Display device, method for manufacturing display device, and light-emitting element

Abstract

A display device according to one embodiment of the present disclosure comprises: a light-emitting unit that emits visible light; a photoelectric conversion unit that is disposed at a position facing the light-emitting unit and that converts light into electricity; and a functional layer that is disposed between the light-emitting unit and the photoelectric conversion unit, that reflects the visible light, and that transmits light which is in a prescribed wavelength range and which is other than the visible light.

Description

Display device, display device manufacturing method and light-emitting element

[0001] The present disclosure relates to a display device, a method for manufacturing a display device, and a light-emitting element.

[0002] In recent years, display devices in which OLEDs (organic light-emitting diodes) and PDs (photodiodes) are stacked have been developed (see, for example, Patent Document 1). In these display devices, a transparent electrode is used as the electrode (lower electrode) below the OLED in order to extract light to the PD side located below the OLED.

[0003] JP 2009-238833 A

[0004] However, in the above-mentioned display device, a transparent electrode is used as the electrode below the OLED, instead of a reflective electrode, which reduces the light extraction efficiency of the upper layer (display side) of the OLED, resulting in reduced brightness.

[0005] Therefore, the present disclosure proposes a display device capable of achieving high brightness, a method for manufacturing the display device, and a light-emitting element.

[0006] A display device according to one embodiment of the present disclosure includes a light-emitting unit that emits visible light, a photoelectric conversion unit that is disposed opposite the light-emitting unit and converts light into electricity, and a functional layer that is disposed between the light-emitting unit and the photoelectric conversion unit and that reflects the visible light and transmits light in a predetermined wavelength range other than the visible light.

[0007] A method for manufacturing a display device according to one embodiment of the present disclosure includes providing a functional layer between a light-emitting section that emits visible light and a photoelectric conversion section that converts light into electricity, the functional layer reflecting the visible light and transmitting light in a predetermined wavelength range other than the visible light.

[0008] A light-emitting element according to one embodiment of the present disclosure comprises a light-emitting section that emits visible light, a photoelectric conversion section that is disposed opposite the light-emitting section and converts light into electricity, and a functional layer that is disposed between the light-emitting section and the photoelectric conversion section and that reflects the visible light and transmits light in a predetermined wavelength range other than the visible light.

[0009] 1 is a diagram illustrating an example of the configuration of a display device according to a first embodiment; FIG. 2 is a diagram illustrating an example of the configuration of a circuit of a light-emitting element according to the first embodiment; FIG. 3 is a diagram illustrating an example of the configuration of a detailed structure of the display device according to the first embodiment; FIG. 4 is a cross-sectional view illustrating an example of the configuration of a detailed structure of the display device according to the first embodiment; FIG. 5 is a diagram illustrating an example of the spectral characteristics of a cold mirror according to the first embodiment; FIG. 6 is a diagram illustrating a flow of a manufacturing process of the display device according to the first embodiment; FIG. 7 is a cross-sectional view illustrating an example of the configuration of a detailed structure of the display device according to the second embodiment; FIG. 8 is a cross-sectional view illustrating an example of the configuration of a detailed structure of the display device according to the third embodiment; FIG. 9 is a cross-sectional view illustrating an example of the configuration of a detailed structure of the display device according to the fourth embodiment; FIG. 10 is a cross-sectional view illustrating an example of the configuration of a detailed structure of the display device according to the tenth embodiment; FIG. 11 is a cross-sectional view illustrating a stripe arrangement of pixels; FIG. 12 is a cross-sectional view illustrating a delta arrangement of pixels; FIG. 13 is a cross-sectional view illustrating a square arrangement of pixels. FIG. 1 is a diagram for explaining eye tracking applications. FIG. 2 is a diagram illustrating an example of the appearance of a smartphone. FIG. 3 is a diagram illustrating an example of the appearance of a digital still camera. FIG. 4 is a diagram illustrating an example of the appearance of a digital still camera. FIG. 5 is a diagram illustrating an example of the appearance of a head-mounted display. FIG. 6 is a diagram illustrating an example of the appearance of a see-through head-mounted display. FIG. 7 is a diagram illustrating an example of the appearance of a television device. FIG. 8 is a diagram illustrating an example of the internal configuration of a vehicle. FIG. 9 is a diagram illustrating an example of the internal configuration of a vehicle.

[0010] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The embodiments include examples and modified examples. Note that the embodiments do not limit the devices, equipment, methods, elements, etc. according to the present disclosure. Furthermore, in the following embodiments, essentially identical components are designated by the same reference numerals, and redundant explanations will be omitted.

