, pulse wave data with a relatively large signal strength can be acquired in the positional relationship between the finger Fg and the light source pixels PXL1, PXL2 and the detection pixel PXS in step ST32 of Fig. 24.

[0176] 19 to 25 are merely examples and can be modified as appropriate. For example, the light source pixels PXL, PXL1, PXL2, and the detector pixels PXS shown in FIGS. 19 and 24 can be set in any manner depending on the type of object to be detected and the biological information to be acquired. In FIGS. 19 and 24, different areas of the light source pixels PXL, PXL1, PXL2, and the detector pixels PXS are selected in each step, but this is not limited thereto, and the light source pixels PXL, PXL1, PXL2, and the detector pixels PXS can be scanned so that they overlap or are continuous in each step.

[0177] Although preferred embodiments of the present disclosure have been described above, the present disclosure is not limited to such embodiments. The contents disclosed in the embodiments are merely examples, and various modifications are possible within the scope of the present disclosure. Appropriate modifications made within the scope of the present disclosure naturally fall within the technical scope of the present disclosure. At least one of various omissions, substitutions, and modifications of components can be made within the scope of the gist of each of the above-described embodiments and modifications.

[0178] 1, 1A, 1B Detection device 10, 10A, 10B First optical sensor 11, 11C Substrate 11A First substrate 11B Second substrate 12, 22 Optical detection element 13, 23 Light source 14, 24 Light-emitting element 14IR, 24IR First light-emitting element 14R, 24R Second light-emitting element 14G, 24G Third light-emitting element 15, 15a, 15b, 15c, 15d Third external connection terminal 16, 16A, 16B, 26, 26A Sensor scanning circuit 17, 17A, 17B, 27, 27A Light source scanning circuit 18, 28 Sealing film 20, 20A, 20B Second optical sensor 25, 25a, 25b, 25c, 25d Second external connection terminal 30 Wiring substrate 32 Light intensity adjustment sheet 35, 36 Light-shielding layer 48 Detection circuit OP Opening T1 First external connection terminal PX Sensor pixel PXL, PXL1, PXL2 Light source pixel PXS Detection pixel

Claims

1. A detection device comprising: a first optical sensor and a second optical sensor each including a substrate, a plurality of light detection elements and a plurality of light sources arranged in a plane on the substrate, and arranged opposite each other; and a light-shielding layer provided on the back surface of the substrate of each of the first optical sensor and the second optical sensor, wherein the substrate of each of the first optical sensor and the second optical sensor is a flexible substrate and at least one end is connected to each other; each of the first optical sensor and the second optical sensor includes a plurality of sensor pixels arranged in a matrix, and each of the plurality of sensor pixels includes the light detection element and the light source.

2. The detection device according to claim 1, wherein the plurality of light sources of one of the first optical sensor and the second optical sensor are turned on, and the plurality of light detection elements of the other of the first optical sensor and the second optical sensor output a detection signal according to the irradiated light.

3. The detection device according to claim 1, wherein the light source of one of the first optical sensor and the second optical sensor is turned on, the plurality of light detection elements of one of the first optical sensor and the second optical sensor output a detection signal according to the irradiated light, the plurality of light sources of the other of the first optical sensor and the second optical sensor are not turned on, and the plurality of light detection elements of the other of the first optical sensor and the second optical sensor stop detection.

4. The detection device according to claim 1, wherein the two substrates of the first optical sensor and the second optical sensor are attached together in the shape of a bag having an opening along one side.

5. The detection device according to claim 1, wherein the substrates of the first optical sensor and the second optical sensor are a common, integrated flexible substrate that is deformable into a ring shape.

6. The detection device according to claim 1, wherein the plurality of sensor pixels of each of the first optical sensor and the second optical sensor include a first light-emitting element that emits near-infrared light, a second light-emitting element that emits red light, and a third light-emitting element that emits green light.

7. The detection device according to claim 6, wherein in the plurality of sensor pixels of each of the first optical sensor and the second optical sensor, the first light-emitting element, the second light-emitting element, the third light-emitting element and the photodetector element are arranged in a grid pattern.

8. The detection device according to claim 6, wherein in the plurality of sensor pixels of each of the first optical sensor and the second optical sensor, the first light-emitting element, the second light-emitting element, and the third light-emitting element are arranged surrounding the photodetection element, and are arranged in the following order from the photodetection element: the third light-emitting element emitting green light, the second light-emitting element emitting red light, and the first light-emitting element emitting near-infrared light.

9. The detection device according to claim 1, wherein an external connection terminal is provided on only one of the first optical sensor and the second optical sensor, and the plurality of light detection elements and the plurality of light sources arranged on the other of the first optical sensor and the second optical sensor that is not provided with the external connection terminal are electrically connected to the external connection terminal through wiring provided on the first optical sensor.

10. The detection device according to claim 1, wherein the plurality of sensor pixels are arranged in a matrix on the substrate, and further comprising: a plurality of sensor scanning lines provided on the substrate; a plurality of sensor signal lines intersecting with the plurality of sensor scanning lines; a first external connection terminal provided in an area along one side of the substrate; a sensor scanning circuit provided in an area along an edge intersecting with the one side of the substrate and connected to the plurality of sensor scanning lines; a plurality of light source scanning lines provided on the substrate; a plurality of light source signal lines intersecting with the plurality of light source scanning lines; and a light source scanning circuit provided in an area along the edge intersecting with the one side of the substrate and connected to the plurality of light source scanning lines.

11. The detection device according to claim 1, wherein the plurality of light sources are turned on when a predetermined finger is not present, the detection device has sensor correction data based on sensor output data acquired from the plurality of light detection elements, and the detection device corrects the sensor output data based on the sensor correction data when measuring the predetermined finger.

Images