Display device

Abstract

The display device includes: a substrate; a plurality of pixels disposed on the substrate; and a plurality of first inorganic light-emitting elements and a plurality of second inorganic light-emitting elements provided in each of the plurality of pixels, the first inorganic light-emitting elements emitting first light in a visible light region, and the second inorganic light-emitting elements emitting second light in an infrared light region. The first inorganic light-emitting element and the second inorganic light-emitting elements each have an anode terminal and a cathode terminal, and among the plurality of second inorganic light-emitting elements, a first potential is supplied to the anode terminal of a second inorganic light-emitting element for a light source that emits second light, and a second potential that is lower than the first potential is supplied to the cathode terminal. In the plurality of second inorganic light-emitting elements, the second potential is supplied to the anode terminal of a second inorganic light-emitting element for detection that outputs a signal corresponding to the irradiated second light, and the first potential is supplied to the cathode terminal.

Description

[0001] This application is a divisional application of the invention patent application with application date of September 26, 2021, application number 202080024768.6, and invention name “Display Device”, and all its contents are incorporated herein for reference. Technical Field

[0002] The present invention relates to a display device. Background Art

[0003] In recent years, displays using tiny light-emitting diodes (micro LEDs) as display elements have attracted much attention (for example, see Patent Document 1). A plurality of light-emitting diodes are connected to an array substrate (a driving backplane in Patent Document 1), and the array substrate has a pixel circuit (an electronic control circuit in Patent Document 1) for driving the light-emitting diodes.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application No. 2017-529557 Summary of the invention

[0007] Technical problem to be solved by the invention

[0008] In a display using light-emitting diodes, it is desirable to have sensors that detect various information, such as information related to the proximity of a detected object such as a finger (e.g., hovering detection), biometric information for personal authentication (e.g., fingerprint detection, vein pattern detection), etc. However, when light in the visible light region from a light-emitting diode is used for biometric information detection, detection of the biometric information may become difficult depending on the type of the detected object.

[0009] An object of the present invention is to provide a display device capable of detecting biological information well.

[0010] Technical solutions to solve problems

[0011] A display device according to one embodiment of the present invention comprises: a substrate; a plurality of pixels arranged on the substrate; and a plurality of first inorganic light-emitting elements and a plurality of second inorganic light-emitting elements arranged on each of the plurality of pixels, wherein the first inorganic light-emitting elements irradiate a first light in a visible light region, and the second inorganic light-emitting elements irradiate a second light in an infrared light region. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a plan view schematically showing the display device according to the first embodiment.

[0013] Figure 2is a top view showing a pixel group including a plurality of pixels.

[0014] Figure 3 is a top view showing a plurality of pixel groups.

[0015] Figure 4 is a circuit diagram showing a pixel circuit that drives a first light emitting element.

[0016] Figure 5 : is a circuit diagram showing a pixel circuit for driving a second light emitting element for a light source.

[0017] Figure 6 This is a circuit diagram showing a pixel circuit for driving a second light-emitting element for detection.

[0018] Figure 7 yes Figure 1 VII-VII' cross-sectional view.

[0019] Figure 8 is a top view showing a plurality of pixels and cathode electrodes.

[0020] Fig. 9 is a circuit diagram showing a pixel circuit for driving a second inorganic light-emitting element in a display device according to a second embodiment.

[0021] Fig.10 It is an explanatory diagram for explaining the first detection mode and the second detection mode.

[0022] Fig.11 1 is a plan view showing the arrangement of a plurality of second light emitting elements in the second detection mode.

[0023] Fig.12 This is an explanatory diagram for explaining an example of the relationship between the detection period of the first detection mode and the detection period of the second detection mode.

[0024] Fig.13 It is a cross-sectional view showing a display device according to a third embodiment.

[0025] Fig.14 It is a cross-sectional view showing a display device according to a fourth embodiment.

[0026] Fig.15 It is a plan view showing a plurality of pixel groups of a display device according to a fifth embodiment. DETAILED DESCRIPTION

[0027] The mode (implementation method) for implementing the present invention is described in detail with reference to the accompanying drawings. The present invention is not limited by the contents described in the following implementation methods. In addition, the constituent elements described below include substantially the same constituent elements that can be easily thought of by a person skilled in the art. Furthermore, the constituent elements described below can be appropriately combined. In addition, the disclosure is only an example, and for those skilled in the art, the scheme that can be easily thought of by appropriately changing while maintaining the gist of the invention is of course also included in the scope of the present invention. In addition, in order to make the description clearer, the accompanying drawings sometimes schematically indicate the width, thickness, shape, etc. of each part compared to the actual method, but it is only an example and does not limit the interpretation of the present invention. In addition, in this specification and each figure, the same symbols are marked for the same elements as those already described in the figures that have appeared, and the detailed description is appropriately omitted.

[0028] First embodiment

[0029] Figure 1 FIG. 1 is a top view schematically showing a display device according to the first embodiment. Figure 1 As shown, the display device 1 includes an array substrate 2, a pixel group Pix, a driving circuit 12, a driving IC (Integrated Circuit) 210, and a cathode wiring 14. The array substrate 2 is a driving circuit substrate for driving each pixel group Pix, also known as a backplane or an active matrix substrate. The array substrate 2 has a substrate 10, a plurality of transistors, a plurality of capacitors, and various wirings.

[0030] like Figure 1 As shown, the display device 1 has a display area AA and a peripheral area GA. The display area AA is arranged to overlap with a plurality of pixel groups Pix and is an area for displaying an image. The peripheral area GA is an area that does not overlap with a plurality of pixel groups Pix and is arranged outside the display area AA.

[0031] A plurality of pixel groups Pix are arranged along a first direction Dx and a second direction Dy in a display area AA of the substrate 10. In the present specification, the first direction Dx and the second direction Dy are directions parallel to the surface of the substrate 10. The first direction Dx is orthogonal to the second direction Dy. However, the first direction Dx may also intersect the second direction Dy non-orthogonally. The third direction Dz is a direction orthogonal to the first direction Dx and the second direction Dy. The third direction Dz corresponds to, for example, the normal direction of the substrate 10. In addition, in the following, the top view represents the positional relationship when viewed from the third direction Dz.

[0032] The driving circuit 12 is provided in the peripheral area GA of the substrate 10. The driving circuit 12 drives a plurality of gate lines (for example, a light emission control scanning line BG, a reset control scanning line RG, an initialization control scanning line IG, and a write control scanning line SG (see Figure 4 The driving circuit 12 selects a plurality of gate lines sequentially or simultaneously and supplies a gate driving signal to the selected gate lines. Thus, the driving circuit 12 selects a plurality of pixel groups Pix connected to the gate lines.

[0033] The driver IC 210 is a circuit for controlling the display of the display device 1. The driver IC 210 is mounted in the peripheral area GA of the substrate 10 in a COG (Chip On Glass) manner. However, the present invention is not limited thereto, and the driver IC 210 may also be mounted in a COF (Chip On Film) manner on a wiring substrate connected to the peripheral area GA of the substrate 10. In addition, the wiring substrate is, for example, a flexible printed substrate or a rigid substrate.

[0034] The cathode wiring 14 is provided in the peripheral area GA of the substrate 10. The cathode wiring 14 is provided so as to surround the plurality of pixel groups Pix in the display area AA and the drive circuit 12 in the peripheral area GA. The cathodes of the plurality of light emitting elements 5 are electrically connected to the common cathode wiring 14 and are supplied with a fixed potential (for example, a ground potential). More specifically, the cathode terminal 53 (see Figure 7 ) is connected to the cathode wiring 14 via the cathode electrode 22. In addition, a portion of the cathode wiring 14 may have a slit and may be formed on the substrate 10 by two different wirings.

[0035] Figure 2 FIG. 4 is a top view showing a pixel group including a plurality of pixels. Figure 2 As shown, a pixel group Pix includes a plurality of pixels 20. For example, the pixel group Pix includes a first pixel 20R, a second pixel 20G, and a third pixel 20B. The first pixel 20R displays red as a primary color of the first color. The second pixel 20G displays green as a primary color of the second color. The third pixel 20B displays blue as a primary color of the third color. Hereinafter, in the case where the first pixel 20R, the second pixel 20G, and the third pixel 20B do not need to be distinguished respectively, they are referred to as pixels 20.

[0036] The pixels 20 each have a first light emitting element 5VL and an anode electrode 21. Furthermore, one pixel group Pix has a second light emitting element 5IR. The first light emitting element 5VL emits a first light in the visible light region. The wavelength region of the first light is, for example, about 380 nm or more and about 780 nm or less. The second light emitting element 5IR emits a second light in the infrared light region. The wavelength region of the second light is, for example, about 800 nm or more and about 950 nm or less. In addition, in the following description, when it is not necessary to distinguish between the first light emitting element 5VL and the second light emitting element 5IR for description, it is only represented as the light emitting element 5. In addition, the first pixel 20R, the second pixel 20G, and the third pixel 20B are respectively configured with the first light emitting element 5VL-R, the first light emitting element 5VL-G, and the first light emitting element 5VL-B. In addition, in the following description, when it is not necessary to distinguish between the first light emitting element 5VL-R, the first light emitting element 5VL-G, and the first light emitting element 5VL-B for description, it is only represented as the first light emitting element 5VL.