[0011] The present disclosure will be described in the following order: 1. First Embodiment 1-1. Configuration Example of a Display Device 1-2. Configuration Example of a Circuit of a Light-Emitting Element 1-3. Configuration Example of a Detailed Structure of a Display Device 1-4. Example of a Functional Layer 1-5. Example of a Process in a Manufacturing Method of a Display Device 2. Second Embodiment 2-1. Configuration Example of a Detailed Structure of a Display Device 3. Third Embodiment 3-1. Configuration Example of a Detailed Structure of a Display Device 4. Fourth Embodiment 4-1. Configuration Example of a Detailed Structure of a Display Device 5. Fifth Embodiment 5-1. Configuration Example of a Detailed Structure of a Display Device 6. Sixth Embodiment 6-1. Configuration Example of a Detailed Structure of a Display Device 7. Seventh Embodiment 7-1. Configuration Example of a Detailed Structure of a Display Device 8. Eighth Embodiment 8-1. Configuration Example of a Detailed Structure of a Display Device 9. Ninth Embodiment 9-1. Configuration Example of a Detailed Structure of a Display Device 10. Tenth Embodiment 10-1. Configuration Example of a Detailed Structure of a Display Device 11. Eleventh Embodiment 11-1. Configuration Example of a Detailed Structure of a Display Device 12. 13. Functions and Effects of Each Embodiment 14. Example of Pixel Arrangement 15. Example of Use 16. Example of Application 17. Supplementary Notes

[0012] <1. First embodiment> <1-1. Configuration example of display device> A configuration example of a display device 1 according to this embodiment will be described with reference to Fig. 1. Fig. 1 is a diagram showing a configuration example of a display device 1 according to this embodiment.

[0013] As shown in Fig. 1, the display device 1 according to this embodiment includes a plurality of light-emitting elements 100, a horizontal drive circuit 11, and a vertical drive circuit 12. The light-emitting elements 100 are arranged, for example, in a matrix. The horizontal drive circuit 11 and the vertical drive circuit 12 are circuits for driving the light-emitting elements 100, respectively. In the example of Fig. 1, the horizontal drive circuit 11 and the vertical drive circuit 12 are each arranged on an end side of the display device 1, but their arrangement is not particularly limited.

[0014] The display device 1 includes a plurality of scanning lines SCL, a plurality of signal lines DTL, and a plurality of power supply lines (not shown). Each of the scanning lines SCL is a line for scanning the light-emitting elements 100. Each of the signal lines DTL is a line for supplying various voltages to the light-emitting elements 100. Each of the power supply lines is a line for supplying a drive voltage to the light-emitting elements 100.

[0015] The light-emitting elements 100 are arranged in a matrix, for example, M in the horizontal direction (X-axis direction in FIG. 1 ) and N in the vertical direction (Y-axis direction in FIG. 1 ), for a total of M×N elements. One light-emitting element 100 may function as one pixel, or one light-emitting element 100 may function as a sub-pixel, and a set of multiple sub-pixels may function as one pixel.

[0016] The display device 1 is a display device capable of color display. In the example of Fig. 1, the light emitting element 100 that emits red light (R: wavelength 620 nm to 750 nm) is assigned the symbol R, the light emitting element 100 that emits green light (G: wavelength 495 nm to 570 nm) is assigned the symbol G, and the light emitting element 100 that emits blue light (B: wavelength 450 nm to 495 nm) is assigned the symbol B.

[0017] Examples of the display device 1 include various displays for televisions, personal computers, VR (Virtual Reality), MR (Mixed Reality), AR (Augmented Reality), etc., as well as EVFs (Electronic View Finders), small projectors, etc. The display device 1 is an example of a light-emitting device.

[0018] <1-2. Example of circuit configuration of light-emitting element> An example of the circuit configuration of the light-emitting element 100 according to this embodiment will be described with reference to Fig. 2. Fig. 2 is a diagram showing an example of the circuit configuration of the light-emitting element 100 according to this embodiment. In the example of Fig. 2, the wiring relationship for one light-emitting element 100 is shown.

[0019] As shown in FIG. 2, the light emitting element 100 includes a light emitting unit 101 and a drive circuit 102. The light emitting unit 101 is, for example, a current-driven light emitting unit. The drive circuit 102 is a circuit that controls the light emission of the light emitting unit 101. The drive circuit 102 includes, for example, a write transistor TR Ｗ and drive transistor TR Ｄ , capacitance part C Ｓ Includes:

[0020] Write transistor TR Ｗ is a transistor for writing a video signal. Ｄ is a transistor that passes a current to the light emitting portion 101. Ｗ and the driving transistor TR Ｄ is composed of, for example, a p-channel transistor.

[0021] Capacity part C Ｓ is the driving transistor TR Ｄ When the light emitting element 100 emits light, the gate electrode of the driving transistor TR Ｄ One of the source / drain regions (the side connected to the power supply line PS1 in FIG. 2) serves as a source region, and the other source / drain region serves as a drain region.

