Detection device

Abstract

To provide a detection unit capable of detecting various kinds of biological information with a single sensor.SOLUTION: A detection unit comprises a sensor substrate, a plurality of photoelectric transducers, a plurality of switching elements, a plurality of gate lines, a plurality of signal lines, a selecting circuit for selecting at least one of the plurality of signal lines, a detection circuit connected to the selecting circuit, and a light source. The plurality of gate lines is connected to the switching elements arranged in individual rows of the plurality of switching elements. The plurality of signal lines is connected to the switching elements arranged in individual rows of the plurality of switching elements. The detection unit includes a plurality of reset periods to sequentially supply a predetermined rest voltage to the plurality of photoelectric transducers in each row, and a plurality of read periods when the detection circuit reads detection signals from the plurality of photoelectric transducers in each row.SELECTED DRAWING: Figure 4

Description

Technical Field

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

Background Art

[0002] Patent Document 1 describes an optical sensor in which a plurality of photoelectric conversion elements such as photodiodes are arranged on a semiconductor substrate. The optical sensor can detect biological information by changing a signal output from the photoelectric conversion element according to the amount of irradiated light. The optical sensor of Patent Document 1 can detect unevenness on the surface of a finger at a fine pitch and is used as a fingerprint sensor. Patent Document 2 describes a display device including a plurality of sensors that sense infrared rays. The display device of Patent Document 2 can detect the position of a finger, a fingerprint pattern, and a vein pattern based on the reflected light of infrared light.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] Optical sensors are required to detect various biological information of a detection object, not limited to the shape of a fingerprint of a detection object such as a finger or a palm. In Patent Documents 1 and 2, it may be difficult to detect a plurality of different biological information with the same sensor.

[0005] An object of the present invention is to provide a detection device capable of detecting various biological information with the same sensor.

Means for Solving the Problems

[0006] The detection device according to one aspect of the present invention includes a sensor substrate, a plurality of photoelectric conversion elements provided in a detection region of the sensor substrate and outputting signals corresponding to the light irradiated thereon, a plurality of switching elements provided for each of the plurality of photoelectric conversion elements, a plurality of gate lines connected to each of the plurality of switching elements and extending in a first direction, a first light source emitting a first light having a first emission peak wavelength, and a second light source emitting a second light having a second emission peak wavelength.

Brief Description of Drawings

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[0008] Embodiments (embodiments) of the invention will be described in detail with reference to the drawings. The present invention is not limited by the content described in the following embodiments. Further, the constituent elements described below include those that can be easily assumed by those skilled in the art and substantially the same ones. Furthermore, the constituent elements described below can be combined as appropriate. Note that the disclosure is merely an example, and those that can be easily conceived by those skilled in the art with appropriate modifications while maintaining the gist of the invention are naturally included in the scope of the present invention. Also, for the purpose of making the description clearer, the drawings may schematically represent the width, thickness, shape, etc. of each part compared to the actual aspect, but this is merely an example and does not limit the interpretation of the present invention. Also, in this specification and each drawing, elements that are the same as those described above with respect to the already shown drawings may be given the same reference numerals, and detailed descriptions may be omitted as appropriate.

[0009] (First Embodiment) FIG. 1 is a plan view showing a detection device according to the first embodiment. As shown in FIG. 1, the detection device 1 includes a sensor substrate 21, a sensor unit 10, a gate line driving circuit 15, a signal line selection circuit 16, a detection circuit 48, a control circuit 122, a power supply circuit 123, a first light source substrate 51, a second light source substrate 52, a first light source 61, and a second light source 62.

[0010] A control board 121 is electrically connected to the sensor substrate 21 via a flexible printed circuit board 71. A detection circuit 48 is provided on the flexible printed circuit board 71. A control circuit 122 and a power supply circuit 123 are provided on the control board 121. The control circuit 122 is, for example, an FPGA (Field Programmable Gate Array). The control circuit 122 supplies control signals to the sensor unit 10, the gate line driving circuit 15, and the signal line selection circuit 16 to control the detection operation of the sensor unit 10. Further, the control circuit 122 supplies control signals to the first light source 61 and the second light source 62 to control the lighting or non-lighting of the first light source 61 and the second light source 62. The power supply circuit 123 supplies voltage signals such as a sensor power supply signal VDDSNS (see FIG. 4) to the sensor unit 10, the gate line driving circuit 15, and the signal line selection circuit 16. Further, the power supply circuit 123 supplies a power supply voltage to the first light source 61 and the second light source 62.

[0011] The sensor substrate 21 has a detection region AA and a peripheral region GA. The detection region AA is a region where a plurality of photodiodes PD (see FIG. 4) included in the sensor unit 10 are provided. The peripheral region GA is a region between the outer periphery of the detection region AA and the end of the sensor substrate 21, and is a region that does not overlap with the photodiode PD.

[0012] The gate line driving circuit 15 and the signal line selection circuit 16 are provided in the peripheral region GA. Specifically, the gate line driving circuit 15 is provided in a region extending along the second direction Dy in the peripheral region GA. The signal line selection circuit 16 is provided in a region extending along the first direction Dx in the peripheral region GA, and is provided between the sensor unit 10 and the detection circuit 48.

[0013] The first direction Dx is a direction in a plane parallel to the sensor substrate 21. The second direction Dy is a direction in a plane parallel to the sensor substrate 21 and is a direction orthogonal to the first direction Dx. Note that the second direction Dy may intersect without being orthogonal to the first direction Dx. Further, the third direction Dz is a direction orthogonal to the first direction Dx and the second direction Dy, and is the normal direction of the sensor substrate 21.

[0014] The plurality of first light sources 61 are provided on the first light source base material 51 and arranged along the second direction Dy. The plurality of second light sources 62 are provided on the second light source base material 52 and arranged along the second direction Dy. The first light source base material 51 and the second light source base material 52 are electrically connected to the control circuit 122 and the power supply circuit 123 via the terminal portions 124 and 125 provided on the control substrate 121, respectively.

[0015] For the plurality of first light sources 61 and the plurality of second light sources 62, for example, inorganic LEDs (Light Emitting Diodes), organic ELs (OLEDs: Organic Light Emitting Diodes), etc. are used. The plurality of first light sources 61 and the plurality of second light sources 62 emit first light L61 and second light L62 (see FIG. 9) having different wavelengths, respectively. That is, the first light L61 has a first emission peak wavelength MW1, and the second light L62 has a second emission peak wavelength different from the first emission peak wavelength MW1. The emission peak wavelength is the wavelength showing the maximum emission intensity in the emission spectrum showing the relationship between the wavelengths and emission intensities of the first light L61 and the second light L62, respectively.

[0016] FIG. 26 is a graph showing an example of the emission spectra of the first light and the second light. In the graph 1 shown in FIG. 26, the horizontal axis represents the wavelength and the vertical axis represents the emission intensity. As shown in FIG. 26, as an example, the first light L61 has a first emission peak wavelength MW1 of 520 nm or more and 600 nm or less, for example, about 560 nm, and the second light L62 has a second emission peak wavelength MW2 of 600 nm or more and 700 nm or less, for example, about 660 nm. That is, the second emission peak wavelength MW2 of the second light L62 is longer than the first emission peak wavelength MW1 of the first light L61. In this case, the first light L61 and the second light L62 are visible light. The first light L61 is blue or green light, and the second light L62 is red light.

[0017] The first light L61 emitted from the first light source 61 is reflected by the surface of a detection object such as a finger Fg and enters the sensor unit 10. Thereby, the sensor unit 10 can detect a fingerprint by detecting the uneven shape of the surface of the finger Fg or the like. The second light L62 emitted from the second light source 62 is reflected inside the finger Fg or the like or transmitted through the finger Fg or the like and enters the sensor unit 10. Thereby, the sensor unit 10 can detect information regarding the living body inside the finger Fg or the like. Information regarding the living body is, for example, the pulse of the finger Fg or the palm, and the like.

[0018] The wavelengths of the first light L61 and the second light L62 are not limited to the above-described examples and can be appropriately changed. FIG. 27 is a graph showing another example of the emission spectra of the first light and the second light. As shown in graph 2 of FIG. 27, for example, the first light L61 may have a first emission peak wavelength MW1 of 520 nm or more and 600 nm or less, for example, about 560 nm, and the second light L62 may have a second emission peak wavelength MW2 of 780 nm or more and 900 nm or less, for example, about 850 nm. In this case, the first light L61 is blue or green visible light, and the second light L62 is infrared light. The sensor unit 10 can detect a fingerprint based on the first light L61 emitted from the first light source 61. The second light L62 emitted from the second light source 62 is reflected inside the detection object such as the finger Fg or transmitted through the finger Fg or the like and enters the sensor unit 10. Thereby, the sensor unit 10 can detect a blood vessel image (venous pattern) as information regarding the living body inside the finger Fg or the like.

[0019] Alternatively, the first light L61 may have a first emission peak wavelength MW1 of 600 nm or more and 700 nm or less, for example, about 660 nm, and the second light L62 may have a second emission peak wavelength MW2 of 780 nm or more and 900 nm or less, for example, about 850 nm. In this case, based on the first light L61 emitted from the first light source 61 and the second light L62 emitted from the second light source 62, the sensor unit 10 can detect, as information regarding the living body, in addition to the pulse and the blood vessel image, the blood oxygen concentration. Thus, since the detection device 1 includes the first light source 61 and the plurality of second light sources 62, by performing detection based on the first light L61 and detection based on the second light L62, various information regarding the living body can be detected.

[0020] Note that the arrangements of the first light source 61 and the second light source 62 shown in FIG. 1 are merely examples and can be changed as appropriate. For example, a plurality of first light sources 61 and a plurality of second light sources 62 may be arranged on each of the first light source base material 51 and the second light source base material 52. In this case, a group including the plurality of first light sources 61 and a group including the plurality of second light sources 62 may be arranged side by side in the second direction Dy, or the first light source 61 and the second light source 62 may be alternately arranged in the second direction Dy. Further, the number of light source base materials on which the first light source 61 and the second light source 62 are provided may be one or three or more.

[0021] FIG. 2 is a block diagram showing a configuration example of the detection device according to the first embodiment. As shown in FIG. 2, the detection device 1 further includes a detection control unit 11 and a detection unit 40. Part or all of the functions of the detection control unit 11 are included in the control circuit 122. Also, part or all of the functions other than the detection circuit 48 in the detection unit 40 are included in the control circuit 122.