[0037] In the first pixel 20R, the second pixel 20G, and the third pixel 20B, the display device 1 displays an image by emitting different light (for example, red, green, and blue light) to each first light emitting element 5VL-R, 5VL-G, and 5VL-B. In addition, the display device 1 can detect biological information of a detected object such as a finger (Fin) or a palm based on the second light emitted from the second light emitting element 5IR. The biological information is, for example, a fingerprint, a vascular image (vein pattern) of a finger (Fin), or a palm, a pulse wave, a pulse, a blood oxygen concentration, and the like.

[0038] The light emitting elements 5 are respectively arranged in a plurality of pixel groups Pix. The light emitting element 5 is an inorganic light emitting diode (LED: Light Emitting Diode) chip having a size of about several μm or more and about 300 μm or less when viewed from above. Generally speaking, an element with a chip size of 100 μm or more is a mini LED, and an element with a size of several μm or more and less than 100 μm is a micro LED. In the present invention, LEDs of any size can be used as long as they are used separately according to the screen size of the display device 1 (the size of one pixel). The display device 1 having a micro LED in each pixel is also referred to as a micro LED display device. In addition, the small size of the micro LED does not limit the size of the light emitting element 5.

[0039] like Figure 2As shown, in a pixel group Pix, the first pixel 20R and the second light emitting element 5IR are arranged in the first direction Dx. In addition, the first pixel 20R and the third pixel 20B are arranged in the second direction Dy. The second pixel 20G and the second light emitting element 5IR are arranged in the second direction Dy. In addition, the first color, the second color, and the third color are not limited to red, green, and blue, respectively, and any color such as complementary color can be selected. In addition, the plurality of first light emitting elements 5VL can also emit four or more different colors of light. In addition, the configuration of the plurality of pixels 20 and the second light emitting element 5IR is not limited to Figure 2 For example, the second light emitting element 5IR may be adjacent to the second pixel 20G or the third pixel 20B in the first direction Dx. In addition, the first pixel 20R, the second pixel 20G, the third pixel 20B and the second light emitting element 5IR may be repeatedly arranged in this order in the first direction Dx.

[0040] Figure 3 is a top view showing a plurality of pixel groups. Figure 3 As shown, a plurality of pixel groups Pix are arranged in a matrix. The plurality of second light-emitting elements 5IR include a second light-emitting element 5IR-L for light source and a second light-emitting element 5IR-S for detection. The second light-emitting element 5IR-L for light source and the second light-emitting element 5IR-S for detection have the same structure, for example, a pn junction diode structure or a pin junction diode structure. The second light-emitting element 5IR-L for light source emits a second light when driven by a forward bias. The second light-emitting element 5IR-S for detection outputs a signal corresponding to the irradiated second light when driven by a reverse bias.

[0041] A plurality of pixel groups Pix-1, Pix-3, Pix-5, Pix-7, and Pix-9 have a second light emitting element 5IR-L for light source. A plurality of pixel groups Pix-2, Pix-4, Pix-6, and Pix-8 have a second light emitting element 5IR-S for detection. That is, the pixel groups Pix having the second light emitting element 5IR-L for light source and the pixel groups Pix having the second light emitting element 5IR-S for detection are alternately arranged in the first direction Dx and the second direction Dy.

[0042] With such a structure, the second light in the infrared light region emitted from the second light emitting element 5IR-L for light source is reflected on the surface or inside of a finger (Fin) or the like. The second light emitting element 5IR-S for detection can detect biometric information such as fingerprints or vein patterns by detecting the reflected second light. The number of the second light emitting elements 5IR-L for light source and the number of the second light emitting elements 5IR-S for detection are configured in a one-to-one relationship. Therefore, the display device 1 can achieve high-precision detection.

[0043] In addition, the configuration of the second light emitting element 5IR-L for light source and the second light emitting element 5IR-S for detection is not limited to Figure 3 The example shown. A plurality of second light-emitting elements 5IR-S for detection may be provided for one second light-emitting element 5IR-L for light source, or a plurality of second light-emitting elements 5IR-L for light source may be provided for one second light-emitting element 5IR-S for detection. In addition, among the plurality of pixel groups Pix, there may be a pixel group Pix that does not have a second light-emitting element 5IR.

[0044] Figure 4 is a circuit diagram showing a pixel circuit that drives a first light emitting element. Figure 4 The pixel circuit PIC shown is provided in the first pixel 20R, the second pixel 20G and the third pixel 20B. The pixel circuit PIC is provided on the substrate 10 and is a circuit for supplying a driving signal (current) to the first light emitting element 5VL. Figure 4 In the description of the pixel circuit PIC, the description can be applied to the pixel circuit PIC included in each of the first pixel 20R, the second pixel 20G, and the third pixel 20B.

[0045] like Figure 4 As shown, the pixel circuit PIC includes a first light emitting element 5VL, five transistors and two capacitors. Specifically, the pixel circuit PIC includes a light emitting control transistor BCT, an initialization transistor IST, a write transistor SST, a reset transistor RST and a drive transistor DRT. Some transistors can also be shared by multiple adjacent pixels 20.

[0046] The plurality of transistors included in the pixel circuit PIC are each formed of an n-type TFT (Thin Film Transistor), but the present invention is not limited thereto, and each transistor may be formed of a p-type TFT.

[0047] The light emission control scanning line BG is connected to the gate of the light emission control transistor BCT. The initialization control scanning line IG is connected to the gate of the initialization transistor IST. The writing control scanning line SG is connected to the gate of the writing transistor SST. The reset control scanning line RG is connected to the gate of the reset transistor RST.

[0048] The light emission control scanning line BG, the initialization control scanning line IG, the writing control scanning line SG, and the reset control scanning line RG are connected to the driving circuit 12 (see FIG. Figure 1The driving circuit 12 supplies a light emission control signal Vbg, an initialization control signal Vig, a write control signal Vsg, and a reset control signal Vrg to the light emission control scanning line BG, the initialization control scanning line IG, the write control scanning line SG, and the reset control scanning line RG, respectively.

[0049] Driver IC210 (refer to Figure 1 ) supplies the image signal Vsig to the pixel circuit PIC of each of the first pixel 20R, the second pixel 20G and the third pixel 20B in a time-division manner. A switching circuit such as a multiplexer is provided between each column of the first pixel 20R, the second pixel 20G and the third pixel 20B and the driver IC210. ​​The image signal Vsig is supplied to the write transistor SST via the image signal line L2. In addition, the driver IC210 supplies the reset power supply potential Vrst to the reset transistor RST via the reset signal line L3. The driver IC210 supplies the initialization potential Vini to the initialization transistor IST via the initialization signal line L4.

[0050] The light emission control transistor BCT, the initialization transistor IST, the write transistor SST and the reset transistor RST function as switch elements for selecting conduction and non-conduction between two nodes. The drive transistor DRT functions as a current control element for controlling the current flowing through the first light emitting element 5VL according to the voltage between the gate and the drain.

[0051] The cathode of the first light emitting element 5VL (cathode terminal 53-VL) is connected to the cathode power supply line L10-VL. In addition, the anode of the first light emitting element 5VL (anode terminal 52-VL) is connected to the anode power supply line L1-VL (first power supply line) via the driving transistor DRT and the light emission control transistor BCT. The anode power supply potential PVDD-VL is supplied to the anode power supply line L1-VL. The cathode power supply potential PVSS-VL is supplied to the cathode power supply line L10-VL. The anode power supply potential PVDD-VL is a higher potential than the cathode power supply potential PVSS-VL. The cathode power supply line L10-VL includes a cathode wiring 14.

[0052] In addition, the pixel circuit PIC includes a capacitor Cs1 and a capacitor Cs2. The capacitor Cs1 is a holding capacitor formed between the gate and source of the driving transistor DRT. The capacitor Cs2 is an additional capacitor formed between the source of the driving transistor DRT and the anode and cathode power supply line L10-VL of the first light emitting element 5VL.

[0053] The display device 1 drives the pixels 20 from the first row to the last row, and performs a frame period for displaying an image of one frame.

[0054] During the reset period, the light emission control transistor BCT is turned off (non-conducting state) and the reset transistor RST is turned on (conducting state) according to the potential of the light emission control scanning line BG and the reset control scanning line RG. As a result, the source of the drive transistor DRT is fixed to the reset power supply potential Vrst. The reset power supply potential Vrst is a potential where the potential difference between the reset power supply potential Vrst and the cathode power supply potential PVSS is smaller than the potential difference at which the first light emitting element 5VL starts to emit light.

[0055] Next, according to the potential of the initialization control scan line IG, the initialization transistor IST is turned on. The gate of the driving transistor DRT is fixed to the initialization potential Vini via the initialization transistor IST. In addition, the driving circuit 12 turns on the light emitting control transistor BCT and turns off the reset transistor RST. When the source potential of the driving transistor DRT becomes (Vini-Vth), the driving transistor is turned off, and the deviation of the threshold voltage Vth of the driving transistor DRT of each pixel 20 is offset.