[0022] This capacitance part C Ｓ is the driving transistor TR Ｄ and the source / drain region of the driving transistor TR Ｄ The driving transistor TR is connected between the gate electrode of the driving transistor TR Ｄ The other source / drain region is connected to the anode electrode of the light emitting portion 101 .

[0023] The light-emitting unit 101 is configured, for example, by an organic electroluminescence element (organic EL element) such as an OLED (organic light-emitting diode). This light-emitting unit 101 is, for example, a current-driven light-emitting unit whose light-emitting brightness changes according to the current value. For example, the light-emitting unit 101 has a well-known configuration and structure including an anode electrode, a hole transport layer, a light-emitting layer, an electron transport layer, a cathode electrode, etc.

[0024] The other end of the light-emitting unit 101 (specifically, the cathode electrode) is connected to a common power supply line PS2. A predetermined voltage V Ｃat (for example, ground potential) is supplied. The capacitance of the light emitting unit 101 is denoted by the symbol C ＥＬ The capacitance C of the light emitting unit 101 is expressed as follows: ＥＬ If the small capacitance causes problems in driving the light-emitting unit 101, an auxiliary capacitance may be connected in parallel to the light-emitting unit 101 as necessary.

[0025] Write transistor TR Ｗ , a gate electrode connected to a scanning line SCL, one source / drain region connected to a signal line (data line) DTL, and a driving transistor TR Ｄ The signal voltage from the signal line DTL is applied to the write transistor TR Ｗ via the capacitance section C Ｓ is written to.

[0026] Power supply voltage V ＣＣ is supplied from a power supply unit (not shown) through a power supply line PS1 to the driving transistor TR Ｄ The video signal voltage V from the signal line DTL is applied to one of the source / drain regions. Ｓｉｇ is the write transistor TR Ｗ via the capacitance section C Ｓ When written to the capacitor C Ｓ is (V ＣＣ -V Ｓｉｇ ) to the driving transistor TR Ｄ The gate-source voltage of the driving transistor TR is maintained as Ｄ The drain current I ｄｓflows, and the light emitting unit 101 emits light at a brightness according to the current value.

[0027] I ｄｓ = k μ ((V ＣＣ -V Ｓｉｇ )-|V ｔｈ |) ２ (1) where μ is the effective mobility, L is the channel length, W is the channel width, and V ｔｈ : threshold voltage, C ｏｘ : (relative permittivity of gate insulating layer) × (dielectric constant of vacuum) / (thickness of gate insulating layer), k≡(½) × (W / L) × C ｏｘ Let's say.

[0028] <1-3. Configuration example of detailed structure of display device> A configuration example of the detailed structure of the display device 1 according to this embodiment will be described with reference to Fig. 3 and Fig. 4. Each of Fig. 3 and Fig. 4 is a diagram for explaining a configuration example of the detailed structure of the display device 1 according to this embodiment. In the example of Fig. 4, a cross-sectional view of the detailed structure of the display device 1 is shown.

[0029] 3 and 4 , the display device 1 includes a display panel 20 and a detection panel 30. The display panel 20 displays various images. The detection panel 30 detects light (for example, the movement of a person's eye 2). That is, the display panel 20 functions as a display unit, and the detection panel 30 functions as a detection unit. The display panel 20 and the detection panel 30 are stacked and correspond to a pixel array unit including the above-mentioned light-emitting elements 100.

[0030] The display device 1 realizes both image display and gaze detection (e.g., eye tracking) in a single device. In the example of Fig. 3, an image (e.g., visible light L1) displayed by the display device 1 is seen by a human eye (eyeball) 2 via an optical system 3. Furthermore, light (e.g., infrared light L2) reflected by the eye 2 is detected by a detection panel 30, and the movement of the human eye 2 (e.g., gaze) is detected from the detection result.

[0031] 4 , the display panel 20 has a plurality of electrodes 21, a plurality of electrode edge films 22, a plurality of organic layers 23, an electrode layer 24, and a protective layer 25. The detection panel 30 has a substrate 31, an insulating layer 32, a plurality of photoelectric conversion units 33, and a plurality of functional layers 34. The light-emitting unit 101 described above is configured such that the organic layer 23 is sandwiched between the electrodes 21 and the electrode layer 24.

[0032] The electrode 21 is provided on the detection panel 30 for each light-emitting element 100. The electrode 21 is formed, for example, from a material that is optically transparent and conductive (for example, a transparent material that is conductive). As an example, the electrode 21 is formed from a transparent electrode that transmits light. As a material for the electrode 21, for example, indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), or the like may be used. The electrode 21 functions, for example, as an anode.