[0022] The sensor unit 10 is an optical sensor having a photodiode PD which is a photoelectric conversion element. The photodiode PD included in the sensor unit 10 outputs an electric signal corresponding to the irradiated light as a detection signal Vdet to the signal line selection circuit 16. Also, the sensor unit 10 performs detection in accordance with the gate drive signal Vgcl supplied from the gate line drive circuit 15.

[0023] The detection control unit 11 is a circuit that supplies control signals to the gate line drive circuit 15, the signal line selection circuit 16, and the detection unit 40 respectively, and controls these operations. The detection control unit 11 supplies various control signals such as a start signal STV, a clock signal CK, and a reset signal RST1 to the gate line drive circuit 15. Also, the detection control unit 11 supplies various control signals such as a selection signal ASW to the signal line selection circuit 16. Further, the detection control unit 11 supplies various control signals to the first light source 61 and the second light source 62 to control their lighting and non-lighting respectively.

[0024] The gate line driving circuit 15 is a circuit that drives a plurality of gate lines GCL (see FIG. 3) based on various control signals. The gate line driving circuit 15 sequentially or simultaneously selects a plurality of gate lines GCL and supplies a gate driving signal Vgcl to the selected gate line GCL. Thereby, the gate line driving circuit 15 selects a plurality of photodiodes PD connected to the gate line GCL.

[0025] The signal line selection circuit 16 is a switch circuit that sequentially or simultaneously selects a plurality of signal lines SGL (see FIG. 3). The signal line selection circuit 16 is, for example, a multiplexer. The signal line selection circuit 16 connects the selected signal line SGL and the detection circuit 48 based on a selection signal ASW supplied from the detection control unit 11. Thereby, the signal line selection circuit 16 outputs the detection signal Vdet of the photodiode PD to the detection unit 40.

[0026] The detection unit 40 includes a detection circuit 48, a signal processing unit 44, a coordinate extraction unit 45, a storage unit 46, a detection timing control unit 47, and an image processing unit 49. The detection timing control unit 47 controls the detection circuit 48, the signal processing unit 44, the coordinate extraction unit 45, and the image processing unit 49 to operate synchronously based on a control signal supplied from the detection control unit 11.

[0027] The detection circuit 48 is, for example, an analog front end circuit (AFE, Analog Front End). The detection circuit 48 is a signal processing circuit having at least the functions of a detection signal amplification unit 42 and an A / D conversion unit 43. The detection signal amplification unit 42 amplifies the detection signal Vdet. The A / D conversion unit 43 converts the analog signal output from the detection signal amplification unit 42 into a digital signal.

[0028] The signal processing unit 44 is a logic circuit that detects a predetermined physical quantity input to the sensor unit 10 based on the output signal of the detection circuit 48. When the finger Fg contacts or approaches the detection surface, the signal processing unit 44 can detect the unevenness of the surface of the finger Fg and the palm based on the signal from the detection circuit 48. Further, the signal processing unit 44 can detect information related to the living body based on the signal from the detection circuit 48. Information related to the living body is, for example, the blood vessel image, pulse wave, pulse, blood oxygen concentration, etc. of the finger Fg and the palm.

[0029] Further, the signal processing unit 44 may acquire the detection signals Vdet (information related to the living body) simultaneously detected by the plurality of photodiodes PD and execute a process of averaging them. In this case, the detection unit 40 can suppress noise and measurement errors caused by relative positional displacement between the detection object such as the finger Fg and the sensor unit 10, enabling stable detection.

[0030] The storage unit 46 temporarily stores the signal calculated by the signal processing unit 44. The storage unit 46 may be, for example, a RAM (Random Access Memory), a register circuit, or the like.

[0031] The coordinate extraction unit 45 is a logic circuit that obtains the detection coordinates of the unevenness on the surface of the finger or the like when the contact or proximity of the finger is detected in the signal processing unit 44. Further, the coordinate extraction unit 45 is a logic circuit that obtains the detection coordinates of the blood vessels of the finger Fg and the palm. The image processing unit 49 combines the detection signals Vdet output from each photodiode PD of the sensor unit 10 to generate two-dimensional information indicating the shape of the unevenness on the surface of the finger Fg or the like and two-dimensional information indicating the shape of the blood vessels of the finger Fg and the palm. Note that the coordinate extraction unit 45 may output the detection signal Vdet as the sensor output Vo without calculating the detection coordinates. Further, the coordinate extraction unit 45 and the image processing unit 49 may not be included in the detection unit 40.

[0032] Next, a circuit configuration example of the detection device 1 will be described. FIG. 3 is a circuit diagram showing the detection device. FIG. 4 is a circuit diagram showing a plurality of partial detection regions. Note that FIG. 4 also shows the circuit configuration of the detection circuit 48.

[0033] As shown in FIG. 3, the sensor unit 10 has a plurality of partial detection regions PAA arranged in a matrix. Each of the plurality of partial detection regions PAA is provided with a photodiode PD.

[0034] The gate lines GCL extend in the first direction Dx and are connected to a plurality of partial detection regions PAA arranged in the first direction Dx. Further, a plurality of gate lines GCL(1), GCL(2),..., GCL(8) are arranged in the second direction Dy and are respectively connected to the gate line drive circuit 15. In the following description, when it is not necessary to distinguish and describe the plurality of gate lines GCL(1), GCL(2),..., GCL(8), they are simply represented as gate lines GCL. Also, in FIG. 3, for the sake of easy understanding, eight gate lines GCL are shown, but this is merely an example, and the gate lines GCL may be arranged in M (M is 8 or more, for example, M = 256) numbers.

[0035] The signal lines SGL extend in the second direction Dy and are connected to the photodiodes PD of a plurality of partial detection regions PAA arranged in the second direction Dy. Further, a plurality of signal lines SGL(1), SGL(2),..., SGL(12) are arranged in the first direction Dx and are respectively connected to the signal line selection circuit 16 and the reset circuit 17. In the following description, when it is not necessary to distinguish and describe the plurality of signal lines SGL(1), SGL(2),..., SGL(12), they are simply represented as signal lines SGL.

[0036] Also, for the sake of easy understanding, twelve signal lines SGL are shown, but this is merely an example, and the signal lines SGL may be arranged in N (N is 12 or more, for example, N = 252) numbers. Also, in FIG. 3, the sensor unit 10 is provided between the signal line selection circuit 16 and the reset circuit 17. However, it is not limited to this, and the signal line selection circuit 16 and the reset circuit 17 may be respectively connected to the ends of the signal lines SGL in the same direction. Also, the substantial area of one sensor is, for example, substantially 50×50um 2The resolution of the detection area AA is, for example, substantially 508 ppi, the number of sensors arranged in the detection area AA is, for example, 252 cells × 256 cells, and the area of the detection area AA is, for example, 12.6 × 12.8 mm 2 It is set as such.

[0037] The gate line driving circuit 15 receives various control signals such as a start signal STV, a clock signal CK, and a reset signal RST1 from a control circuit 122 (see FIG. 2). Based on the various control signals, the gate line driving circuit 15 sequentially selects a plurality of gate lines GCL(1), GCL(2),..., GCL(8) in a time-division manner. The gate line driving circuit 15 supplies a gate driving signal Vgcl to the selected gate line GCL. As a result, the gate driving signal Vgcl is supplied to a plurality of first switching elements Tr connected to the gate line GCL, and a plurality of partial detection areas PAA arranged in the first direction Dx are selected as detection targets.

[0038] Note that the gate line driving circuit 15 may perform different driving for each detection mode of fingerprint detection and information regarding a plurality of different living bodies (pulse wave, pulse, blood vessel image, blood oxygen concentration, etc.). For example, the gate line driving circuit 15 may drive a plurality of gate lines GCL bundled together.

[0039] Specifically, based on the control signal, the gate line driving circuit 15 simultaneously selects a predetermined number of gate lines GCL among the gate lines GCL(1), GCL(2),..., GCL(8). For example, the gate line driving circuit 15 simultaneously selects six gate lines GCL(1) to GCL(6) and supplies the gate driving signal Vgcl. The gate line driving circuit 15 supplies the gate driving signal Vgcl to a plurality of first switching elements Tr via the selected six gate lines GCL. As a result, detection area groups PAG1 and PAG2 including a plurality of partial detection areas PAA arranged in the first direction Dx and the second direction Dy are each selected as detection targets. The gate line driving circuit 15 drives a predetermined number of gate lines GCL bundled together and sequentially supplies the gate driving signal Vgcl for each predetermined number of gate lines GCL.

[0040] The signal line selection circuit 16 includes a plurality of selection signal lines Lsel, a plurality of output signal lines Lout, and a third switching element TrS. The plurality of third switching elements TrS are provided corresponding to the plurality of signal lines SGL respectively. The six signal lines SGL(1), SGL(2), …, SGL(6) are connected to a common output signal line Lout1. The six signal lines SGL(7), SGL(8), …, SGL(12) are connected to a common output signal line Lout2. The output signal lines Lout1 and Lout2 are respectively connected to the detection circuit 48.

[0041] Here, the signal lines SGL(1), SGL(2), …, SGL(6) are defined as the first signal line block, and the signal lines SGL(7), SGL(8), …, SGL(12) are defined as the second signal line block. The plurality of selection signal lines Lsel are respectively connected to the gates of the third switching elements TrS included in one signal line block. Also, one selection signal line Lsel is connected to the gates of the third switching elements TrS of the plurality of signal line blocks.

[0042] Specifically, the selection signal lines Lsel1, Lsel2, …, Lsel6 are respectively connected to the third switching elements TrS corresponding to the signal lines SGL(1), SGL(2), …, SGL(6). Also, the selection signal line Lsel1 is connected to the third switching element TrS corresponding to the signal line SGL(1) and the third switching element TrS corresponding to the signal line SGL(7). The selection signal line Lsel2 is connected to the third switching element TrS corresponding to the signal line SGL(2) and the third switching element TrS corresponding to the signal line SGL(8).

[0043] The control circuit 122 (see FIG. 1) sequentially supplies the selection signal ASW to the selection signal line Lsel. Thereby, the signal line selection circuit 16 sequentially selects the signal lines SGL in a time-division manner in one signal line block by the operation of the third switching element TrS. Also, the signal line selection circuit 16 selects one signal line SGL from each of the plurality of signal line blocks. With such a configuration, the detection device 1 can reduce the number of ICs (Integrated Circuits) including the detection circuit 48 or the number of terminals of the IC.