[0056] Next, during the video signal writing operation period, the light emission control transistor BCT is turned off, the initialization transistor IST is turned off, and the writing transistor SST is turned on. The video signal Vsig is input to the gate of the driving transistor DRT.

[0057] Next, during the light emitting operation, the light emitting control transistor BCT is turned on and the write transistor SST is turned off. The anode power supply potential PVDD is supplied from the anode power supply line L1-VL to the drive transistor DRT via the light emitting control transistor BCT. The drive transistor DRT supplies a current corresponding to the voltage between the gate and the source to the first light emitting element 5VL. The first light emitting element 5VL emits light at a brightness corresponding to the current.

[0058] In addition, the above Figure 4 The structure of the pixel circuit PIC shown is only an example and can be modified as appropriate. For example, the number of wirings and the number of transistors in one pixel 20 may be different.

[0059] Figure 5 is a circuit diagram showing a pixel circuit of a second light emitting element used to drive a light source. Figure 5 As shown, the pixel circuit PIC-IRL has an anode power supply line L1-IRL, a cathode power supply line L10-IRL, and a current control circuit 55. The anode power supply potential PVDD-IRL (first potential) is supplied to the anode terminal 52-IRL of the second light-emitting element 5IR-L for the light source via the anode power supply line L1-IRL. The cathode power supply potential PVSS-IRL (second potential) is supplied to the cathode terminal 53-IRL of the second light-emitting element 5IR-L for the light source via the cathode power supply line L10-IRL. As a result, the second light-emitting element 5IR-L for the light source is driven by a forward bias.

[0060] A current control circuit 55 is connected to the anode power supply line L1-IRL. The current control circuit 55 is a circuit for controlling the drive signal (current) supplied to the second light emitting element 5IR-L for the light source. The current control circuit 55 can be, for example, Figure 4 The pixel circuit PIC shown in FIG. 1 has a circuit structure of multiple transistors. However, a detection control signal is supplied to the current control circuit 55 instead of the image signal Vsig. The second light emitting element 5IR-L emits the second light of infrared light, but does not emit the first light for image display. In addition, the anode power supply potential PVDD-IRL and the cathode power supply potential PVSS-IRL supplied to the second light emitting element 5IR-L for light source can be respectively Figure 4 The anode power supply potential PVDD-VL and the cathode power supply potential PVSS-VL in the pixel circuit PIC shown may have a common potential or may have different potentials. In other words, the anode power supply line L1-IRL connected to the second light emitting element 5IR-L may be a wiring different from the anode power supply line L1-VL connected to the first light emitting element 5VL. In addition, the cathode power supply line L10-IRL connected to the second light emitting element 5IR-L may be a wiring different from the cathode power supply line L10-VL connected to the first light emitting element 5VL.

[0061] Figure 6 FIG. 1 is a circuit diagram showing a pixel circuit of a second light-emitting element for driving detection. Figure 6 As shown, the pixel circuit PIC-IRS has an anode power line L1-IRS, a cathode power line L10-IRS, a third switch element SW3, a fourth switch element SW4, a capacitor Ca, and a signal output line Lout. The cathode power line L10-IRS supplies the cathode power potential PVSS-IRS (second potential) to the anode terminal 52-IRS of the second light-emitting element 5IR-S for detection. The anode power potential PVDD-IRS (first potential) is supplied to the cathode terminal 53-IRS of the second light-emitting element 5IR-S for detection via the anode power line L1-IRS. As a result, the second light-emitting element 5IR-S for detection is driven by reverse bias.

[0062] The reference potential VR is supplied to the capacitor Ca. Based on the control signal from the driving IC 210, when the third switch element SW3 is turned on and the fourth switch element SW4 is turned off, the second light emitting element 5IR-S for detection is connected to the capacitor Ca. As a result, a current corresponding to the irradiated second light flows from the second light emitting element 5IR-S to the capacitor Ca. As a result, charge is accumulated in the capacitor Ca.

[0063] Based on the control signal from the driver IC 210, when the third switch element SW3 is turned off and the fourth switch element SW4 is turned on, the capacitor Ca is connected to the signal output line Lout. According to the charge accumulated in the capacitor Ca, the current flows through the signal output line Lout. The display device 1 has a detection circuit 56 connected to the signal output line Lout. The detection circuit 56 is a circuit that detects a signal corresponding to the light amount of the second light irradiated on each second light-emitting element 5IR-S for detection. The detection circuit 56 can be included in the driver IC 210, and can also be included in an IC provided on a wiring substrate connected to the substrate 10.

[0064] In addition, the anode power supply potential PVDD-IRS and the cathode power supply potential PVSS-IRS supplied to the second light emitting element 5IR-S for detection may be respectively Figure 4 The anode power supply potential PVDD-VL and the cathode power supply potential PVSS-VL in the pixel circuit PIC shown in the figure may be common potentials or different potentials. In addition, when the cathode terminal 53-VL of the first light emitting element 5VL and the cathode terminal 53-IRS of the second light emitting element 5IR-S for detection are connected to the common cathode electrode 22-VL, the cathode terminal 53-IRS of the second light emitting element 5IR-S for detection is supplied with Figure 4 The cathode power supply potential PVSS-VL shown in the figure is used as the first potential. In this case, a potential lower than the cathode power supply potential PVSS-VL can be supplied to the anode terminal 52-IRS of the second light-emitting element 5IR-S for detection as the second potential. In other words, the anode power supply line L1-IRS connected to the second light-emitting element 5IR-S can also be a wiring different from the anode power supply line L1-VL connected to the first light-emitting element 5VL. In addition, the cathode power supply line L10-IRS connected to the second light-emitting element 5IR-S can also be a wiring different from the cathode power supply line L10-VL connected to the first light-emitting element 5VL.

[0065] Next, the cross-sectional structure of the display device 1 will be described. Figure 7 yes Figure 1 VII-VII' section view. Figure 7 As shown, in the display device 1, the light emitting element 5 is arranged on the array substrate 2. Figure 7 , the cross-sectional structures of the first light-emitting element 5VL-R and the second light-emitting element 5IR-L used as a light source are shown, but the description of the first light-emitting element 5VL-R can also be applied to the first light-emitting elements 5VL-G and 5VL-B.

[0066] The array substrate 2 has a substrate 10, an anode electrode 21, an opposing electrode 24, a connecting electrode 24a, various transistors, various wirings, and various insulating films. The substrate 10 is an insulating substrate, for example, a glass substrate such as quartz glass, alkali-free glass, or a resin substrate such as polyimide can be used. In addition, the anode electrode 21 includes an anode electrode 21-VL, an anode electrode 21-IRL, and an anode electrode 21-IRS. In the following description, when no special distinction is required, it is only recorded as the anode electrode 21. In addition, when there is no need to distinguish between the anode electrode 21-IRL and the anode electrode 21-IRS, it is only recorded as the anode electrode 21-IR connected to the second light-emitting element IR.

[0067] In addition, in this specification, in the direction perpendicular to the surface of the substrate 10, the direction from the substrate 10 toward the light emitting element 5 is referred to as the "upper side" or simply "upper". In addition, the direction from the light emitting element 5 toward the substrate 10 is referred to as the "lower side" or simply "lower". In addition, when expressing a mode of arranging another structure on a certain structure, when it is simply expressed as "upper", unless otherwise specified, it includes both a case where the other structure is arranged directly above the certain structure in a manner of contacting the certain structure and a case where the other structure is arranged above the certain structure via another structure.

[0068] An undercoat film 31 is provided on the substrate 10. The undercoat film 31, the insulating films 32, 33, 34, and the insulating films 36, 37 are inorganic insulating films, such as silicon oxide (SiO2), silicon nitride (SiN), or the like.

[0069] The driving transistor DRT is provided on the undercoat film 31. Figure 7 , a driving transistor DRT and a writing transistor SST are shown among a plurality of transistors, but the light-emitting control transistor BCT, the initialization transistor IST and the reset transistor RST included in the pixel circuit PIC also have the same stacked structure as the driving transistor DRT. In addition, the driving transistor DRT-IRL included in the current control circuit 55 connected to the second light-emitting element 5IR-L for the light source also has the same structure as the driving transistor DRT connected to the first light-emitting element 5VL-R. Moreover, the switching elements SW1, SW2, SW3, and SW4 connected to the second light-emitting element 5IR also have the same structure as the driving transistor DRT connected to the first light-emitting element 5VL. In addition, in the peripheral area GA, a transistor Tr included in the driving circuit 12 is provided. In addition, in the following description, when it is not necessary to distinguish between the driving transistor DRT-IV of the first light-emitting element 5VL and the driving transistor DRT-VL of the second light-emitting element 5IR-L for the light source, it is only represented as the driving transistor DRT.

[0070] The driving transistor DRT includes a semiconductor layer 25, a first gate electrode 26, a second gate electrode 27, a source electrode 28, and a drain electrode 29. The first gate electrode 26 is disposed on a base coat film 31. An insulating film 32 covers the first gate electrode 26 and is disposed on the base coat film 31. The semiconductor layer 25 is disposed on the insulating film 32. For example, polycrystalline silicon can be used for the semiconductor layer 25. However, the semiconductor layer 25 is not limited thereto, and may also be a microcrystalline oxide semiconductor, an amorphous oxide semiconductor, a low-temperature polycrystalline silicon, or the like.