[0033] The electrode edge film 22 is an insulating film. This electrode edge film 22 is provided between the individual edges of adjacent electrodes 21. This electrically isolates each of the adjacent electrodes 21. Furthermore, the portions of the electrodes 21 covered with the electrode edge film 22 are also electrically isolated from the organic layer 23, suppressing light emission from the organic layer 23 corresponding to these portions.

[0034] The organic layer 23 is provided on each electrode 21 and each electrode edge film 22. This organic layer 23 includes at least a light-emitting layer and is configured to emit, for example, blue (B), red (R), or green (G). Note that in the example of FIG. 4, the organic layer 23 is shown as a single layer, but in reality it is configured of multiple layers including the light-emitting layer. For example, the organic layer 23 may have a structure in which, from the electrode 21 side, a hole injection layer, a hole transport layer, a light-emitting layer, and an electron transport layer are stacked.

[0035] The electrode layer 24 is provided on the organic layer 23. This electrode layer 24 is provided in common to each light-emitting section 101 (each light-emitting element 100) and is shared by each light-emitting section 101. The electrode layer 24 is formed, for example, from a material that is optically transparent and conductive (for example, a transparent material that is conductive). As an example, the electrode layer 24 is formed from a transparent electrode layer that transmits light. Examples of materials that may be used for the electrode layer 24 include indium tin oxide (ITO), indium zinc oxide (IZO), and zinc oxide (ZnO). The electrode layer 24 functions, for example, as a cathode.

[0036] The protective layer 25 is provided on the electrode layer 24. This protective layer 25 is a film that protects each internal layer from external contamination. The protective layer 25 is formed, for example, from a light-transmitting material (e.g., a transparent material). Examples of materials that can be used for the protective layer 25 include organic insulating films such as polyimide resins, acrylic resins, and novolac resins, inorganic insulating films such as silicon nitride (SiN), silicon oxynitride (SiON), silicon oxide (SiO), and aluminum oxide (AlO), and stacked films of these various insulating films. Note that, because organic insulating films are more permeable to moisture than inorganic insulating films, it is preferable to use an inorganic insulating film (inorganic insulating layer) as the protective layer 25.

[0037] The substrate 31 includes various wirings 31a (e.g., multi-layer wiring layers, transistors, etc.). The substrate 31 functions as a support for supporting the light-emitting elements 100, etc. In addition to the various wirings 31a, the substrate 31 may also include, for example, drive circuits 102 for the light-emitting elements 100 and other circuits (e.g., detection circuits that receive electrical signals from the photoelectric conversion units 33, power supply circuits that supply power to the light-emitting units 101), etc. The substrate 31 may be, for example, a semiconductor substrate, a glass substrate, a resin substrate, etc.

[0038] The insulating layer 32 is provided on the substrate 31. The insulating layer 32 may be made of an insulating material such as silicon nitride (SiN), silicon oxynitride (SiON), or silicon oxide (SiO).

[0039] A plurality of contact plugs 32a are formed in the insulating layer 32. One contact plug 32a is provided for each light-emitting element 100 (light-emitting portion 101), i.e., for each electrode 21, and each contact plug 32a is connected to each electrode 21 in a one-to-one relationship. Each contact plug 32a is formed to penetrate the insulating layer 32 in the Z-axis direction in FIG. 4. For example, the wiring 31a and the drive circuit 102 are connected to the electrode 21 via the contact plug 32a.

[0040] The photoelectric conversion unit 33 is provided in the insulating layer 32 for each light-emitting element 100 at a position facing and spaced apart from the light-emitting unit 101. These photoelectric conversion units 33 are spaced apart and do not contact each other in the X-axis direction in FIG. 4. The photoelectric conversion units 33 convert light into electricity. For example, a photodiode (PD) may be used as the photoelectric conversion unit 33. The photoelectric conversion unit 33 is electrically connected to a detection circuit or the like via wiring 31 a of the substrate 31, for example.

[0041] The functional layer 34 is provided within the insulating layer 32 for each light-emitting element 100, between the electrode 21 and the photoelectric conversion unit 33. That is, the functional layer 34 is provided between the light-emitting unit 101 and the photoelectric conversion unit 33. The functional layer 34 is provided directly below the light-emitting unit 101 so as to be in contact with the light-emitting unit 101 (electrode 21). The functional layers 34 are spaced apart and do not contact each other in the X-axis direction in FIG. 4. The functional layers 34 reflect visible light (visible rays) L1 and transmit infrared light (infrared rays) L2. The infrared light L2 is, for example, an electromagnetic wave with a wavelength longer than that of red visible light and shorter than that of radio waves.