[0044] Note that the signal line selection circuit 16 may bundle a plurality of signal lines SGL and connect them to the detection circuit 48. Specifically, the control circuit 122 (see FIG. 1) simultaneously supplies the selection signal ASW to the selection signal line Lsel. Thereby, the signal line selection circuit 16 selects a plurality of signal lines SGL (for example, six signal lines SGL) in one signal line block by the operation of the third switching element TrS, and connects the plurality of signal lines SGL and the detection circuit 48. Thereby, the signals detected in the detection region groups PAG1 and PAG2 are output to the detection circuit 48. In this case, the signals from the plurality of partial detection regions PAA (photodiodes PD) included in the detection region groups PAG1 and PAG2 are integrated and output to the detection circuit 48.

[0045] By performing detection for each of the detection region groups PAG1 and PAG2 by the operations of the gate line drive circuit 15 and the signal line selection circuit 16, the intensity of the detection signal Vdet obtained by one detection is improved, so that the sensor sensitivity can be improved. Also, the time required for detection can be shortened. For this reason, the detection device 1 can repeatedly execute detection in a short time, so that the S / N ratio can be improved, and the temporal change of information about a living body such as a pulse wave can be accurately detected.

[0046] As shown in FIG. 3, the reset circuit 17 has a reference signal line Lvr, a reset signal line Lrst, and a fourth switching element TrR. The fourth switching element TrR is provided corresponding to a plurality of signal lines SGL. The reference signal line Lvr is connected to one of the sources or drains of the plurality of fourth switching elements TrR. The reset signal line Lrst is connected to the gates of the plurality of fourth switching elements TrR.

[0047] The control circuit 122 supplies a reset signal RST2 to the reset signal line Lrst. Thereby, the plurality of fourth switching elements TrR are turned on, and the plurality of signal lines SGL are electrically connected to the reference signal line Lvr. The power supply circuit 123 supplies a reference signal COM to the reference signal line Lvr. Thereby, the reference signal COM is supplied to the capacitor elements Ca (see FIG. 4) included in the plurality of partial detection regions PAA.

[0048] As shown in FIG. 4, the partial detection region PAA includes a photodiode PD, a capacitor element Ca, and a first switching element Tr. In FIG. 4, among the plurality of gate lines GCL, two gate lines GCL(m) and GCL(m + 1) arranged in the second direction Dy are shown. Also, among the plurality of signal lines SGL, two signal lines SGL(n) and SGL(n + 1) arranged in the first direction Dx are shown. The partial detection region PAA is an area surrounded by the gate line GCL and the signal line SGL. The first switching element Tr is provided corresponding to the photodiode PD. The first switching element Tr is composed of a thin film transistor, and in this example, it is composed of an n-channel MOS (Metal Oxide Semiconductor) type TFT (Thin Film Transistor).

[0049] The gates of the first switching elements Tr belonging to the plurality of partial detection regions PAA arranged in the first direction Dx are connected to the gate line GCL. The sources of the first switching elements Tr belonging to the plurality of partial detection regions PAA arranged in the second direction Dy are connected to the signal line SGL. The drain of the first switching element Tr is connected to the cathode of the photodiode PD and the capacitor element Ca.

[0050] The anode of the photodiode PD is supplied with a sensor power signal VDDSNS from the power supply circuit 123. Also, a reference signal COM serving as the initial potential of the signal line SGL and the capacitor element Ca is supplied from the power supply circuit 123 to the signal line SGL and the capacitor element Ca.

[0051] When the partial detection area PAA is irradiated with light, a current corresponding to the amount of light flows through the photodiode PD, and thereby charges are accumulated in the capacitor element Ca. When the first switching element Tr is turned on, a current flows through the signal line SGL according to the charges accumulated in the capacitor element Ca. The signal line SGL is connected to the detection circuit 48 via the third switching element TrS of the signal line selection circuit 16. Thereby, the detection device 1 can detect a signal corresponding to the amount of light irradiated to the photodiode PD for each partial detection area PAA or for each detection area group PAG1, PAG2.

[0052] During the read period Pdet (see FIG. 7), the switch SSW is turned on and connected to the signal line SGL. The detection signal amplification unit 42 of the detection circuit 48 converts the variation in the current supplied from the signal line SGL into a variation in voltage and amplifies it. A reference voltage Vref having a fixed potential is input to the non-inverting input part (+) of the detection signal amplification unit 42, and the signal line SGL is connected to the inverting input terminal (-). In the present embodiment, the same signal as the reference signal COM is input as the reference voltage Vref. Also, the detection signal amplification unit 42 has a capacitor element Cb and a reset switch RSW. During the reset period Prst (see FIG. 7), the reset switch RSW is turned on and the charges in the capacitor element Cb are reset.

[0053] Next, the configuration of the photodiode PD will be described. FIG. 5 is a cross-sectional view showing a schematic cross-sectional configuration of the sensor unit.

[0054] As shown in FIG. 5, the sensor unit 10 includes a sensor substrate 21, a TFT layer 22, an insulating layer 23, a photodiode PD, and a protective film 24. The sensor substrate 21 is an insulating substrate, and for example, glass or a resin material is used. The sensor substrate 21 is not limited to a flat plate shape and may have a curved surface. In this case, the sensor substrate 21 may be a film-shaped resin. The sensor substrate 21 has a first surface S1 and a second surface S2 on the opposite side of the first surface S1. On the first surface S1, the TFT layer 22, the insulating layer 23, the photodiode PD, and the protective film 24 are laminated in this order.

[0055] The TFT layer 22 is provided with circuits such as the gate line drive circuit 15 and the signal line selection circuit 16 described above. Also, the TFT layer 22 is provided with TFTs (Thin Film Transistors) such as the first switching element Tr and various wirings such as the gate line GCL and the signal line SGL. The sensor substrate 21 and the TFT layer 22 are a drive circuit board that drives the sensor for each predetermined detection region, and are also called a backplane.

[0056] The insulating layer 23 is an inorganic insulating layer. As the insulating layer 23, for example, oxides such as silicon oxide (SiO2) and nitrides such as silicon nitride (SiN) are used.

[0057] The photodiode PD is provided on the insulating layer 23. The photodiode PD has a photoelectric conversion layer 31, a cathode electrode 35, and an anode electrode 34. In the direction perpendicular to the first surface S1 of the sensor substrate 21, the cathode electrode 35, the photoelectric conversion layer 31, and the anode electrode 34 are laminated in this order. Note that the lamination order of the photodiode PD may be the anode electrode 34, the photoelectric conversion layer 31, and the cathode electrode 35.

[0058] The characteristics (for example, voltage-current characteristics and resistance value) of the photoelectric conversion layer 31 change according to the irradiated light. An organic material is used as the material of the photoelectric conversion layer 31. Specifically, as the photoelectric conversion layer 31, for example, a low-molecular organic material C 60(Fullerene), PCBM (Phenyl C61-butyric acid methyl ester), CuPc (Copper phthalocyanine), F 16 CuPc (fluorinated copper phthalocyanine), rubrene (5,6,11,12-tetraphenyltetracene), PDI (a derivative of Perylene), etc. can be used.

[0059] The photoelectric conversion layer 31 can be formed by a vapor deposition type (Dry Process) using these low-molecular organic materials. In this case, the photoelectric conversion layer 31 is, for example, a laminated film of CuPc and F 16 a laminated film of CuPc, or a laminated film of rubrene and C 60 It may also be a laminated film with. The photoelectric conversion layer 31 can also be formed by a coating type (Wet Process). In this case, a material combining the above-mentioned low-molecular organic material and high-molecular organic material is used as the photoelectric conversion layer 31. As the high-molecular organic material, for example, P3HT (poly(3-hexylthiophene)), F8BT (F8-alt-benzothiadiazole), etc. can be used. The photoelectric conversion layer 31 can be a film in a state where P3HT and PCBM are mixed, or a film in a state where F8BT and PDI are mixed.

[0060] The cathode electrode 35 and the anode electrode 34 face each other with the photoelectric conversion layer 31 interposed therebetween. As the anode electrode 34, for example, a conductive material having translucency such as ITO (Indium Tin Oxide) is used. As the cathode electrode 35, for example, a metal material such as silver (Ag) or aluminum (Al) is used. Or, the cathode electrode 35 may be an alloy material containing at least one or more of these metal materials.

[0061] By controlling the film thickness of the cathode electrode 35, the cathode electrode 35 can be formed as a semi-transmissive electrode having translucency. For example, the cathode electrode 35 is formed of an Ag thin film with a film thickness of 10 nm and has a translucency of about 60%. In this case, the photodiode PD can detect both the light irradiated from both sides of the sensor substrate 21, for example, the first light L61 irradiated from the first surface S1 side and the second light L62 irradiated from the second surface S2 side.

[0062] The protective film 24 is provided to cover the anode electrode 34. The protective film 24 is a passivation film and is provided to protect the photodiode PD.

[0063] FIG. 6 is a graph schematically showing the relationship between the wavelength of light incident on the photodiode and the conversion efficiency. The horizontal axis of the graph shown in FIG. 6 is the wavelength of light incident on the photodiode PD, and the vertical axis is the external quantum efficiency of the photodiode PD. The external quantum efficiency is represented by, for example, the ratio between the number of photons of light incident on the photodiode PD and the current flowing from the photodiode PD to the external detection circuit 48.

[0064] As shown in FIG. 6, the photodiode PD has good efficiency in a wavelength band of about 300 nm to 1000 nm. That is, the photodiode PD is sensitive to the wavelengths of both the first light L61 emitted from the first light source 61 and the second light L62 emitted from the second light source 62. Therefore, a single photodiode PD can detect a plurality of lights having different wavelengths.

[0065] Next, an operation example of the detection device 1 will be described. FIG. 7 is a timing waveform diagram showing an operation example of the detection device. FIG. 8 is a timing waveform diagram showing an operation example during the read period in FIG. 7.