[0071] The insulating film 33 covers the semiconductor layer 25 and is provided on the insulating film 32. The second gate electrode 27 is provided on the insulating film 33. In the semiconductor layer 25, a channel region 25a is provided in a portion sandwiched by the first gate electrode 26 and the second gate electrode 27. In addition, as the driving transistor DRT, only an n-type TFT is shown, but a p-type TFT may also be formed at the same time.

[0072] In addition, the first wiring 27a and the second gate electrode 27 are provided in the same layer. The first gate electrode 26, the second gate electrode 27 and the first wiring 27a are composed of, for example, aluminum (Al), copper (Cu), silver (Ag), molybdenum (Mo) or an alloy film thereof. The driving transistor DRT is a double-gate structure provided with the first gate electrode 26 and the second gate electrode 27. However, it is not limited thereto, and the driving transistor DRT may be a bottom-gate structure provided with only the first gate electrode 26, or a top-gate structure provided with only the second gate electrode 27.

[0073] The source electrode 28 and the drain electrode 29 are connected to the semiconductor layer 25 via contact holes provided in the insulating films 33 and 34. The source electrode 28 and the drain electrode 29 are formed of a stacked film of TiAlTi or TiAl, which is a stacked structure of titanium and aluminum, for example.

[0074] The capacitor Cs1 is formed by the first wiring 27a and the source electrode 28 which are opposed to each other via the insulating film 34. The capacitor Cs1 also includes a capacitor formed by the semiconductor layer 25 and the first wiring 27a which are opposed to each other via the insulating film 32.

[0075] In addition, Figure 7 In the figure, the structure of the driving transistor DRT among the multiple transistors included in the pixel circuit PIC, the pixel circuit PIC-IRL and the pixel circuit PIC-IRS is described, but the transistors included in the pixel circuit PIC, such as the write transistor SST, and the transistor Tr arranged in the peripheral area GA also have the same cross-sectional structure as the driving transistor DRT, and the detailed description is omitted.

[0076] The insulating film 35 covers the driving transistor DRT and is provided on the insulating film 34. An organic material such as photosensitive acrylic can be used for the insulating film 35. The insulating film 35 is a planarizing film that can planarize unevenness formed by the driving transistor DRT or various wirings.

[0077] The counter electrode 24, the insulating film 36, the anode electrode 21, and the insulating film 37 are sequentially stacked on the insulating film 35. The counter electrode 24 is made of a light-transmitting conductive material such as ITO (Indium Tin Oxide). The connecting electrode 24a is provided in the same layer as the counter electrode 24. The connecting electrode 24a is connected to the source electrode 28 at the bottom of the contact hole.

[0078] The anode electrode 21 is electrically connected to the connection electrode 24a and the source electrode 28 via a contact hole provided in the insulating film 36. Thus, the anode electrode 21 is electrically connected to the drive transistor DRT. The anode electrode 21 is, for example, a stacked structure of molybdenum (Mo) and aluminum (Al). In addition, the anode electrode 21 may also be a metal or alloy containing any one or more of molybdenum and titanium, or a light-transmitting conductive material.

[0079] A capacitor Cs2 is formed between the anode electrode 21 and the counter electrode 24 that face each other via the insulating film 36. The insulating film 37 covers the peripheral portion of the anode electrode 21 and insulates the anode electrodes 21 of the adjacent pixels 20.

[0080] The insulating film 37 has an opening for mounting the light emitting element 5 at a position overlapping with the anode electrode 21. The size of the opening of the insulating film 37 is an opening having an area larger than that of the light emitting element 5 in consideration of the mounting offset amount in the mounting process of the light emitting element 5. In addition, the anode terminal 52 includes the anode terminal 52-VL, the anode terminal 52-IRL, and the anode terminal 52-IRS. In the following description, when no special distinction is required, it is simply recorded as the anode terminal 52. In addition, when no special distinction is required between the anode terminal 52-IRL and the anode terminal 52-IRS, it is simply recorded as the anode terminal 52-IR. In addition, the cathode terminal 53 includes the cathode terminal 53-VL, the cathode terminal 53-IRL, and the cathode terminal 53-IRS. In the following description, when no special distinction is required, it is simply recorded as the cathode terminal 53. In addition, when no special distinction is required between the cathode terminal 53-IRL and the cathode terminal 53-IRS, it is simply recorded as the cathode terminal 53-IR.

[0081] The first light emitting element 5VL is installed in such a manner that the anode terminal 52-VL contacts the anode electrode 21-VL. The anode electrode 21-VL supplies the anode power supply potential PVDD-VL to the anode terminal 52-VL of the first light emitting element 5VL. In addition, the second light emitting element 5IR-L for light source and the second light emitting element 5IR-S for detection are also installed in such a manner that the anode terminals 52-IRL and 52-IRS contact the anode electrodes 21-IRL and 21-IRS, respectively. The second light emitting element 5IR-S for detection may also be installed in the opposite direction to the second light emitting element 5IR-L for light source. That is, it may also be installed in such a manner that the cathode terminal 53 contacts the anode electrode 21 and is driven by reverse bias.

[0082] The light emitting element 5 has a semiconductor layer 51, an anode terminal 52 and a cathode terminal 53. The semiconductor layer 51 can be a structure in which an n-type cladding layer, an active layer and a p-type cladding layer are stacked. The semiconductor layer 51 can be made of, for example, compound semiconductors such as gallium nitride (GaN), aluminum indium gallium phosphide (AlInGaP) or aluminum gallium arsenide (AlGaAs) or gallium arsenic phosphide (GaAsP), gallium arsenide (GaAs). For each of the first light emitting element 5VL and the second light emitting element 5IR, the semiconductor layer 51 can also be made of different materials. In addition, in order to improve efficiency, a multi-quantum well structure (MQW structure) in which well layers and barrier layers composed of several atomic layers are periodically stacked can also be used as an active layer.

[0083] An element insulating film 38 is provided between the plurality of light emitting elements 5. The element insulating film 38 is formed of a resin material. The element insulating film 38 covers at least the side surfaces of the light emitting elements 5, and the element insulating film 38 is not provided on the cathode terminal 53 of the light emitting element 5. The element insulating film 38 is formed flat so that the upper surface of the element insulating film 38 and the upper surface of the cathode terminal 53 are formed in the same plane. However, the position of the upper surface of the element insulating film 38 may be different from the position of the upper surface of the cathode terminal 53.

[0084] The cathode electrode 22 covers the plurality of light emitting elements 5 and the element insulating film 38 and is electrically connected to the plurality of light emitting elements 5. More specifically, the cathode electrode 22 is provided over the upper surface of the element insulating film 38, the upper surface of the cathode terminal 53 of the first light emitting element 5VL and the second light emitting element 5IR. The cathode electrode 22 can be made of a light-transmitting conductive material such as ITO, for example. Thus, the emitted light from the light emitting element 5 can be efficiently taken out to the outside. In addition, in the second light emitting element 5IR-S for detection, the cathode electrode 22-IRS is connected to the anode terminal 52-IRS, and the anode electrode 21-IRS is connected to the cathode terminal 53-IRS. In addition, the cathode electrode 22 includes the cathode electrode 22-VL, the cathode electrode 22-IRL, and the cathode electrode 22-IRS. In the following description, when no special distinction is required, it is only recorded as the cathode electrode 22. In addition, when there is no need to distinguish between the cathode electrode 22-IRL and the cathode electrode 22-IRS, it is only recorded as the cathode electrode 22-IR connected to the second light emitting element IR. The cathode electrode 22 is composed of a plurality of conductive layers stacked with insulating layers interposed therebetween. The cathode electrode 22 -VL and the cathode electrode IRL are formed of different conductive layers and may be electrically insulated from each other.

[0085] The cathode electrode 22 is connected to the cathode wiring 14 provided on the side of the array substrate 2 via the contact hole H11 provided on the outside of the display area AA. Specifically, the contact hole H11 is provided on the element insulating film 38 and the insulating film 35, and the cathode wiring 14 is provided on the bottom surface of the contact hole H11. The cathode wiring 14 is provided on the insulating film 34. That is, the cathode wiring 14 is provided on the same layer as the source electrode 28 and the drain electrode 29, and is formed of the same material. The cathode electrode 22 is provided continuously from the display area AA to the peripheral area GA, and is connected to the cathode wiring 14 at the bottom of the contact hole H11.

[0086] A black member 23 is provided on the cathode electrode 22. The black member 23 is, for example, a low-reflection film made of a material having a lower light reflectivity than the anode electrode 21. The black member 23 can be made of a black-colored resin material, carbon, or a metal or metal oxide that appears black due to thin film interference.