[0042] In this display device 1, visible light L1 emitted from the organic layer 23 of the light-emitting unit 101 is emitted from the electrode layer 24 side, but a portion of the visible light L1 also travels toward the electrode 21 side, passes through the electrode 21, and enters the functional layer 34. The visible light L1 that enters the functional layer 34 is reflected by the functional layer 34 and exits from the electrode layer 24 side. On the other hand, infrared light L2 that enters the organic layer 23 from the electrode layer 24 side of the light-emitting unit 101 passes through the organic layer 23, the electrode 21, and the functional layer 34 and enters the photoelectric conversion unit 33. In this way, the functional layer 34 functions as a reflective layer for visible light L1 and a transmissive layer for infrared light L2. This enables high brightness image display using visible light L1 and also enables gaze detection such as eye tracking using infrared light L2.

[0043] The light transmitted through the functional layer 34 may be other than the infrared light L2, for example, ultraviolet light (ultraviolet light). In other words, the functional layer 34 is configured to reflect visible light L1 and transmit light in a predetermined wavelength range other than visible light L1 (for example, infrared light L2 or ultraviolet light) depending on whether the application is for gaze detection or other purposes.

[0044] <1-4. Example of Functional Layer> An example of the functional layer 34 according to this embodiment will be described with reference to Fig. 5. Fig. 5 is a diagram showing an example of the spectral characteristics (45° incident angle characteristics) of the cold mirror according to this embodiment. In the example of Fig. 5, graph B1 shows the change in reflectance (R), and graph B2 shows the change in transmittance (T).

[0045] The functional layer 34 may be formed, for example, of a dielectric multilayer film. The dielectric multilayer film may be, for example, a cold mirror. As shown in FIG. 5 , the cold mirror is a dielectric multilayer film mirror that reflects cold light (visible light L1) and transmits hot light (infrared light L2). For example, the cold mirror reflects 90% of visible light L1 and transmits 80% or more of infrared light L2 up to about 1100 nm. The wavelength range (wavelength region) of the visible light L1 is, for example, from about 380 nm to about 780 nm. The wavelength range of the infrared light L2 is, for example, from about 780 nm to about 1000 nm.

[0046] Such a cold mirror is constructed, for example, by vacuum-depositing two materials with different refractive indices (large and small) alternately and in multiple layers to a thickness (λ (wavelength) / 4). The cold mirror is, for example, a dielectric multilayer film in which adjacent layers have different refractive indices. The thicknesses of the layers in this multilayer may be the same or different.

[0047] Examples of materials that can be used for the vapor deposition film of the cold mirror include a combination of titanium dioxide (TiO2) and silicon dioxide (SiO2), a combination of tantalum pentoxide (Ta2O5) and silicon dioxide (SiO2), and a combination of zinc sulfide (ZnS) and magnesium fluoride (MgF2).

[0048] <1-5. Example of Processes in a Method for Manufacturing a Display Device> An example of processes in a method for manufacturing a display device 1 according to this embodiment will be described with reference to Fig. 6 to Fig. 8. Each of Fig. 6 to Fig. 8 is a diagram for explaining the manufacturing process of the display device 1 according to this embodiment. In the examples of Fig. 6 to Fig. 8, cross-sectional views illustrating a part of the manufacturing process of the display device 1 are shown.

[0049] 6, a resist layer 50 is formed on the insulating layer 32 of the detection panel 30, and etching is performed using the resist layer 50 as a mask. As a result, a plurality of recesses 34a for forming the functional layer 34 are formed on the upper surface of the insulating layer 32. Note that the resist layer 50 is patterned by photolithography or the like in order to form each recess 34a in the insulating layer 32.

[0050] 7, the material of the functional layer 34 is filled into each recess 34a of the insulating layer 32 by vapor deposition, and each functional layer 34 is formed on the insulating layer 32. For example, if the functional layer 34 is a cold mirror, it is formed as a dielectric multilayer film. Thereafter, the resist layer 50 is removed.

[0051] 8 , the display panel 20 (each electrode 21, electrode edge film 22, each organic layer 23, electrode layer 24, and protective layer 25) is laminated on the detection panel 30. This completes the display device 1. Each functional layer 34 is provided between each light-emitting unit 101 and each photoelectric conversion unit 33.

[0052] The display device 1 according to this embodiment can be manufactured using methods, devices, and conditions used in the manufacture of general semiconductor devices. That is, the display device 1 according to this embodiment can be manufactured using an existing method for manufacturing a semiconductor device.

[0053] Examples of manufacturing methods that can be used include chemical vapor deposition (CVD), atomic layer deposition (ALD), and physical vapor deposition (PVD). Examples of PVD methods include vacuum deposition, electron beam (EB) deposition, various sputtering methods, ion plating, laser ablation, molecular beam epitaxy (MBE), and laser transfer. Examples of CVD methods include plasma CVD, thermal CVD, metal organic (MO) CVD, and photo-CVD. Other methods that can be used include electrolytic plating, electroless plating, various printing methods, and various coating methods. Examples of patterning methods include chemical etching such as shadow masking, laser transfer, and photolithography, and physical etching using ultraviolet light or a laser.