[0066] As shown in Fig. 7, the detection device 1 has a reset period Prst, an exposure period Pex, and a readout period Pdet. The power supply circuit 123 supplies the sensor power signal VDDSNS to the anode of the photodiode PD over the reset period Prst, the exposure period Pex, and the readout period Pdet. The sensor power signal VDDSNS is a signal that applies a reverse bias between the anode and cathode of the photodiode PD. For example, a reference signal COM of substantially 0.75V is applied to the cathode of the photodiode PD, but by applying a sensor power signal VDDSNS of substantially -1.25V to the anode, a reverse bias of substantially 2.0V is applied between the anode and cathode. Also, when detecting light with a wavelength of 850nm, by applying a reverse bias of 2V, the photodiode PD can obtain a high sensitivity of 0.5A / W or more and 0.7A / W or less, preferably about 0.57A / W. Also, for the characteristics of the photodiode, when a reverse bias of 2V is applied, the dark current density is 1.0×10 -7 A / cm 2 and when detecting light with a wavelength of 850nm with an output of substantially 2.9mW / cm 2 the photocurrent density is 1.2×10 -3 A / cm 2 is used. Also, when irradiating light with a wavelength of 850nm and applying a reverse bias of 2V, the external quantum efficiency (EQE) becomes about 1.0. The control circuit 122 supplies a start signal STV and a clock signal CK to the gate line drive circuit 15 after setting the reset signal RST2 to "H", and the reset period Prst starts. During the reset period Prst, the control circuit 122 supplies the reference signal COM to the reset circuit 17 and turns on the fourth switching transistor TrR for supplying the reset voltage by the reset signal RST2. As a result, the reference signal COM is supplied as the reset voltage to each signal line SGL. The reference signal COM is set to 0.75V, for example.

[0067] During the reset period Prst, the gate line driving circuit 15 sequentially selects the gate lines GCL based on the start signal STV, the clock signal CK, and the reset signal RST1. The gate line driving circuit 15 sequentially supplies the gate driving signal Vgcl to the gate lines GCL. The gate driving signal Vgcl has a pulsed waveform having the power supply voltage VDD which is a high-level voltage and the power supply voltage VSS which is a low-level voltage. In FIG. 7, M (for example, M = 256) gate lines GCL are provided, and the gate driving signals Vgcl(1),..., Vgcl(M) are sequentially supplied to each gate line GCL.

[0068] As a result, during the reset period Prst, the capacitive elements Ca in all the partial detection regions PAA are sequentially electrically connected to the signal lines SGL, and the reference signal COM is supplied. As a result, the charges accumulated in the capacitance of the capacitive element Ca are reset.

[0069] After the gate driving signal Vgcl(M) is supplied to the gate line GCL, the exposure period Pex starts. Note that the actual exposure periods Pex(1),..., Pex(M) in the partial detection regions PAA corresponding to each gate line GCL have different start timings and end timings. The exposure periods Pex(1),..., Pex(M) each start at the timing when the gate driving signal Vgcl changes from the power supply voltage VDD which is a high-level voltage to the power supply voltage VSS which is a low-level voltage during the reset period Prst. Also, the exposure periods Pex(1),..., Pex(M) each end at the timing when the gate driving signal Vgcl changes from the power supply voltage VSS to the power supply voltage VDD during the readout period Pdet. The lengths of the exposure times of the exposure periods Pex(1),..., Pex(M) are equal.

[0070] During the exposure period Pex, in each partial detection region PAA, a current flows in response to the light irradiated on the photodiode PD. As a result, charges are accumulated in each capacitive element Ca.

[0071] Before the timing when the read period Pdet starts, the control circuit 122 sets the reset signal RST2 to a low-level voltage. As a result, the operation of the reset circuit 17 stops. During the read period Pdet, similar to the reset period Prst, the gate line driving circuit 15 sequentially supplies gate driving signals Vgcl(1),..., Vgcl(M) to the gate line GCL.

[0072] Specifically, as shown in FIG. 8, during the period t(1), the gate line driving circuit 15 supplies a gate driving signal Vgcl(1) with a high-level voltage (power supply voltage VDD) to the gate line GCL(1). The control circuit 122 sequentially supplies the selection signals ASW1,..., ASW6 to the signal line selection circuit 16 during the period when the gate driving signal Vgcl(1) is at a high-level voltage (power supply voltage VDD). As a result, the signal lines SGL of the partial detection region PAA selected by the gate driving signal Vgcl(1) are sequentially or simultaneously connected to the detection circuit 48. As a result, the detection signal Vdet is supplied to the detection circuit 48 for each partial detection region PAA. Incidentally, the time from when the gate driving signal Vgcl(1) becomes high level until the supply of the first selection signal ASW1 starts is, for example, about 20 us (substantially 20 us), and the time when each selection signal ASW1,..., ASW6 is supplied is, for example, about 60 us (substantially 60 us). Such high-speed responsiveness can be realized by using a thin film transistor (TFT) using low-temperature polycrystalline silicon (LTPS) with a mobility of substantially 40 cm 2 / Vs.

[0073] Similarly, during periods t(2), …, t(M-1), t(M), the gate line driving circuit 15 supplies gate driving signals Vgcl(2), …, Vgcl(M-1), Vgcl(M) of high level voltage to gate lines GCL(2), …, GCL(M-1), GCL(M), respectively. That is, the gate line driving circuit 15 supplies a gate driving signal Vgcl to the gate line GCL for each of the periods t(1), t(2), …, t(M-1), t(M). For each period during which each gate driving signal Vgcl is at a high level voltage, the signal line selection circuit 16 sequentially selects a signal line SGL based on a selection signal ASW. The signal line selection circuit 16 is sequentially connected to one detection circuit 48 for each signal line SGL. Thereby, during the read period Pdet, the detection device 1 can output detection signals Vdet of all partial detection regions PAA to the detection circuit 48.

[0074] Note that, in FIG. 8, an example in which the gate line driving circuit 15 selects one gate line GCL for each period t is shown, but the present invention is not limited to this. The gate line driving circuit 15 may simultaneously select two or more predetermined numbers of gate lines GCL and sequentially supply a gate driving signal Vgcl for each of the predetermined numbers of gate lines GCL. Also, the signal line selection circuit 16 may simultaneously connect two or more predetermined numbers of signal lines SGL to one detection circuit 48. Furthermore, the gate line driving circuit 15 may skip and scan a plurality of gate lines GCL. Also, as an example, the dynamic range is about 10 when the exposure time Pex is about 4.3 ms. 3 Also, a high resolution can be realized by setting the frame rate to about 4.4 fps (substantially 4.4 fps).

[0075] Next, a specific example and an operation example of the arrangement of the sensor unit 10, the first light source 61, and the second light source 62 will be described. FIG. 9 is a plan view schematically showing the relationship between the sensor unit, the first light source, and the second light source in the detection device according to the first embodiment. FIG. 10 is a side view schematically showing the relationship between the sensor unit, the first light source, and the second light source in the detection device according to the first embodiment. FIG. 11 is an explanatory diagram for explaining the relationship between the driving of the sensor unit of the detection device and the lighting operation of the light source.

[0076] As shown in FIG. 9, the sensor unit 10 has a first detection region R1 and a second detection region R2 adjacent to each other in the first direction Dx. Further, the detection device 1 has a first filter 63 and a second filter 64. The first filter 63 is disposed so as to overlap with the first detection region R1 and covers both end portions of the sensor unit 10 in the second direction Dy and one end portion in the first direction Dx. The first filter 63 has a first transmission band including at least the first emission peak wavelength MW1. That is, the first filter 63 has a transmission band that transmits the first light L61 emitted from the first light source 61 and does not transmit the second light L62 emitted from the second light source 62.

[0077] The second filter 64 is disposed so as to overlap with the second detection region R2 and covers both end portions of the sensor unit 10 in the second direction Dy and the other end portion in the first direction Dx. FIG. 28 is a graph showing an example of the transmission characteristics of the second filter. In the graph 3 shown in FIG. 28, the horizontal axis represents the wavelength and the vertical axis represents the light transmittance. As shown in FIG. 28, the second filter 64 has a second transmission band including at least the second emission peak wavelength MW2. That is, the second filter 64 has a transmission band that transmits the second light L62 emitted from the second light source 62 and does not transmit the first light L61 emitted from the first light source 61. The first filter 63 and the second filter 64 are each a band-pass filter. Note that the transmission characteristics of the second filter 64 may be appropriately changed in terms of the center wavelength and the half-value width according to the emission spectrum of the second light L62 and the second emission peak wavelength MW2. As shown in FIG. 28, for example, the center wavelength of the second transmission band of the second filter 64a is about 650 nm, and the center wavelength of the second transmission band of the second filter 64b is about 670 nm. Although not shown in FIG. 28, the transmission characteristics of the first filter 63 also have the same waveform as FIG. 28, and the center wavelength is near the first emission peak wavelength MW1.

[0078] The first filter 63 and the second filter 64 overlap from one end to the other end of the sensor unit 10 in the scanning direction SCAN, respectively, and are adjacent in the direction (first direction Dx) intersecting the scanning direction SCAN. The scanning direction SCAN is the direction in which the gate line driving circuit 15 scans the gate line GCL. That is, one gate line GCL is provided so as to straddle the first detection region R1 and the second detection region R2, and is connected to a plurality of partial detection regions PAA provided in the first detection region R1 and the second detection region R2. Also, one signal line SGL is provided in either the first detection region R1 or the second detection region R2, and is connected to a plurality of photodiodes PD in the first detection region R1 or a plurality of photodiodes PD in the second detection region R2.

[0079] The first light source substrate 51 and the second light source substrate 52 face each other in the second direction Dy with the sensor unit 10 interposed therebetween in a plan view. A plurality of first light sources 61 and a plurality of second light sources 62 are provided on the surface of the first light source substrate 51 facing the second light source substrate 52. Also, a plurality of first light sources 61 and a plurality of second light sources 62 are provided on the surface of the second light source substrate 52 facing the first light source substrate 51. Note that one first light source 61 and a plurality of second light sources 62 may be provided on each of the first light source substrate 51 and the second light source substrate 52.

[0080] The first light sources 61 and the second light sources 62 are arranged in the first direction Dx along the outer periphery of the detection region AA (the first detection region R1 and the second detection region R2). The first light source 61 is provided at a position corresponding to the first detection region R1, and emits the first light L61 in a direction parallel to the second direction Dy. Also, the plurality of first light sources 61 face each other in the second direction Dy with the first detection region R1 interposed therebetween.

[0081] The second light source 62 is provided at a position corresponding to the second detection region R2, and emits the second light L62 in a direction parallel to the second direction Dy. The plurality of second light sources 62 face each other in the second direction Dy with the second detection region R2 interposed therebetween.