[0087] The second opening OP2 is provided in the black member 23 in the region overlapping with the first light emitting element 5VL. That is, in the second opening OP2, the cathode electrode 22 is in contact with the adhesive layer 85 on the upper side of the first light emitting element 5VL. In the peripheral portion of the second opening OP2, the black member 23 provided on the cathode electrode 22 is in contact with the adhesive layer 85. The light emitted from the first light emitting element 5VL travels toward the display surface side through the second opening OP2 and is displayed as a display image.

[0088] In addition, the light emitted from the first light emitting element 5VL to the side or the bottom is reflected by various wirings of the array substrate 2. The light reflected by the array substrate 2 is shielded by the black component 23, which can suppress the reflected light from being emitted to the display surface side. In addition, the external light incident from the display surface is absorbed by the black component 23, which suppresses the intrusion into the array substrate 2. Thus, the reflected light can be suppressed from being seen by the observer. Therefore, the display device 1 can suppress the color mixing of the light between the pixels 20 and the emission of unintentional unnecessary light from the display surface, thereby suppressing the reduction in the quality of the displayed image.

[0089] In the region overlapping with the second light emitting element 5IR, the cathode electrode 22 is provided with a first opening OP1, and the black component 23 is provided with a second opening OP2. The second opening OP2 is provided in the region overlapping with the first opening OP1. The cathode electrode 22 is connected to the peripheral portion of the cathode terminal 53. The adhesive layer 85 is provided along the step formed by the first opening OP1 and the second opening OP2, and the cathode terminal 53 is in contact with the adhesive layer 85 on the upper side of the second light emitting element 5IR.

[0090] With such a structure, the second light in the infrared light region emitted from the second light emitting element 5IR-L for light source travels toward the display surface side through the first opening OP1 and the second opening OP2 without passing through the cathode electrode 22 and the black component 23. In addition, the second light reflected by a finger (Fin) or the like enters the second light emitting element 5IR-S for detection through the first opening OP1 and the second opening OP2. Thus, compared with the case where the second light in the infrared light region is emitted from the second light emitting element 5IR-L for light source through the cathode electrode 22 formed by ITO or the like, the intensity reduction of the second light incident on the finger (Fin) can be suppressed. Alternatively, in the second light emitting element 5IR-S for detection, compared with the case where the second light is incident through the cathode electrode 22, the intensity reduction of the second light incident on the second light emitting element 5IR-S for detection can be suppressed.

[0091] A circular polarizing plate 7 is provided on the cathode electrode 22 and the black component 23 via an adhesive layer 85. In other words, a plurality of light emitting elements 5 are provided between the substrate 10 and the circular polarizing plate 7 in a direction perpendicular to the substrate 10. The circular polarizing plate 7 includes, for example: a linear polarizing plate; and a 1 / 4 phase difference plate (also referred to as a 1 / 4 wavelength plate), which is provided on one side of the linear polarizing plate. Compared with the linear polarizing plate, the 1 / 4 phase difference plate is provided at a position closer to the substrate 10.

[0092] For example, external light (incident light) passes through a linear polarizer, thereby becoming linearly polarized light. The linearly polarized light passes through a 1 / 4 phase difference plate, thereby becoming circularly polarized light. The circularly polarized light is reflected by the detection electrode Rx and the wiring of the array substrate 2, and becomes circularly polarized light (reflected light) in the opposite direction to the incident light. The reflected light passes through the 1 / 4 phase difference plate again, thereby becoming linearly polarized light orthogonal to the incident light, and is absorbed by the linear polarizer. Thus, in the display device 1, the reflection of external light is suppressed.

[0093] Figure 8 is a top view showing a plurality of pixels and cathode electrodes. Figure 8 In FIG. 2 , the black component 23 is indicated by oblique lines. Figure 8 As shown, the black component 23 is continuously provided between the adjacent plurality of pixels 20. In the region where the second opening OP2 is provided, the first light emitting elements 5VL-R, 5VL-G, 5VL-B and the second light emitting element 5IR are provided respectively. The area of ​​the second opening OP2 when viewed from above is larger than the area of ​​each light emitting element 5. The area of ​​the second opening OP2 when viewed from above is at least larger than the area of ​​the upper surface of each light emitting element 5.

[0094] In addition, in the region overlapping with the second light emitting element 51R, the area of ​​the second opening OP2 when viewed from above is larger than the area of ​​the first opening OP1 of the cathode electrode 22. In other words, the width of the second opening OP2 in the first direction Dx is larger than the width of the first opening OP1 in the first direction Dx. In addition, the width of the second opening OP2 in the second direction Dy is larger than the width of the first opening OP1 in the second direction Dy.

[0095] With such a structure, the extraction efficiency of the second light emitted from the second light emitting element 5IR-L for the light source can be improved. In addition, the second light reflected by the finger (Fin) is separated and incident on each of the plurality of second light emitting elements 5IR-S for detection, so that crosstalk between the pixels 20 can be suppressed. Therefore, the display device 1 can achieve high-precision detection.

[0096] In addition, the structure of the display device 1 can be changed appropriately. For example, it is also possible not to set Figure 7 , Figure 8 The cathode electrode 22 is shown in the first opening OP1, and the cathode electrode 22 is continuously provided on the upper surface of the second light emitting element 5IR.

[0097] As described above, the display device 1 includes: a substrate 10; a plurality of pixel groups Pix (pixels); and a plurality of first light emitting elements 5VL (first inorganic light emitting elements) and a plurality of second light emitting elements 5IR (second inorganic light emitting elements), which are provided on each of the plurality of pixel groups Pix. The first light emitting element 5VL and the second light emitting element 5IR respectively have an anode terminal 52 and a cathode terminal 53. The first light emitting element VL emits first light in the visible light region, and the second light emitting element 5IR emits second light in the infrared light region.

[0098] Thus, the display device 1 can detect biological information based on the second light by emitting the second light in the infrared light region from the second light emitting element 5IR. The second light emitting element 5IR is provided separately from the plurality of first light emitting elements 5VL for displaying images, and the second light in the infrared light region is not visible to the observer, so that the display device 1 can suppress the degradation of the displayed image quality caused by the detection of biological information.

[0099] In addition to the second light emitted from the second light emitting element 5IR, the display device 1 can also use the first light of visible light emitted from the first light emitting element 5VL for detecting biometric information. For example, the display device 1 can irradiate the first light when detecting a fingerprint, and irradiate the second light when detecting a vein pattern. Thus, the display device 1 can detect various biometric information well.

[0100] Second embodiment

[0101] Fig. 9 2 is a circuit diagram showing a pixel circuit for driving a second inorganic light emitting element in a display device according to Embodiment 2. In the following description, the same reference numerals are used for the same components as those described in the above embodiment, and duplicate descriptions are omitted.

[0102] In the first embodiment, the case where the second light emitting elements 5IR are driven differently for each pixel group Pix is ​​described. That is, in the first embodiment, the case where the second light emitting element 5IR-L for light source and the second light emitting element 5IR-S for detection are arranged for each pixel group Pix is ​​described. Without being limited to this, in the display device 1A of the second embodiment, the second light emitting element 5IR can be driven differently in a time-division manner.

[0103] like Fig. 9As shown, the pixel circuit PIC-IR has an anode power line L1-IR, a cathode power line L10-IR, a power line switching circuit 57 and a detection switching circuit 58. The power line switching circuit 57 has a first switching element SW1 and a second switching element SW2. The anode power line L1-IR supplies an anode power supply potential PVDD-IR (first potential) to the second light-emitting element 5IR. The cathode power line L10-IR supplies a cathode power supply potential PVSS-IR (second potential) to the second light-emitting element 5IR. The first switching element SW1 switches the connection between the anode power line L1-IR and the cathode power line L10-IR and the anode terminal 52 of the second light-emitting element 5IR. The second switching element SW2 switches the connection between the anode power line L1-IR and the cathode power line L10-IR and the cathode terminal 53-IR of the second light-emitting element 5IR. In addition, the structures of the third switching element SW3, the fourth switching element SW4 and the capacitor Ca of the detection switching circuit 58 are the same as Figure 6 The pixel circuit PIC-IRS shown is the same.

[0104] When the second light emitting element 5IR is used as a light source, the first switch element SW1 connects the anode power line L1-IR and the anode terminal 52-IR of the second light emitting element 5IR based on a control signal from the driver IC 210. In other words, the first switch element SW1 disconnects the cathode power line L10-IR and the anode terminal 52-IR of the second light emitting element 5IR.

[0105] In addition, the second switch element SW2 connects the cathode power line L10-IR and the cathode terminal 53-IR of the second light-emitting element 5IR based on the control signal from the driver IC 210. In other words, the second switch element SW2 disconnects the anode power line L1-IR and the cathode terminal 53-IR of the second light-emitting element 5IR.

[0106] Thus, the second light emitting element 5IR supplies the anode power supply potential PVDD-IR (first potential) to the anode terminal 52-IR, and supplies the cathode power supply potential PVSS-IR (second potential) to the cathode terminal 53-IR. That is, the second light emitting element 5IR is driven by a forward bias, and a driving signal (current) is supplied via the current control circuit 55. The second light emitting element 5IR emits the second light by the current supplied from the current control circuit 55.