[0054] <2. Second embodiment> <2-1. Configuration example of detailed structure of display device> A configuration example of the detailed structure of the display device 1 according to this embodiment will be described with reference to Fig. 9. Fig. 9 is a diagram showing a configuration example of the detailed structure of the display device 1 according to this embodiment. This embodiment is basically the same as the first embodiment (see Fig. 4), but differences therebetween will be described.

[0055] 9 , the functional layer 34 according to this embodiment is provided in common to a plurality of light-emitting elements 100, and is formed so as to be shared by those light-emitting elements 100. That is, the functional layer 34 is formed so as to be located between a plurality of light-emitting sections 101 and a plurality of photoelectric conversion sections 33. In the example of FIG. 9 , the functional layer 34 is formed so as to be shared by three light-emitting elements 100, that is, so as to be located between three light-emitting sections 101 and three photoelectric conversion sections 33.

[0056] The display device 1 having such a configuration can achieve high brightness, as in the first embodiment. Furthermore, since the functional layer 34 is shared by each light-emitting element 100, the configuration can be simplified and manufacturing can be facilitated compared to when the functional layer 34 is provided for each light-emitting element 100.

[0057] <3. Third embodiment> <3-1. Configuration example of detailed structure of display device> A configuration example of the detailed structure of the display device 1 according to this embodiment will be described with reference to Fig. 10. Fig. 10 is a diagram showing a configuration example of the detailed structure of the display device 1 according to this embodiment. This embodiment is basically the same as the second embodiment (see Fig. 9), but differences therebetween will be described.

[0058] 10 , the photoelectric conversion section 33 according to this embodiment is provided in common to a plurality of light-emitting elements 100 and is formed so as to be shared by these light-emitting elements 100. That is, the photoelectric conversion section 33 is formed so as to face the plurality of light-emitting sections 101 with one functional layer 34 interposed therebetween. The functional layer 34 is formed so as to be located between the plurality of light-emitting sections 101 and one photoelectric conversion section 33. In the example of FIG. 10 , the functional layer 34 is formed so as to be located between three light-emitting sections 101 and one photoelectric conversion section 33.

[0059] The display device 1 having such a configuration can achieve high brightness, as in the first embodiment. Furthermore, since the photoelectric conversion unit 33 and the functional layer 34 are shared by each light-emitting element 100, the configuration can be simplified and manufacturing can be facilitated compared to when the photoelectric conversion unit 33 and the functional layer 34 are provided for each light-emitting element 100.

[0060] <4. Fourth embodiment> <4-1. Configuration example of detailed structure of display device> A configuration example of the detailed structure of the display device 1 according to this embodiment will be described with reference to Fig. 11. Fig. 11 is a diagram showing a configuration example of the detailed structure of the display device 1 according to this embodiment. This embodiment is basically the same as the first embodiment (see Fig. 4), but differences therebetween will be described.

[0061] 11 , the display device 1 according to this embodiment includes a plurality of condenser lenses 35. Each condenser lens 35 is provided between each electrode 21 and each functional layer 34. That is, the condenser lens 35 is provided between the light-emitting unit 101 and the functional layer 34. The functional layer 34 is provided on the photoelectric conversion unit 33 and is in contact with the photoelectric conversion unit 33. The condenser lens 35 is provided on the functional layer 34 and is in contact with the functional layer 34.

[0062] The condenser lens 35 condenses incident light (for example, visible light L1 or infrared light L2) toward the functional layer 34 and the photoelectric conversion unit 33. Each condenser lens 35 may have the same structure or shape, and each condenser lens 35 may have a hemispherical shape. For example, a microlens can be used as the condenser lens 35.

[0063] The display device 1 having such a configuration can achieve high brightness, as in the first embodiment. Furthermore, since the condenser lens 35 can condense light to the photoelectric conversion unit 33, the light detection accuracy (for example, gaze detection accuracy) can be improved compared to a case where the condenser lens 35 is not provided.

[0064] <5. Fifth embodiment> <5-1. Configuration example of detailed structure of display device> A configuration example of the detailed structure of the display device 1 according to this embodiment will be described with reference to Fig. 12. Fig. 12 is a diagram showing a configuration example of the detailed structure of the display device 1 according to this embodiment. This embodiment is basically the same as the fourth embodiment (see Fig. 11), but differences therebetween will be described.

[0065] 12 , each of the condenser lenses 35 according to this embodiment is provided between each of the functional layers 34 and each of the photoelectric conversion units 33. That is, the condenser lens 35 is provided between the functional layer 34 and the photoelectric conversion unit 33. The condenser lens 35 condenses incident light (for example, visible light L1 or infrared light L2) toward the photoelectric conversion unit 33. The condenser lens 35 is provided on the photoelectric conversion unit 33 and is in contact with the photoelectric conversion unit 33.