[0082] In other words, the first detection region R1 is the region where the first filter 63 is provided and is a region capable of detecting the first light L61 from the first light source 61. The second detection region R2 is the region where the second filter 64 is provided and is a region capable of detecting the second light L62 from the second light source 62.

[0083] FIG. 10 is a side view when the detection device 1 is viewed from the first direction Dx. As shown in FIG. 10, a detection object such as a finger Fg contacts or approaches above the sensor unit 10 through at least one of the first filter 63 and the second filter 64 (the second filter 64 is not shown in FIG. 10). The first light source 61 and the second light source 62 (the second light source 62 is not shown in FIG. 10) are arranged above the sensor unit 10 and the first filter 63 and are arranged sandwiching the detection object such as the finger Fg in the second direction Dy.

[0084] The first light L61 emitted from the first light source 61 travels in a direction parallel to the second direction Dy and enters the finger Fg. The first light L61 is reflected on the surface or inside of the finger Fg. A part of the reflected light Ld reflected by the finger Fg travels in the third direction Dz, passes through the first filter 63, and enters the first detection region R1 of the sensor unit 10. Since the first light L61 and the reflected light Ld do not pass through the second filter 64, they do not enter the second detection region R2.

[0085] Although not shown in FIG. 10, similarly, the second light L62 emitted from the second light source is also reflected on the surface or inside of the finger Fg. A part of the reflected light Ld travels in the third direction Dz, passes through the second filter 64, and enters the second detection region R2 of the sensor unit 10. Since the second light L62 and the reflected light Ld do not pass through the first filter 63, they do not enter the first detection region R1. Thereby, it is possible to suppress the detection signal Vdet based on the first light L61 (hereinafter, may be referred to as the first detection signal) and the detection signal Vdet based on the second light L62 (hereinafter, may be referred to as the second detection signal) from overlapping.

[0086] As shown in FIG. 11, in each of periods t(1) to t(4), the detection device 1 executes the above-described reset period Prst, exposure period Pex, and readout period Pdet. In the reset period Prst and the readout period Pdet, the gate line driving circuit 15 sequentially scans from the gate line GCL(1) to the gate line GCL(M).

[0087] In period t(1), the second light source 62 is lit and the first light source 61 is not lit. Thereby, the detection device 1 performs detection in the second detection region R2 based on the second light L62 emitted from the second light source 62. That is, current flows from the photodiode PD belonging to the second detection region R2 to the detection circuit 48 via the signal line SGL. Also, in period t(2), the first light source 61 is lit and the second light source 62 is not lit. Thereby, the detection device 1 performs detection in the first detection region R1 based on the first light L61 emitted from the first light source 61. That is, current flows from the photodiode PD belonging to the first detection region R1 to the detection circuit 48 via the signal line SGL. Similarly, in period t(3), the second light source 62 is lit and the first light source 61 is not lit, and in period t(4), the first light source 61 is lit and the second light source 62 is not lit.

[0088] Thus, the first light source 61 and the second light source 62 are lit in a time-division manner for each period t. Thereby, the first detection signal detected by the photodiode PD based on the first light L61 and the second detection signal detected by the photodiode PD based on the second light L62 are output to the detection circuit 48 in a time-division manner. Therefore, it is possible to suppress the first detection signal and the second detection signal from being output to the detection circuit 48 in a superimposed manner. For this reason, the detection device 1 can detect information regarding various living bodies well.

[0089] Note that the driving methods of the first light source 61 and the second light source 62 can be changed as appropriate. For example, in FIG. 11, the first light source 61 and the second light source 62 are alternately lit for each period t, but the present invention is not limited to this. After the first light source 61 is continuously lit for a plurality of periods t, the second light source 62 may be continuously lit for a plurality of periods t.

[0090] (First Modification Example of the First Embodiment) FIG. 12 is an explanatory diagram for explaining the relationship between the driving of the sensor unit and the lighting operation of the light source according to the first modification example of the first embodiment. In the first modification example, the first light source 61 and the second light source 62 are lit simultaneously. Even in this case, since the first light L61 from the first light source 61 does not pass through the second filter 64, it does not enter the second detection region R2. Similarly, since the second light L62 from the second light source 62 does not pass through the first filter 63, it does not enter the first detection region R1. Therefore, it is possible to suppress the superposition of the first detection signal output from the first detection region R1 based on the first light L61 and the second detection signal output from the second detection region R2 based on the second light L62.

[0091] Further, the first light source 61 and the second light source 62 are lit during the exposure period Pex and are not lit during the reset period Prst and the readout period Pdet. Thereby, the detection device 1 can reduce the power consumption required for detection.

[0092] Note that the present invention is not limited to the example shown in FIG. 12, and the first light source 61 and the second light source 62 may be continuously lit over the entire periods of the reset period Prst, the exposure period Pex, and the readout period Pdet. Alternatively, either one of the first light source 61 and the second light source 62 may be lit during the exposure period Pex, and they may be lit alternately every period t.

[0093] (Second Modification Example of the First Embodiment) FIG. 13 is an explanatory diagram for explaining the relationship between the driving of the sensor unit according to the second modification of the first embodiment and the lighting operation of the light source. As shown in FIG. 13, in the second modification, the gate line driving circuit 15 supplies a gate driving signal Vgcl to some of the plurality of gate lines GCL. For example, the gate line driving circuit 15 sequentially supplies the gate driving signal Vgcl from the four gate lines GCL(m) to the gate line GCL(m + 3) during the reset period Prst and the read period Pdet. The gate lines GCL(1) to GCL(m - 1) and the gate lines GCL(m + 4) to GCL(M) are not selected as driving targets and no gate driving signal Vgcl is supplied.

[0094] Thereby, a first detection signal and a second detection signal are respectively output from a plurality of partial detection regions PAA connected from the gate line GCL(m) to the gate line GCL(m + 3). No detection signal is output from the partial detection region PAA connected to the non-selected gate line GCL.

[0095] In this embodiment, since only some of the gate lines GCL are scanned, the time required for detection can be shortened. Therefore, by performing detection quickly, temporal changes of a subject, such as a pulse, can be detected well. Also, the region overlapping with the finger Fg can be selected for detection, and the detection of the region overlapping with the finger Fg can be repeatedly executed. For this reason, the detection device 1 can increase the S / N ratio in detection.

[0096] Note that the selection of the gate lines GCL to be driven may be performed in any manner. For example, the gate line driving circuit 15 scans the gate lines GCL(1) to GCL(M) to perform overall detection of the detection region AA, and the detection unit 40 specifies the presence and position of the finger Fg. The control circuit 122 may select the gate lines GCL to be driven based on the position of the finger Fg. Alternatively, a capacitive touch panel may be provided, and the position of the finger Fg may be specified by the touch panel.

[0097] Also, in FIG. 13, only one of the first light source 61 and the second light source 62 is lit during the exposure period Pex, and the first light source 61 and the second light source 62 are lit alternately every period t. However, it is not limited to this, and the first light source 61 and the second light source 62 may be lit simultaneously, or the first light source 61 and the second light source 62 may be continuously lit throughout the entire periods of the reset period Prst, the exposure period Pex, and the readout period Pdet.

[0098] (Second Embodiment) FIG. 14 is a plan view schematically showing the relationship between the sensor unit and the first light source and the second light source of the detection device according to the second embodiment. FIG. 15 is a side view schematically showing the relationship between the sensor unit and the first light source and the second light source of the detection device according to the second embodiment. FIG. 16 is an explanatory diagram for explaining the relationship between the driving of the sensor unit and the lighting operation of the light source of the detection device according to the second embodiment. In the following description, the same reference numerals are given to the components described in the above-described embodiment, and the description thereof is omitted.

[0099] As shown in FIG. 14, the first detection region R1 and the second detection region R2 of the sensor unit 10 are arranged adjacent to each other in the second direction Dy. The first filter 63 is arranged to overlap the first detection region R1 and covers both ends in the first direction Dx of the sensor unit 10 and one end in the second direction Dy. The second filter 64 is arranged to overlap the second detection region R2 and covers both ends in the first direction Dx of the sensor unit 10 and the other end in the second direction Dy.

[0100] The first filter 63 and the second filter 64 overlap from one end to the other end of the sensor unit 10 in the first direction Dx, respectively, and are adjacent in the second direction Dy. That is, one gate line GCL is provided in either the first detection region R1 or the second detection region R2 and is connected to any one of a plurality of partial detection regions PAA of the first detection region R1 or a plurality of partial detection regions PAA of the second detection region R2. One signal line SGL is provided across the first detection region R1 and the second detection region R2 and is connected to a plurality of photodiodes PD in the first detection region R1 and a plurality of photodiodes PD in the second detection region R2.

[0101] The first light source substrate 51 and the second light source substrate 52 face each other in the first direction Dx with the sensor unit 10 interposed therebetween in a plan view. A plurality of first light sources 61 and a plurality of second light sources 62 are provided on the surface of the first light source substrate 51 that faces the second light source substrate 52. Also, a plurality of first light sources 61 and a plurality of second light sources 62 are provided on the surface of the second light source substrate 52 that faces the first light source substrate 51.

[0102] The first light sources 61 and the second light sources 62 are arranged in the second direction Dy along the outer periphery of the detection region AA (the first detection region R1 and the second detection region R2). The first light source 61 is provided at a position corresponding to the first detection region R1 and emits first light L61 in a direction parallel to the first direction Dx. Also, the plurality of first light sources 61 face each other in the first direction Dx with the first detection region R1 interposed therebetween.

[0103] The second light source 62 is provided at a position corresponding to the second detection region R2 and emits second light L62 in a direction parallel to the first direction Dx. The plurality of second light sources 62 face each other in the first direction Dx with the second detection region R2 interposed therebetween.

[0104] FIG. 15 is a side view when the detection device 1 is viewed from the first direction Dx. As shown in FIG. 15, a detection object such as a finger Fg is disposed above the sensor unit 10 via at least one of the first filter 63 and the second filter 64. The first light sources 61 and the second light sources 62 are disposed above the sensor unit 10, the first filter 63, and the second filter 64 and are disposed with a detection object such as a finger Fg interposed therebetween in the first direction Dx.