[0107] In this case, the third switch element SW3 of the detection switching circuit 58 is turned off, and the current from the second light emitting element 5IR does not flow through the capacitor Ca and the detection circuit 56. Thus, the second light emitting element 5IR operates as the second light emitting element 5IR-L for the light source.

[0108] When the second light emitting element 5IR is used as a detection sensor, the first switch element SW1 connects the cathode power line L10-IR and the anode terminal 52-IR of the second light emitting element 5IR based on a control signal from the driver IC 210. In other words, the first switch element SW1 disconnects the anode power line L1-IR and the anode terminal 52-IR of the second light emitting element 5IR.

[0109] In addition, the second switch element SW2 connects the anode power line L1-IR and the cathode terminal 53-IR of the second light-emitting element 5IR based on the control signal from the driver IC 210. In other words, the second switch element SW2 disconnects the cathode power line L10-IR and the cathode terminal 53-IR of the second light-emitting element 5IR.

[0110] Thus, the second light emitting element 5IR supplies the anode power supply potential PVDD-IR (first potential) to the cathode terminal 53-IR, and supplies the cathode power supply potential PVSS-IR (second potential) to the anode terminal 52-IR. That is, the second light emitting element 5IR is reverse bias driven, and outputs a current corresponding to the irradiated second light to the detection switching circuit 58. The detection switching circuit 58 outputs the current from the second light emitting element 5IR to the detection circuit 56 through the above-mentioned operation. Thus, the second light emitting element 5IR operates as the second light emitting element 5IR-S for detection.

[0111] The display device 1A of the second embodiment can switch the single second light emitting element 5IR into the second light emitting element 5IR-L for light source and the second light emitting element 5IR-S for detection in a time-division manner through the operation of the first switch element SW1 and the second switch element SW2 of the pixel circuit PIC-IR.

[0112] Fig.10 It is an explanatory diagram for explaining the first detection mode and the second detection mode. Fig.11 FIG. 4 is a top view showing the arrangement of a plurality of second light emitting elements in the second detection mode. Fig.10 As shown, the display device 1A can switch and execute the first detection mode M1 and the second detection mode M2 ​​in a time-division manner. In the first detection mode M1 and the second detection mode M2, the number of second light emitting elements 5IR-L for light source and the number of second light emitting elements 5IR-S for detection are different.

[0113] The first detection mode M1 is a detection action for detecting the biological information of a finger (Fin) in contact with or close to the display surface. In the first detection mode M1, the outgoing light Li emitted from the second light-emitting element 5IR-L for the light source is reflected by the finger (Fin) in contact with or close to the display surface. The second light-emitting element 5IR-S for detection can detect the biological information of the finger (Fin) by detecting the reflected light Lr. The second detection mode M2 ​​is a detection action for detecting a finger (Fin) in a non-contact state away from the display surface. In the second detection mode M2, the outgoing light Li emitted from the second light-emitting element 5IR-L for the light source is reflected by the finger (Fin) at a position away from the display surface. The second light-emitting element 5IR-S for detection detects the position and posture of the finger (Fin) in a non-contact state by detecting the reflected light Lr. The second detection mode M2 ​​is also called hovering detection.

[0114] In the first detection mode M1, the pixel circuit PIC-IR of each pixel group Pix drives each second light emitting element IR, thereby, for example, becoming Figure 3 The configuration relationship of the second light emitting element 5IR-L for light source and the second light emitting element 5IR-S for detection is shown. Figure 3 In the first detection mode M1 shown, the second light emitting element 5IR-L for light source and the second light emitting element 5IR-S for detection are arranged alternately. Thus, the display device 1A can reduce the arrangement interval of the second light emitting element 5IR-S for detection, and can detect biometric information such as fingerprints and vein patterns with high precision.

[0115] In the second detection mode M2, the pixel circuit PIC-IR of each pixel group Pix drives each second light emitting element IR, thereby, for example, Fig.11 As shown in FIG. 1 , a plurality of second light emitting elements 5IR-S for detection are arranged around a second light emitting element 5IR-L for light source. Fig.11 In the example, the pixel group Pix-5 has a second light emitting element 5IR-L for light source, and the pixel groups Pix-1 to Pix-4 and the pixel groups Pix-6 to Pix-9 have a second light emitting element 5IR-S for detection. Fig.11 In the second detection mode M2, eight second light-emitting elements 5IR-S for detection are set relative to one second light-emitting element 5IR-L for light source. In other words, in the second detection mode M2, the ratio of the number of second light-emitting elements 5IR-S for detection to the number of second light-emitting elements 5IR-L for light source is greater than that in the first detection mode M1.

[0116] Therefore, if Fig.10As shown, in the second detection mode M2, the finger (Fin) is located away from the display surface of the display device 1A, and even if the intensity of the reflected light Lr reflected from the finger (Fin) is small, the reflected light Lr can be detected by the second light emitting element 5IR-S for detection more than in the first detection mode M1. As a result, the detection sensitivity of the second light emitting element 5IR-S for detection can be improved as a whole, and hovering detection can be performed well.

[0117] In addition, the display device 1A can switch between the second light emitting element 5IR-L for light source and the second light emitting element 5IR-S for detection for each pixel group Pix. Figure 3 and Fig.11 The configuration relationship shown can improve the degree of freedom of configuration of the second light emitting element 5IR-L for light source and the second light emitting element 5IR-S for detection. The display device 1A can also make the ratio of the second light emitting element 5IR-L for light source and the second light emitting element 5IR-S for detection different according to the various biological information detected. In addition, the display device 1A can also drive the second light emitting element 5IR-L for light source and the second light emitting element 5IR-S for detection in the area overlapping with the finger (Fin) in the display area AA, and stop driving the second light emitting element 5IR in the pixel group Pix that does not overlap with the finger (Fin).

[0118] Fig.12 1A is an explanatory diagram for explaining an example of the relationship between the detection period of the first detection mode and the detection period of the second detection mode. The display device 1A may arbitrarily arrange the first detection mode M1 and the second detection mode M2 ​​in a time-division manner.

[0119] For example, Fig.12 As shown, the display device 1A may repeatedly execute the second detection mode M2 ​​during the non-display period ND, and alternately execute the first detection mode M1 and the second detection mode M2 ​​in the frame period 1F. The non-display period ND is a period during which the first light emitting element 5VL is turned off and the display of the image is stopped. The non-display period ND includes, for example, a period during which the power supply of the display device 1A is stopped, and a period in a sleep mode during which the display is stopped when there is no input operation for a predetermined period.

[0120] The display device 1A executes the second detection mode M2 ​​during the non-display period ND. Specifically, the display device 1A turns on the second light-emitting element 5IR-L for light source, and detects the approach of the finger (Fin) based on the signal from the second light-emitting element 5IR-S for detection. In the absence of the finger (Fin), the display device 1A continues the non-display period ND, and in the case of the finger (Fin) being in the approaching state, the display device 1A executes the frame period 1F for displaying the image.

[0121] In the frame period 1F, the display device 1A lights up the first light emitting element 5VL to display an image. The second light emitting element 5IR-L used as the light source emits the second light in the infrared light region, so that the first detection mode M1 and the second detection mode M2 ​​can be detected during the period overlapping with the frame period 1F. In this case, the second light emitted from the second light emitting element 5IR-L used as the light source will not be seen by the observer, so it is possible to suppress the degradation of the quality of the displayed image.

[0122] exist Fig.12 In the frame period 1F, the first detection mode M1 and the second detection mode M2 ​​are alternately executed, but the present invention is not limited thereto. The configuration of the first detection mode M1 and the second detection mode M2 ​​can be appropriately changed. For example, the display device 1A may repeatedly execute the detection of the second detection mode M2 ​​at predetermined intervals, and when the approach or contact of a finger (Fin) is detected, the detection is transferred to the detection of the first detection mode M1 to detect the biological information.

[0123] Third embodiment

[0124] Fig.13 2 is a cross-sectional view showing a display device according to a third embodiment. Fig.13 As shown, in the display device 1B of the third embodiment, a condenser lens 81 is provided on the upper side of the second light emitting element 5IR. More specifically, the condenser lens 81 is provided in a region overlapping with the cathode terminal 53-IR of the second light emitting element 5IR on the upper side of the cathode electrode 22 and the black component 23, and is provided to cover the first opening OP1 of the cathode electrode 22 and the second opening OP2 of the black component 23. The lower surface of the condenser lens 81 is in contact with the black component 23, the cathode electrode 22-IR, and the cathode terminal 53-IR at the peripheral portion of the second opening OP2. The adhesive layer 85 covers the condenser lens 81 and is provided on the cathode electrode 22-IR and the black component 23.

[0125] The second light emitted from the second light emitting element 5IR-L for the light source travels toward the display surface through the condenser lens 81. Thus, the diffusion of the second light emitted from the second light emitting element 5IR-L for the light source can be suppressed, and the intensity of the second light in the third direction Dz can be increased. As a result, in the second detection mode M2, the second light emitting element 5IR-L for the light source can well irradiate the second light to the finger (Fin) at the separated position.