[0066] The display device 1 having such a configuration can achieve high brightness, as in the first embodiment. Furthermore, as in the fourth embodiment, the condenser lens 35 can condense light to the photoelectric conversion unit 33, thereby improving the light detection accuracy (for example, gaze detection accuracy) compared to a case where the condenser lens 35 is not provided.

[0067] <6. Sixth embodiment> <6-1. Configuration example of detailed structure of display device> A configuration example of the detailed structure of the display device 1 according to this embodiment will be described with reference to Fig. 13. Fig. 13 is a diagram showing a configuration example of the detailed structure of the display device 1 according to this embodiment. This embodiment is basically the same as the first embodiment (see Fig. 4), but differences therebetween will be described.

[0068] 13 , in the display device 1 according to this embodiment, a photoelectric conversion unit 33 and a functional layer 34 are provided for only one of the blue (B), red (R), and green (G) light-emitting elements 100. In the example of FIG. 13 , a photoelectric conversion unit 33 and a functional layer 34 are provided for only the green (G) light-emitting element 100.

[0069] The electrode 21 corresponding to the green (G) light-emitting element 100 is a transparent electrode. The electrodes 21A corresponding to the blue (B) and red (R) light-emitting elements 100 are reflective electrodes that reflect light (for example, at least visible light L1, or both visible light L1 and infrared light L2). That is, in a light-emitting element 100 that does not have a photoelectric conversion unit 33 or a functional layer 34, the electrode 21A may be formed of, for example, a reflective electrode.

[0070] The material of the reflective electrode may be, for example, a metal film containing at least one of a simple substance or an alloy of a metal element such as chromium (Cr), gold (Au), platinum (Pt), nickel (Ni), copper (Cu), molybdenum (Mo), titanium (Ti), tantalum (Ta), aluminum (Al), magnesium (Mg), iron (Fe), tungsten (W), silver (Ag), etc. Specific examples of the alloy include aluminum (Al) alloys such as AlNi alloys or AlCu alloys, and silver (Ag) alloys such as MgAg alloys.

[0071] The display device 1 having such a configuration can achieve high brightness, as in the first embodiment. Moreover, since the electrode 21A of any one of the light-emitting elements 100 among the plurality of light-emitting elements 100 is a reflective electrode, higher brightness can be achieved compared to when all the electrodes 21 are transparent electrodes.

[0072] In this embodiment, the photoelectric conversion unit 33 and the functional layer 34 are provided only in one of the three light-emitting elements 100 of blue (B), red (R), and green (G), but this is not limited to this. For example, the photoelectric conversion unit 33 and the functional layer 34 may be provided only in two of the three light-emitting elements 100.

[0073] <7. Seventh embodiment> <7-1. Configuration example of detailed structure of display device> A configuration example of the detailed structure of the display device 1 according to this embodiment will be described with reference to Fig. 14. Fig. 14 is a diagram showing a configuration example of the detailed structure of the display device 1 according to this embodiment. This embodiment is basically the same as the first embodiment (see Fig. 4), but differences therebetween will be described.

[0074] 14 , the display device 1 according to this embodiment includes a plurality of color filters 26. Each color filter 26 is provided on the protective layer 25 in a position facing each light-emitting portion 101. Each light-emitting portion 101 has a common organic layer 23 and emits white (W) visible light L1. The color filters 26 include, for example, a blue (B) color filter 26, a red (R) color filter 26, and a green (G) color filter 26. In other words, the display device 1 includes a blue (B) light-emitting element 100, a red (R) light-emitting element 100, and a green (G) light-emitting element 100.

[0075] The display device 1 having such a configuration can achieve high brightness, as in the first embodiment. Furthermore, since the light-emitting units 101 having the same light-emitting color (W) are manufactured, the manufacturing of the light-emitting units 101 can be made easier than when the light-emitting units 101 having different light-emitting colors (B, R, G) are manufactured.

[0076] In this embodiment, the color filter 26 is provided on the protective layer 25, but this is not limiting. For example, the color filter 26 may be provided between the electrode layer 24 and the protective layer 25, as long as it is provided on the optical path of the light emitted from the electrode layer 24 side of the light-emitting unit 101.

[0077] <8. Eighth embodiment> <8-1. Configuration example of detailed structure of display device> A configuration example of the detailed structure of the display device 1 according to this embodiment will be described with reference to Fig. 15. Fig. 15 is a diagram showing a configuration example of the detailed structure of the display device 1 according to this embodiment. This embodiment is basically the same as the first embodiment (see Fig. 4), but differences therebetween will be described.