[0105] The first light L61 emitted from the first light source 61 and the second light L62 emitted from the second light source 62 each travel in a direction parallel to the first direction Dx and enter the finger Fg. The first light L61 and the second light L62 are reflected and scattered on the surface or inside of the finger Fg, and a part of the reflected light Ld travels in the third direction Dz. The reflected light Ld enters the sensor unit 10 through the first filter 63 or the second filter 64, respectively.

[0106] As described above, since one signal line SGL is provided across the first detection region R1 and the second detection region R2, in this embodiment, the first detection region R1 and the second detection region R2 are executed in a time-division manner. Specifically, as shown in FIG. 16, the gate line driving circuit 15 sequentially scans from the gate line GCL(1) to the gate line GCL(m) during the period t(1). The gate lines GCL(1) to GCL(m) are the gate lines GCL belonging to the second detection region R2 shown in FIG. 14. The gate line driving circuit 15 scans the gate line GCL according to the second scanning direction SCAN2 shown in FIG. 14.

[0107] On the other hand, during the period t(1), no gate drive signal Vgcl is supplied to the gate lines GCL (from the gate line GCL(m + 1) to the gate line GCL(M)) belonging to the first detection region R1. Therefore, each photodiode PD in the first detection region R1 is in a non-connected state with the signal line SGL.

[0108] Thereby, the detection device 1 performs detection in the second detection region R2 based on the second light L62 emitted from the second light source 62 during the period t(1). That is, current flows from the plurality of photodiodes PD belonging to the second detection region R2 to the detection circuit 48 via the signal line SGL. Although both the first light source 61 and the second light source 62 are lit during the period t(1), the first light L61 from the first light source 61 does not pass through the second filter 64 and thus does not enter the second detection region R2. Therefore, the detection device 1 can perform detection based on the second light L62 well.

[0109] Next, during the period t(2), the gate line driving circuit 15 sequentially supplies the gate drive signal Vgcl from the gate line GCL(M) to the gate line GCL(m + 1). The gate lines GCL(M) to GCL(m + 1) are the gate lines GCL belonging to the first detection region R1 shown in FIG. 14. The gate line driving circuit 15 scans the gate line GCL according to the first scanning direction SCAN1 shown in FIG. 14. The first scanning direction SCAN1 is opposite to the second scanning direction SCAN2.

[0110] On the other hand, during period t(2), the gate drive signal Vgcl is not supplied to the gate lines GCL (gate lines GCL(1) to GCL(m)) belonging to the second detection region R2. Therefore, each photodiode PD in the second detection region R2 is in a non-connected state with the signal line SGL.

[0111] As a result, during period t(2), the detection device 1 performs detection in the first detection region R1 based on the first light L61 emitted from the first light source 61. That is, current flows from the plurality of photodiodes PD belonging to the first detection region R1 to the detection circuit 48 via the signal line SGL.

[0112] During periods t(3) and t(4), the same operations as in periods t(1) and t(2) are repeatedly executed respectively. In this way, the gate line drive circuit 15 sequentially supplies the gate drive signal Vgcl to the gate lines GCL (gate lines GCL(m + 1) to GCL(M)) provided in the first detection region R1 among the plurality of gate lines GCL in the first scanning direction SCAN1. Further, the gate line drive circuit 15 supplies the gate drive signal Vgcl sequentially to the gate lines GCL (gate lines GCL(M) to GCL(m + 1)) provided in the second detection region R2 in the second scanning direction SCAN2 opposite to the first scanning direction SCAN1 during a period different from the detection period of the first detection region R1.

[0113] As a result, even when one signal line SGL is provided across the first detection region R1 and the second detection region R2, it is possible to suppress the superposition of the first detection signal from the first detection region R1 based on the first light L61 and the second detection signal from the second detection region R2 based on the second light L62.

[0114] In FIG. 16, the first light source 61 and the second light source 62 are continuously lit over the reset period Prst, the exposure period Pex, and the readout period Pdet, but it is not limited thereto. Also in the second embodiment, the operations of the first light source 61 and the second light source 62 shown in the above-described first embodiment, first modification example, and second modification example can be applied.

[0115] That is, the second light source 62 may be turned on during the period t(1), the first light source 61 may be in the non-lighting state, the first light source 61 may be turned on during the period t(2), and the second light source 62 may be in the non-lighting state. Thus, the first light source 61 and the second light source 62 may be alternately turned on. Or, the first light source 61 and the second light source 62 may be turned on only during the exposure period Pex. Or, the gate line drive circuit 15 may drive a part of the gate line GCL belonging to the first detection region R1 or the gate line GCL belonging to the second detection region R2 based on the position of the finger Fg.

[0116] (Third Embodiment) FIG. 17 is a side view schematically showing the relationship between the sensor unit and the first light source and the second light source of the detection device according to the third embodiment. As shown in FIG. 17, the first filter 63 is provided on the first surface S1 side of the sensor substrate 21. The photodiode PD is provided between the first filter 63 and the first surface S1. The second filter 64 is provided on the second surface S2 side of the sensor substrate 21. That is, in the third direction Dz, the sensor unit 10 is provided between the first filter 63 and the second filter 64.

[0117] The first light source substrate 51 and the second light source substrate 52 face each other with the sensor unit 10 interposed therebetween in the third direction Dz. The first light source substrate 51 faces the first surface S1 of the sensor substrate 21. A plurality of first light sources 61 are provided on the surface of the first light source substrate 51 facing the first surface S1. That is, the first light source 61 is provided to face the first surface S1 in a direction perpendicular to the first surface S1. The first filter 63 is provided between the plurality of photodiodes PD and the first light source 61 in a direction perpendicular to the first surface S1.

[0118] The second light source substrate 52 faces the second surface S2 of the sensor substrate 21. A plurality of second light sources 62 are provided on the surface of the second light source substrate 52 facing the second surface S2. That is, the second light source 62 is provided to face the second surface S2 in a direction perpendicular to the second surface S2. The second filter 64 is provided between the second surface S2 and the second light source 62 in a direction perpendicular to the second surface S2.

[0119] In the third embodiment, the sensor unit 10 can detect information related to a living body while being sandwiched between two fingers Fg1 and Fg2. The first light L61 emitted from the first light source 61 passes through the finger Fg1 and the first filter 63 and enters the sensor unit 10. Further, the second light L62 emitted from the second light source 62 passes through the finger Fg2, the second filter 64, and the sensor substrate 21 and enters the sensor unit 10.

[0120] With such a configuration, in the third embodiment, various information related to a living body can be detected for a plurality of fingers Fg. Note that since the driving method of the detection device 1 of the third embodiment is the same as that in FIG. 11, a detailed description thereof is omitted.

[0121] (Fourth Embodiment) FIG. 18 is a plan view schematically showing the relationship between the sensor unit and the first light source and the second light source of the detection device according to the fourth embodiment. As shown in FIG. 18, in the fourth embodiment, the first light source 61 and the second light source 62 are provided on the first surface S1 of the sensor substrate 21.

[0122] Specifically, the first light source 61 and the second light source 62 are provided for each partial detection region PAA and are arranged adjacent to the photodiode PD in a region surrounded by the signal line SGL and the gate line GCL.

[0123] The first light L61 emitted from the first light source 61 and the second light L62 emitted from the second light source 62 each travel in a direction parallel to the third direction Dz, are reflected on the surface or inside of the finger Fg, and enter the photodiode PD.

[0124] Also in the fourth embodiment, information regarding different living bodies can be detected by the first light L61 and the second light L62. Further, in the fourth embodiment, since it is not necessary to provide the first light source substrate 51 and the second light source substrate 52, the detection device 1 can be miniaturized. Note that since the driving method of the detection device 1 in the fourth embodiment is the same as that in FIG. 11, a detailed description thereof is omitted. Also, the arrangement of the first light source 61 and the second light source 62 shown in FIG. 18 is merely an example and can be changed as appropriate. For example, either one of the first light source 61 and the second light source 62 may be provided in one partial detection region PAA. In this case, the partial detection region PAA provided with the first light source 61 and the partial detection region PAA provided with the second light source 62 may be arranged alternately.

[0125] (Fifth Embodiment) FIG. 19 is a side view schematically showing the relationship between the sensor unit and the first light source and the second light source of the detection device according to the fifth embodiment. FIG. 19 shows an operation example when the relative positional relationship between the finger Fg and the sensor unit 10 is different. As shown in FIG. 19, the sensor substrate 21 has a first curved surface Sa1 and a second curved surface Sa2 on the side opposite to the first curved surface Sa1. The first curved surface Sa1 is curved convexly in the direction from the second curved surface Sa2 toward the first curved surface Sa1. The second curved surface Sa2 is curved concavely along the surface of the finger Fg. A plurality of photodiodes PD are provided on the first curved surface Sa1. The sensor substrate 21 may be a film-like resin material having translucency or a curved glass substrate.

[0126] The plurality of first light sources 61-1, 61-2, 61-3 are provided along the first curved surface Sa1 and emit first light L61 in different directions. The plurality of second light sources 62-1, 62-2, 62-3 are provided facing the second curved surface Sa2 and emit second light L62 in different directions. The first light source 61-1 and the second light source 62-3 are arranged with the finger Fg therebetween and emit the first light L61 and the second light L62 in opposite directions. Similarly, the first light source 61-2 and the second light source 62-2 are arranged with the finger Fg therebetween and emit the first light L61 and the second light L62 in opposite directions. The first light source 61-3 and the second light source 62-1 are arranged with the finger Fg therebetween and emit the first light L61 and the second light L62 in opposite directions.

[0127] In the following description, when it is not necessary to distinguish and describe the first light sources 61-1, 61-2, 61-3, they are represented as the first light source 61. Also, when it is not necessary to distinguish and describe the second light sources 62-1, 62-2, 62-3, they are represented as the second light source 62.

[0128] In FIG. 19, the first light source substrate 51 and the second light source substrate 52 are omitted for illustration, but each has a curved shape along the surface of the finger Fg. Alternatively, one light source substrate may be formed in an annular shape so as to surround the finger Fg, and the first light source 61 and the second light source 62 may be provided on the inner peripheral surface of the light source substrate.

[0129] In the fifth embodiment, the first light sources 61-1, 61-2, 61-3 are turned on to detect the fingerprint of the finger Fg. The control circuit 122 detects the position and orientation of the finger Fg based on the fingerprint information.