[0126] In addition, a structure 82 is provided in a region above the first light emitting element 5VL and not overlapping with the first light emitting element 5VL. The structure 82 is provided on the black component 23 in a region not overlapping with the second opening OP2. The height of the structure 82 is the same as the height of the condenser lens 81. In one pixel group Pix, the height difference between the region where the second light emitting element 5IR is provided and the region where the pixel 20 where the first light emitting element 5VL is provided can be suppressed. Thus, by providing the structure 82, the step formed by the condenser lens 81, the cathode electrode 22, and the black component 23 can be alleviated.

[0127] In addition, the structure 82 may be formed of a black member such as a resin material colored in black. In this case, among the first lights emitted from each first light emitting element 5VL, the first light emitted in an oblique direction is absorbed by the structure 82. Thus, the display device 1B can suppress color mixing of the light of each pixel 20, and can suppress degradation of the quality of the displayed image.

[0128] The structure 82 is not particularly limited in shape, number, or arrangement when viewed from above as long as it can alleviate the step formed by the condenser lens 81. A plurality of structures 82 may be arranged for each pixel 20, or a wall-like structure 82 may be arranged to surround the pixel 20.

[0129] Fourth embodiment

[0130] Fig.14 4 is a cross-sectional view showing a display device according to a fourth embodiment. Fig.14 As shown, the display device 1C of the fourth embodiment further includes a second detection device 6. The second detection device 6 is bonded to the cathode electrode 22 and the black component 23 via an adhesive layer 85. In addition, a circular polarizing plate 7 is bonded to the second detection device 6 via an adhesive layer 86. That is, the second detection device 6 is disposed on the upper side of the first light-emitting element 5VL and the second light-emitting element 5IR, and in the third direction Dz, the array substrate 2, the first light-emitting element 5VL and the second light-emitting element 5IR, the second detection device 6, and the circular polarizing plate 7 are stacked in this order.

[0131] The second detection device 6 is, for example, a touch panel of an electrostatic capacitance type having a plurality of electrodes. Alternatively, the second detection device 6 may also be, for example, a film with a touch sensor. The second detection device 6 has a sensor substrate 60, a plurality of electrodes (a plurality of drive electrodes Tx and a plurality of detection electrodes Rx), and insulating films 61 and 62. In the third direction Dz, the sensor substrate 60, the drive electrode Tx, the insulating film 61, the detection electrode Rx, and the insulating film 62 are sequentially stacked.

[0132] The sensor substrate 60 is a light-transmitting substrate capable of transmitting visible light, such as a glass substrate. Alternatively, the sensor substrate 60 may be a light-transmitting resin substrate or resin film made of a resin such as polyimide. The second detection device 6 is a light-transmitting sensor.

[0133] The driving electrode Tx is a light-transmitting conductor such as ITO, and is disposed in the display area AA. The driving electrode Tx is connected to a terminal portion of the display device 1C via a wiring TXL provided in the peripheral area GA. The driving electrode Tx is supplied with a second driving signal via the terminal portion.

[0134] The detection electrode Rx is composed of, for example, a metal thin wire. The detection electrode Rx is arranged to cross the drive electrode Tx when viewed from above. The detection electrode Rx is connected to the terminal portion of the display device 1C via other wirings arranged in a layer different from the wiring TXL. In addition, the drive electrode Tx and the detection electrode Rx can be composed of a light-transmitting conductor such as ITO, and the drive electrode Tx and the detection electrode Rx can also be composed of a metal thin wire. In addition, the drive electrode Tx and the detection electrode Rx can also be configured to include a black conductor. In this case, the drive electrode Tx and the detection electrode Rx can suppress reflection of external light.

[0135] The detection electrode Rx of the second detection device 6 outputs a second detection signal that changes as an external object such as a finger (Fin) approaches or contacts, based on the second drive signal supplied to the drive electrode Tx. In addition, the second detection device 6 is not limited to mutual capacitance touch detection. The second detection device 6 can also perform self-capacitance touch detection. In this case, the second detection device 6 has a detection electrode Sx instead of the drive electrode Tx and the detection electrode Rx, supplies a second drive signal to the detection electrode Sx, and outputs a second detection signal from the detection electrode Sx. In other words, the detection electrode Sx has the functions of both the drive electrode Tx and the detection electrode Rx. In addition, the detection electrode Sx is, for example, an electrode configured in a matrix shape, formed of a light-transmitting conductor or a metal material.

[0136] The detection electrode Rx and the drive electrode Tx are arranged at a position that does not overlap with the second light emitting element 5IR. The second light emitting element 5IR is arranged at a position that overlaps with the third opening OP3 arranged on the drive electrode Tx. Thus, compared with the case where the detection electrode Rx and the drive electrode Tx are arranged on the second light emitting element 5IR, the reduction in the intensity of the second light in the infrared light region emitted from the second light emitting element 5IR can be suppressed. In addition, the second light in the infrared light region emitted from the second light emitting element 5IR can be suppressed from being reflected by the detection electrode Rx and returned to the array substrate 2 side.

[0137] In addition, the detection electrode Rx and the driving electrode Tx are preferably arranged at a position that does not overlap with the first light emitting element 5VL. In this case, it is possible to suppress the decrease in the intensity of the first light in the visible light region emitted from the first light emitting element 5VL and the reflection at the detection electrode Rx. Thus, the display device 1C can suppress the decrease in the quality of the displayed image.

[0138] Fifth embodiment

[0139] Fig.15 FIG. 4 is a top view showing a plurality of pixel groups of a display device according to the fifth embodiment. Fig.15 As shown, the display device 1D of the fifth embodiment has a plurality of photoelectric conversion elements PD. The plurality of photoelectric conversion elements PD output signals corresponding to the second light in the infrared light region respectively irradiated. The plurality of photoelectric conversion elements PD are, for example, Si photodiodes or CMOS image sensors. The plurality of photoelectric conversion elements PD are, for example, Figure 6 The pixel circuit PIC-IRS shown is driven by the same circuit as that shown, and outputs a signal corresponding to the second light to the detection circuit 56 .

[0140] In the present embodiment, the second light emitting elements 5IR are all driven by forward bias and operate as the second light emitting elements 5IR-L used as light sources. Among the plurality of pixel groups Pix, the pixel groups Pix-1, Pix-3, Pix-5, Pix-7, and Pix-9 have the second light emitting elements 5IR. In addition, among the plurality of pixel groups Pix, the pixel groups Pix-2, Pix-4, Pix-6, and Pix-8 have the photoelectric conversion elements PD. That is, the second light emitting elements 5IR and the photoelectric conversion elements PD are alternately arranged in the first direction Dx and the second direction Dy.

[0141] In this embodiment, in addition to the first light emitting element 5VL, the second light emitting element 5IR and the photoelectric conversion element PD are provided. Therefore, the display device 1D can suppress the degradation of the display image quality caused by the first light emitting element 5VL, and can detect biological information and hovering well through the second light emitting element 5IR and the photoelectric conversion element PD.

[0142] In addition, the configuration of the second light emitting element 5IR and the photoelectric conversion element PD is not limited to Fig.15 In the example shown, a plurality of photoelectric conversion elements PD may be provided for one second light emitting element 5IR, or a plurality of second light emitting elements 5IR may be provided for one photoelectric conversion element PD.

[0143] In addition, the photoelectric conversion element PD is not limited to the same structure as the second light-emitting element 5IR, which is set on the array substrate 2. The photoelectric conversion element PD can be set on another substrate different from the array substrate 2, or can be configured in a layer different from the second light-emitting element 5IR. For example, the photoelectric conversion element PD is set on the lower side of the substrate 10 of the display device 1D, and receives the second light reflected by the finger (Fin) and transmitted through the display device 1D. In addition, the photoelectric conversion element PD is not limited to an element having light sensitivity in the infrared light region, and can also have light sensitivity in the visible light region.

[0144] In the above description, in the parts marked as anode terminal 52 and cathode terminal 53, the connection direction of the light emitting element 5 and the direction of voltage application are not limited to those described in the specification, and may be reversed. Figure 7 , Fig.13 and Fig.14 , a structure in which one electrode of the light emitting element 5 is located at the lower side and the other electrode is located at the upper side is shown, but it may also be a structure in which both electrodes are located at the lower side, that is, the side opposite to the array substrate 2. That is, in the display device 1, it is not limited to the face-up structure in which the upper part of the light emitting element 5 is connected to the cathode electrode 22, and it may also be a so-called face-down structure in which the lower part of the light emitting element 5 is connected to the anode electrode 21 and the cathode electrode 22.

[0145] The preferred embodiments of the present invention have been described above, but the present invention is not limited to such embodiments. The content disclosed in the embodiments is only an example, and various changes can be made without departing from the scope of the present invention. Appropriate changes made within the scope of the present invention certainly also belong to the technical scope of the present invention. Without departing from the scope of the above-mentioned embodiments and the subject matter of each modification, at least one of the various omissions, substitutions and changes of the constituent elements can be made.