[0130] As shown in the left diagram of FIG. 19, when the belly of the finger Fg is facing the bottom of the sensor unit 10, the control circuit 122 turns on the first light source 61-2 and the second light source 62-2 among the first light sources 61-1, 61-2, 61-3 and the second light sources 62-1, 62-2, 62-3. The first light L61 emitted from the first light source 61-2 is reflected on the surface or inside of the finger Fg and enters the photodiode PD. Also, the second light L62 emitted from the second light source 62-2 passes through the finger Fg and enters the photodiode PD.

[0131] FIG. 19 The following figure shows a case where the relative positional relationship between the finger Fg and the sensor unit 10 is different. For example, when the finger Fg rotates and the palm of the finger Fg faces a position shifted from the bottom of the sensor unit 10. In this case, the control circuit 122 turns on the first light sources 61-1, 61-2, 61-3 and the second light sources 62-1, 62-2, 62-3, and turns on the first light source 61-3 and the second light source 62-1.

[0132] Thus, in the fifth embodiment, even when the relative positional relationship between the finger Fg and the sensor unit 10 is shifted, based on the position information of the fingerprint of the finger Fg, among the plurality of first light sources 61 and the plurality of second light sources 62, the first light sources 61 and the second light sources 62 corresponding to the position (rotation angle) of the finger Fg are selected. Thereby, the first light L1 and the second light L62 can be irradiated onto the finger Fg favorably, and information regarding the living body can be detected.

[0133] Further, the first light sources 61-1, 61-2, 61-3 and the second light sources 62-1, 62-2, 62-3 are arranged at different positions and angles. For this reason, the detection device 1 can sequentially turn on the first light sources 61-1, 61-2, 61-3 and the second light sources 62-1, 62-2, 62-3 to detect information regarding the living body, for example, a blood vessel image, observed from different angles. Then, by performing image processing on these plurality of blood vessel images, a three-dimensional blood vessel image can be obtained. Thereby, when the detection device 1 is used for biometric authentication or the like, the accuracy of personal authentication can be improved.

[0134] (Third Modification Example of the Fifth Embodiment) FIG. 20 is a side view schematically showing the relationship between the sensor unit and the first light source and the second light source of the detection device according to the third modification example of the fifth embodiment. As shown in FIG. 20, in the third modification example, compared with the fifth embodiment, the difference is that the second light sources 62-1, 62-2 are provided on the sensor substrate 21.

[0135] Specifically, the second light sources 62-1 and 62-2 are provided at the outer edge of the first curved surface Sa1 of the sensor substrate 21. In other words, the second light sources 62-1 and 62-2 are respectively provided between the photodiode PD and the end of the sensor substrate 21, and the photodiode PD is provided between the second light source 62-1 and the second light source 62-2. The second light sources 62-1 and 62-2 are provided at different positions and angles from the first light sources 61-1, 61-2, and 61-3, and can emit the second light L62 at an angle different from the first light L61.

[0136] Even in the third modification, even when the relative positional relationship between the finger Fg and the sensor unit 10 is displaced, the finger Fg can be irradiated with the first light L61 or the second light L62 at an appropriate angle. In addition, since the second light source substrate 52 can be omitted, the configuration of the detection device 1 can be simplified.

[0137] (Sixth Embodiment) FIG. 21 is a plan view schematically showing the relationship between the sensor unit, the first light source, and the second light source of the detection device according to the sixth embodiment. FIG. 22 is a side view schematically showing the relationship between the sensor unit, the first light source, and the second light source of the detection device according to the sixth embodiment.

[0138] As shown in FIG. 21, the first light source 61 and the second light source 62 are provided in the peripheral region GA of the sensor substrate 21. Specifically, the sensor substrate 21 has a first side 21s1 facing the first direction Dx and a second side 21s2. The first light source 61 is provided in the region between the first side 21s1 and the outer periphery of the sensor unit 10 in the peripheral region GA. The second light source 62 is provided in the region between the second side 21s2 and the outer periphery of the sensor unit 10 in the peripheral region GA. A detection region AA is arranged between the first light source 61 and the second light source 62.

[0139] In FIG. 21, the first light source 61 and the second light source 62 are schematically shown in a rectangular shape. However, as described above, the first light source 61 and the second light source 62 may be arranged with a plurality of inorganic LEDs or a plurality of organic ELs.

[0140] As shown in FIG. 22, the sensor substrate 21 has a first curved surface Sa1 and a second curved surface Sa2, similar to the fifth embodiment. The first light source 61 and the second light source 62 are provided on the first curved surface Sa1. A photodiode PD is provided between the first light source 61 and the second light source 62. The second curved surface Sa2 has a curved shape along the surface of the belly of the finger Fg.

[0141] The first light L61 emitted from the first light source 61 and the second light L62 emitted from the second light source 62 respectively pass through the sensor substrate 21 and enter the finger Fg. The first light L61 and the second light L62 are reflected on the surface or inside of the finger Fg, pass through the sensor substrate 21, and enter the photodiode PD.

[0142] In the sixth embodiment, since it is not necessary to provide the first light source substrate 51 and the second light source substrate 52, the detection device 1 can be miniaturized. Further, since the first light source 61 and the second light source 62 are provided in the peripheral region GA, the circuit configuration of the partial detection region PAA can be simplified as compared with the fourth embodiment.

[0143] (Seventh Embodiment) FIG. 23 is a timing waveform diagram showing an operation example of the detection device according to the seventh embodiment. In the seventh embodiment, the gate line drive circuit 15 supplies a gate drive signal Vgcl of a high-level voltage (power supply voltage VDD) to a gate line block BKG(1) including a plurality of gate lines GCL in a period ta(1). The gate line block BKG(1) includes, for example, the six gate lines GCL(1) to GCL(6) shown in FIG. 3. The control circuit 122 supplies selection signals ASW1, …, ASW6 to the signal line selection circuit 16 at the same time during the period when the gate drive signal Vgcl is at a high-level voltage (power supply voltage VDD). As a result, the signal line selection circuit 16 connects the six signal lines SGL to the detection circuit 48 at the same time. As a result, the detection signals Vdet of the detection region groups PAG1 and PAG2 shown in FIG. 3 are respectively supplied to the detection circuit 48.

[0144] Similarly, during periods ta(2), …, ta(s-1), ta(s), the gate line driving circuit 15 supplies gate driving signals Vgcl(2), …, Vgcl(s-1), Vgcl(s) of high-level voltage to gate line blocks BKG(2), …, BKG(s-1), BKG(s), respectively. That is, the gate line driving circuit 15 supplies the gate driving signal Vgcl to a plurality of gate lines GCL simultaneously for each period ta.

[0145] Accordingly, during the read period Pdet, the detection device 1 can output the detection signal Vdet to the detection circuit 48 for each detection area group PAG. The detection device 1 can increase the S / N ratio in detection as compared with the case of detecting for each partial detection area PAA. Therefore, the detection device 1 can detect information regarding a living body such as a blood vessel image well. Further, in the seventh embodiment, since the time required for detecting the entire area of the detection area AA can be shortened and detection can be performed quickly, a temporal change of a blood vessel image such as a pulse wave can be detected well.

[0146] In FIG. 23, an example in which the gate line driving circuit 15 drives by bundling six gate lines GCL is shown, but it is not limited thereto. The gate line driving circuit 15 may drive by bundling five or less gate lines GCL, or may drive by bundling seven or more gate lines GCL. Further, the signal line selection circuit 16 may connect a plurality of five or less signal lines SGL to the detection circuit 48 simultaneously, or may connect a plurality of seven or more signal lines SGL to the detection circuit 48 simultaneously.

[0147] Further, the detection device 1 may perform the detection for each partial detection area PAA and the detection for each detection area group PAG in a time-division manner. For example, when performing detection with high resolution (small detection pitch) such as fingerprint detection, the detection device 1 detects for each partial detection area PAA. Further, when it is not necessary to perform detection with high resolution such as pulse wave, the detection device 1 detects for each detection area group PAG. In this case, the detection device 1 may perform detection by switching the lighting of the first light source 61 and the lighting of the second light source 62 in a time-division manner between the period of detecting for each partial detection area PAA and the period of detecting for each detection area group PAG. Thereby, it is possible to achieve both high-precision detection and detection of temporal changes according to the differences in information regarding a plurality of living bodies.

[0148] The detection area groups PAG1 and PAG2 shown in FIG. 3 each include 6×6, a total of 36 partial detection areas PAA (photodiodes PD). However, the number of partial detection areas PAA (photodiodes PD) included in the detection area groups PAG1 and PAG2 may be 35 or less, or may be 37 or more. Further, in the seventh embodiment, the number of gate lines GCL selected by the gate line drive circuit 15 and the number of signal lines SGL selected by the signal line selection circuit 16 may be different. That is, in each of the detection area groups PAG1 and PAG2, the number of partial detection areas PAA (photodiodes PD) arranged in the first direction Dx and the number of partial detection areas PAA (photodiodes PD) arranged in the second direction Dy may be different.

[0149] Also, in FIG. 3, two adjacent detection area groups PAG1 and PAG2 in the first direction Dx are shown, but the detection area groups PAG are arranged in three or more in the first direction Dx and also arranged in a plurality in the second direction Dy. That is, the plurality of detection area groups PAG are arranged in a matrix in the first direction Dx and the second direction Dy.

[0150] (Eighth Embodiment) FIG. 24 is a circuit diagram showing a plurality of partial detection regions of the detection device according to the eighth embodiment. FIG. 25 is a timing waveform diagram showing an operation example of the detection device according to the eighth embodiment. As shown in FIG. 24, in the eighth embodiment, the partial detection region PAA does not have the capacitive element Ca. That is, the source of the first switching element Tr is connected to the signal line SGL, and the drain of the first switching element Tr is connected to the cathode of the photodiode PD.

[0151] When the partial detection region PAA is irradiated with light during the period when the first switching element Tr is on, a current corresponding to the amount of light flows through the photodiode PD, and the current flows from the photodiode PD to the detection circuit 48 via the signal line SGL. That is, in the eighth embodiment, the time for accumulating charges in the capacitive element Ca can be omitted.

[0152] As shown in FIG. 25, in the reset period Prst, after the gate drive signal Vgcl(M) is supplied to the gate line GCL(M), the exposure period Pex is omitted and the read period Pdet starts. In the read period Pdet, when the gate drive signal Vgcl is sequentially supplied to each gate line GCL, the first switching element Tr is turned on and the photodiode PD is connected to the signal line SGL. A current flows from the photodiode PD to the detection circuit 48 during the period when the first switching element Tr is on. In other words, in the read period Pdet, the period during which the gate drive signal Vgcl of the high-level voltage signal is supplied is the exposure period Pex.

[0153] In the eighth embodiment, since the detection of the entire region of the detection region AA can be performed quickly, for example, the temporal change of a blood vessel image such as a pulse wave can be detected well.

[0154] In addition, in the first to eighth embodiments, the case where the gate line driving circuit 15 performs time - division selective driving for sequentially supplying a gate driving signal Vgcl to a plurality of gate lines GCL has been shown, but the present invention is not limited to this. The sensor unit 10 may perform detection by code - division multiplexing (hereinafter referred to as CDM (Code Division Multiplexing) driving). Since the CDM driving and the driving circuit are described in, for example, Japanese Patent Application No. 2018 - 005178, the description of Japanese Patent Application No. 2018 - 005178 is incorporated into this embodiment and the description is omitted.

[0155] As described above, the preferred embodiments of the present invention have been described. However, the present invention is not limited to such embodiments. The content disclosed in the embodiments is merely an example, and various modifications can be made without departing from the spirit of the present invention. Appropriate modifications made without departing from the spirit of the present invention also naturally belong to the technical scope of the present invention.

Explanation of Reference Numerals

[0156] 1 Detection device 10 Sensor unit 15 Gate line driving circuit 16 Signal line selection circuit 17 Reset circuit 21 Sensor substrate 22 TFT layer 23 Insulating layer 24 Protective film 31 Photoelectric conversion layer 34 Anode electrode 35 Cathode electrode 35 Detection circuit 51 First light source substrate 52 Second light source substrate 61 First light source 62 Second light source 63 First filter 64 Second filter AA Detection region GA Peripheral region GCL Gate line PAA Partial detection region PD Photodiode R1 First detection area R2 Second detection area S1 First surface S2 Second surface SGL Signal line ASW Selection signal Vgcl Gate drive signal Tr First switching element

Claims

1. A light source that irradiates the object to be detected with light, a sensor substrate, a plurality of photoelectric conversion elements provided in a matrix in the detection region of the sensor substrate, the plurality of photoelectric conversion elements outputting detection signals corresponding to the light reflected or transmitted by the object to be detected, a capacitance component that accumulates charges due to the photocurrent of the plurality of photoelectric conversion elements, a plurality of switching elements provided for each of the plurality of photoelectric conversion elements, a plurality of gate lines extending in the row direction and arranged in the column direction, a plurality of signal lines extending in the column direction and arranged in the row direction, a selection circuit that selects at least one signal line among the plurality of signal lines, a detection circuit connected to the selection circuit, and having each of the plurality of gate lines is connected to a plurality of switching elements arranged in the row direction among the plurality of switching elements, each of the plurality of signal lines is connected to a plurality of switching elements arranged in the column direction among the plurality of switching elements, a plurality of reset periods for sequentially supplying a predetermined reset voltage to each row of the plurality of photoelectric conversion elements, a plurality of readout periods for reading out the detection signals from each row of the plurality of photoelectric conversion elements in the detection circuit, and having one frame period has one reset period and one readout period following the one reset period, the reset periods are sequentially performed at different timings for each row of the plurality of photoelectric conversion elements, the readout periods are sequentially performed at different timings for each row of the plurality of photoelectric conversion elements, the exposure period during which charges due to the photocurrent of the photoelectric conversion elements are charged to the capacitance component is performed at different timings for each row of the plurality of photoelectric conversion elements, and is the period from the end of the reset period for each row to the end of the readout period, the light source continuously lights from the start of the reset period to the end of the readout period in the one frame period detection device.

2. The light source is a first light source that emits first light having a first emission peak wavelength, a second light source that emits second light having a second emission peak wavelength, and has the first light source emits blue light or green light, and the second light source emits red light, or, the first light source emits blue light or green light, and the second light source emits infrared light, or, the first light source emits red light, and the second light source emits infrared light The detection device according to claim 1.

3. Having a plurality of frame periods, and alternately turning on the first light source and the second light source for each of the frame periods The detection device according to claim 2.

4. A light source that irradiates light onto a detection object, A sensor substrate, A plurality of photoelectric conversion elements arranged in a matrix in a detection region of the sensor substrate, the plurality of photoelectric conversion elements outputting detection signals corresponding to the light reflected or transmitted by the detection object, A plurality of switching elements provided for each of the plurality of photoelectric conversion elements, A plurality of gate lines extending in the row direction and arranged in the column direction, A plurality of signal lines extending in the column direction and arranged in the row direction, A selection circuit that selects at least one signal line among the plurality of signal lines, A detection circuit connected to the selection circuit, and having Each of the plurality of gate lines is respectively connected to a plurality of switching elements arranged in the row direction among the plurality of switching elements, Each of the plurality of signal lines is respectively connected to a plurality of switching elements arranged in the column direction among the plurality of switching elements, A plurality of reset periods for sequentially supplying a predetermined reset voltage to the plurality of photoelectric conversion elements row by row, A plurality of readout periods for reading out the detection signals from the plurality of photoelectric conversion elements row by row in the detection circuit, and having One frame period has one reset period and one readout period following the one reset period, The reset periods are sequentially performed at different timings for each row of the plurality of photoelectric conversion elements, The readout periods are sequentially performed at different timings for each row of the plurality of photoelectric conversion elements after a predetermined period has elapsed after the reset periods of all rows of the plurality of photoelectric conversion elements have ended, The light source is turned on only for the predetermined period from the end of the reset period to the start of the readout period in each of the one frame periods Detection device.

5. The light source is A first light source that emits first light having a first emission peak wavelength, A second light source that emits second light having a second emission peak wavelength, and having The first light source emits blue light or green light, and the second light source emits red light, Or, the first light source emits blue light or green light, and the second light source emits infrared light, Or, the first light source emits red light, and the second light source emits infrared light The detection device according to claim 4.

6. Having a plurality of frame periods, and alternately turning on the first light source and the second light source for each of the frame periods The detection device according to claim 5.

7. A first light source that irradiates a detection target with first light having a first emission peak wavelength; A second light source that irradiates the detection target with second light having a second emission peak wavelength; A sensor substrate; A plurality of photoelectric conversion elements provided in a matrix in a detection region of the sensor substrate, the plurality of photoelectric conversion elements outputting detection signals corresponding to the first light or the second light reflected or transmitted by the detection target; A plurality of switching elements provided for each of the plurality of photoelectric conversion elements; A plurality of gate lines extending in a row direction and arranged in a column direction; A plurality of signal lines extending in a column direction and arranged in a row direction; A selection circuit that selects at least one signal line among the plurality of signal lines; A detection circuit connected to the selection circuit, comprising: Each of the plurality of gate lines is connected to a plurality of switching elements arranged in a row direction among the plurality of switching elements; Each of the plurality of signal lines is connected to a plurality of switching elements arranged in a column direction among the plurality of switching elements; The detection region has a first region and a second region divided in a row direction; The first region has a first color filter that transmits the first light; The second region has a second color filter that transmits the second light; The first light source and the second light source are lit simultaneously Detection device.

8. A gate line drive circuit that sequentially drives the plurality of switching elements row by row; A plurality of reset periods that sequentially supply a predetermined reset voltage to the plurality of photoelectric conversion elements row by row; A plurality of read periods that read the detection signals from the plurality of photoelectric conversion elements row by row in the detection circuit, comprising: One frame period has one reset period and one read period following the one reset period The detection device according to claim 7.

9. The first light source and the second light source are lit only during a period from the end of the reset period to the start of the read period The detection device according to claim 8.

10. The first light source and the second light source each continuously light from the start of the reset period to the end of the read period in the one frame period The detection device according to claim 8.

11. A light source that irradiates a detection target with light; A sensor substrate; A plurality of photoelectric conversion elements arranged in a matrix in a detection region of the sensor substrate, the plurality of photoelectric conversion elements outputting detection signals corresponding to the light reflected or transmitted by the object to be detected; A plurality of switching elements provided for each of the plurality of photoelectric conversion elements; A plurality of gate lines extending in the row direction and arranged in the column direction; A plurality of signal lines extending in the column direction and arranged in the row direction; A selection circuit for selecting at least one signal line among the plurality of signal lines; A detection circuit connected to the selection circuit, and having: Each of the plurality of gate lines is respectively connected to a plurality of switching elements arranged in the row direction among the plurality of switching elements; Each of the plurality of signal lines is respectively connected to a plurality of switching elements arranged in the column direction among the plurality of switching elements; A plurality of reset periods for sequentially supplying a predetermined reset voltage to each row of the plurality of photoelectric conversion elements; A plurality of readout periods for reading out the detection signals from each row of the plurality of photoelectric conversion elements in the detection circuit; One frame period has one reset period and one readout period following the one reset period; The light sources are each continuously lit from the start of the reset period to the end of the readout period in the one frame period; Among the plurality of frame periods, in the first frame period, the supply of the reset voltage and the detection of the detection signal are sequentially performed in the first scanning direction for each row, and in the second frame period following the first frame period, the supply of the reset voltage and the detection of the detection signal are sequentially performed in the second scanning direction opposite to the first scanning direction Detection device.

12. The light source is A first light source that emits first light having a first emission peak wavelength; A second light source that emits second light having a second emission peak wavelength, and The first light source emits blue light or green light, and the second light source emits red light, Or, the first light source emits blue light or green light, and the second light source emits infrared light, Or, the first light source emits red light, and the second light source emits infrared light The detection device according to claim 11.

13. The sensor substrate has a first curved surface provided with a plurality of the photoelectric conversion elements and a second curved surface on the side opposite to the first curved surface, And has a plurality of the first light sources and a plurality of the second light sources, The plurality of first light sources face the plurality of photoelectric conversion elements on the first curved surface side and are provided along the first curved surface, ​ The plurality of second light sources are provided on the side surfaces of the plurality of photoelectric conversion elements on the first curved surface side, and emit the second light in a direction different from that of the first light. The detection device according to any one of claims 2, 5, 7, and 12. **Claim 14** having a plurality of the first light sources and a plurality of the second light sources, each of the plurality of first light sources and each of the plurality of second light sources are provided adjacent to each of the plurality of photoelectric conversion elements The detection device according to any one of claims 2, 5, 7, and 12.

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