[0146] Description of Reference Numerals

[0147] 1, 1A, 1B, 1C, 1D…display device; 2…array substrate; 5…light-emitting element; 5VL, 5VL-R, 5VL-G, 5VL-B…first light-emitting element; 5IR…second light-emitting element; 5IR-L…second light-emitting element for light source; 5IR-S…second light-emitting element for detection; 6…second detection device; 7…circular polarizer; 10…substrate; 12…drive circuit; 20…pixel; 21, 21-VL, 21-IRL, 21-IRS…anode electrode; 22, 22-VL, 22-IRL, 22-IRS…cathode electrode; 23…black component; 51…semiconductor Body layer; 52, 52-VL, 52-IRL, 52-IRS…anode terminal; 53, 53-VL, 53-IRL, 53-IRS…cathode terminal; 60…sensor substrate; 81…condensing lens; 82…structure; L1-VL, L1-IRL, L1-IRS…anode power line; L10-VL, L10-IRL, L10-IRS…cathode power line; OP1…first opening; OP2…second opening; Pix…pixel group; Rx…detection electrode; SW1…first switching element; SW2…second switching element; Tx…driving electrode; PD…photoelectric conversion element.

Claims

1. A display device comprising: substrate; A plurality of pixels are disposed on the substrate; as well as A plurality of first inorganic light emitting elements and a plurality of second inorganic light emitting elements are provided in each of the plurality of pixels. The first inorganic light emitting element emits first light in the visible light region. The second inorganic light emitting element emits second light in the infrared light region. The first inorganic light emitting element and the second inorganic light emitting element respectively have an anode terminal and a cathode terminal, The display device comprises: a first power line for supplying a first potential to the second inorganic light emitting element; a second power supply line for supplying a second potential having a potential lower than the first potential to the second inorganic light emitting element; An element insulating film, disposed between the plurality of the first inorganic light emitting elements and the plurality of the second inorganic light emitting elements, and covering at least side surfaces of the plurality of the first inorganic light emitting elements and the plurality of the second inorganic light emitting elements; as well as a cathode electrode, which is provided to cover the plurality of the first inorganic light emitting elements, the plurality of the second inorganic light emitting elements and the element insulating film, and is connected to the plurality of the first inorganic light emitting elements and the plurality of the second inorganic light emitting elements, The cathode electrode is provided with a first opening in a region overlapping with the plurality of the second inorganic light emitting elements.

2. The display device according to claim 1, wherein: A black component is provided on the cathode electrode, The black member has a second opening in a region overlapping the first opening.

3. The display device according to claim 2, wherein: When viewed from above in a direction perpendicular to the substrate, an area of ​​the second opening is larger than an area of ​​the first opening.

4. The display device according to claim 1, wherein: A condenser lens is provided on the upper side of the second inorganic light emitting element.

5. A display device comprising: substrate; A plurality of pixels are disposed on the substrate; as well as A plurality of first inorganic light emitting elements and a plurality of second inorganic light emitting elements are provided in each of the plurality of pixels. The first inorganic light emitting element emits first light in the visible light region. The second inorganic light emitting element emits second light in the infrared light region. The first inorganic light emitting element and the second inorganic light emitting element respectively have an anode terminal and a cathode terminal, The display device comprises: a first power line for supplying a first potential to the second inorganic light emitting element; as well as a second power supply line for supplying a second potential lower than the first potential to the second inorganic light emitting element; A condenser lens is provided on the upper side of the second inorganic light emitting element.

6. The display device according to claim 5, wherein: The condenser lens is disposed on the upper side of the cathode electrode connected to the plurality of the first inorganic light emitting elements and the plurality of the second inorganic light emitting elements. A structure having the same height as the condenser lens is provided in a region above the first inorganic light emitting element and not overlapping with the first inorganic light emitting element.

7. The display device according to claim 5, wherein: The display device includes an electrostatic capacitance detection device, the detection device is provided on the upper side of the plurality of the first inorganic light emitting elements and the plurality of the second inorganic light emitting elements and includes a plurality of electrodes. The plurality of electrodes are provided in a region not overlapping with the second inorganic light emitting element.

8. A display device comprising: substrate; A plurality of pixels are disposed on the substrate; as well as A plurality of first inorganic light emitting elements and a plurality of second inorganic light emitting elements are provided in each of the plurality of pixels. The first inorganic light emitting element emits first light in the visible light region. The second inorganic light emitting element emits second light in the infrared light region. The first inorganic light emitting element and the second inorganic light emitting element respectively have an anode terminal and a cathode terminal, The display device comprises: a first power line for supplying a first potential to the second inorganic light emitting element; a second power supply line for supplying a second potential having a potential lower than the first potential to the second inorganic light emitting element; as well as An electrostatic capacitance detection device is provided on the upper side of the plurality of the first inorganic light emitting elements and the plurality of the second inorganic light emitting elements and has a plurality of electrodes, wherein the plurality of the electrodes are provided in a region that does not overlap with the second inorganic light emitting elements.

9. A display device comprising: substrate; A plurality of pixels are disposed on the substrate; as well as A plurality of first inorganic light emitting elements and a plurality of second inorganic light emitting elements are provided in each of the plurality of pixels. The first inorganic light emitting element emits first light in the visible light region. The second inorganic light emitting element emits second light in the infrared light region. The first inorganic light emitting element and the second inorganic light emitting element respectively have an anode terminal and a cathode terminal, The display device also has: a first power line for supplying a first potential to the second inorganic light emitting element; a second power supply line for supplying a second potential having a potential lower than the first potential to the second inorganic light emitting element; as well as The plurality of photoelectric conversion elements output signals corresponding to the irradiated second light.

10. A display device comprising: substrate; A plurality of pixels are disposed on the substrate; as well as A plurality of first inorganic light emitting elements and a plurality of second inorganic light emitting elements are provided in each of the plurality of pixels. The plurality of pixels include a first pixel and a second pixel adjacent to the first pixel, wherein the first pixel has the first inorganic light emitting element that emits first light in a visible light region and a second inorganic light emitting element that is driven by a forward bias and emits second light in an infrared light region as a light source, The second pixel includes the first inorganic light emitting element for emitting the first light in the visible light region and a second inorganic light emitting element for detecting the second light in the infrared light region which is driven by reverse bias. The display device comprises: An element insulating film is provided between the plurality of the first inorganic light emitting elements and the plurality of the second inorganic light emitting elements, and covers at least side surfaces of the plurality of the first inorganic light emitting elements and the plurality of the second inorganic light emitting elements; as well as a cathode electrode, which is provided to cover the plurality of the first inorganic light emitting elements, the plurality of the second inorganic light emitting elements and the element insulating film, and is connected to the plurality of the first inorganic light emitting elements and the plurality of the second inorganic light emitting elements, The cathode electrode is provided with a first opening in a region overlapping with the plurality of the second inorganic light emitting elements.

11. The display device according to claim 10, wherein: The first pixel does not have a second inorganic light emitting element driven by a reverse bias, The second pixel does not have a second inorganic light emitting element driven in a forward bias.

12. The display device according to claim 10, wherein: The first inorganic light emitting element and the second inorganic light emitting element respectively have an anode terminal and a cathode terminal, Among the plurality of the second inorganic light emitting elements, the first potential is supplied to the anode terminal of the second inorganic light emitting element used as the light source for emitting the second light, A second potential lower than the first potential is supplied to the cathode terminal of the second inorganic light emitting element for the light source.

13. The display device according to claim 12, wherein: supplying the second potential to the anode terminal of the second inorganic light emitting element for detection that outputs a signal corresponding to the irradiated second light among the plurality of second inorganic light emitting elements, The first potential is supplied to the cathode terminal of the second inorganic light emitting element for detection.

14. The display device according to claim 10, wherein: The display device includes a detection circuit that detects a signal outputted in response to light irradiated onto the second inorganic light-emitting element for detection.

15. The display device according to claim 10, wherein: A condenser lens is provided on the upper side of the second inorganic light emitting element.

16. A display device comprising: substrate; A plurality of pixels are disposed on the substrate; as well as A plurality of first inorganic light emitting elements and a plurality of second inorganic light emitting elements are provided in each of the plurality of pixels. The plurality of pixels include a first pixel and a second pixel adjacent to the first pixel, wherein the first pixel has the first inorganic light emitting element that emits first light in a visible light region and a second inorganic light emitting element that is driven by a forward bias and emits second light in an infrared light region as a light source, The second pixel includes the first inorganic light emitting element for emitting the first light in the visible light region and a second inorganic light emitting element for detecting the second light in the infrared light region which is driven by reverse bias. The first pixel does not have a second inorganic light emitting element driven by a reverse bias, The second pixel does not have a second inorganic light emitting element driven by a forward bias, A focusing lens is provided on the upper side of the second inorganic light emitting element. The condenser lens is disposed on the upper side of the cathode electrode connected to the plurality of the first inorganic light emitting elements and the plurality of the second inorganic light emitting elements. A structure having the same height as the condenser lens is provided in a region above the first inorganic light emitting element and not overlapping with the first inorganic light emitting element.

17. The display device according to claim 16, wherein: The display device includes an electrostatic capacitance detection device, the detection device is provided on the upper side of the plurality of the first inorganic light emitting elements and the plurality of the second inorganic light emitting elements and includes a plurality of electrodes. The plurality of electrodes are provided in a region not overlapping with the second inorganic light emitting element.

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