[0078] As shown in Fig. 15 , in the display device 1 according to this embodiment, the height positions of the functional layers 34 are different. In the example of Fig. 15 , the height positions are positions in the Z-axis direction. The Z-axis direction is the thickness direction (stacking direction) of the display device 1. Note that in the first embodiment, the height positions of the functional layers 34 are the same.

[0079] The display device 1 having such a configuration can achieve high brightness, as in the first embodiment. In addition, the degree of design freedom is increased, and by changing the height position of the functional layer 34 for each light-emitting element 100 as needed, it is possible to achieve high brightness and improved light detection accuracy (for example, gaze detection accuracy).

[0080] In this embodiment, all of the height positions of each functional layer 34 are different, but this is not limited to this. For example, of the three functional layers 34, the height positions of two of the functional layers 34 may be the same, and only the height position of one functional layer 34 may be different.

[0081] <9. Ninth embodiment> <9-1. Configuration example of detailed structure of display device> A configuration example of the detailed structure of the display device 1 according to this embodiment will be described with reference to Fig. 16. Fig. 16 is a diagram showing a configuration example of the detailed structure of the display device 1 according to this embodiment. This embodiment is basically the same as the eighth embodiment (see Fig. 15), but differences therebetween will be described.

[0082] As shown in Fig. 16 , in the display device 1 according to this embodiment, the thicknesses of the functional layers 34 are different. In the example of Fig. 16 , the thickness is the length in the Z-axis direction. In the eighth embodiment, the thicknesses of the functional layers 34 are the same.

[0083] The display device 1 having such a configuration can achieve high brightness, as in the first embodiment. In addition, the degree of design freedom is increased, and by changing the thickness of the functional layer 34 for each light-emitting element 100 as needed, it is possible to achieve high brightness and improved light detection accuracy (for example, gaze detection accuracy).

[0084] In this embodiment, the thicknesses of all of the functional layers 34 are different, but this is not limited to this. For example, of the three functional layers 34, the thicknesses of two of the functional layers 34 may be the same, and only the thickness of one functional layer 34 may be different.

[0085] <10. Tenth embodiment> <10-1. Configuration example of detailed structure of display device> A configuration example of the detailed structure of the display device 1 according to this embodiment will be described with reference to Fig. 17. Fig. 17 is a diagram showing a configuration example of the detailed structure of the display device 1 according to this embodiment. This embodiment is basically the same as the first embodiment (see Fig. 4), but differences therebetween will be described.

[0086] 17 , the display device 1 according to this embodiment includes a plurality of reflective layers 34A. Each reflective layer 34A is provided between each electrode 21 and each functional layer 34. In other words, the reflective layer 34A is provided between the light-emitting unit 101 and the functional layer 34. The reflective layer 34A reflects only visible light L1 and transmits light other than visible light L1.

[0087] The display device 1 having such a configuration can achieve high brightness, as in the first embodiment. Furthermore, since the reflective layer 34A is present between the light-emitting unit 101 and the functional layer 34, higher brightness can be reliably achieved compared to a case where the reflective layer 34A is not present.

[0088] In this embodiment, one reflective layer 34A is provided between the light-emitting section 101 and the functional layer 34, but this is not limiting. For example, a plurality of reflective layers 34A may be provided between the light-emitting section 101 and the functional layer 34.

[0089] <11. Eleventh embodiment> <11-1. Configuration example of detailed structure of display device> A configuration example of the detailed structure of the display device 1 according to this embodiment will be described with reference to Fig. 18. Fig. 18 is a diagram showing a configuration example of the detailed structure of the display device 1 according to this embodiment. This embodiment is basically the same as the first embodiment (see Fig. 4), but differences therebetween will be described.

[0090] 18 , in the display device 1 according to this embodiment, each photoelectric conversion unit 33 is provided directly below the boundary of each light-emitting unit 101. Similarly, each functional layer 34 is also provided directly below the boundary of each light-emitting unit 101. Note that the electrode edge films 22 according to the first embodiment are not present.

[0091] Each of the electrodes 21A is a reflective electrode that reflects light (for example, at least visible light L1, or both visible light L1 and infrared light L2). As the material of the reflective electrode, various materials similar to those in the sixth embodiment may be used.

[0092] The display device 1 having such a configuration can achieve high brightness, as in the first embodiment. Furthermore, since the electrodes 21A of the light-emitting elements 100 are reflective electrodes, higher brightness can be reliably achieved compared to when all the electrodes 21 are transparent electrodes.

[0093] In this embodiment, all of the electrodes 21A are reflective electrodes, but this is not limitative. For example, it is sufficient that any one of the electrodes 21A is a reflective electrode, and the number of the electrodes is not particularly limited.

[0094] <12. Actions and Effects of Each Embodiment> As described above, the display device 1 according to the present embodiment includes a light-emitting unit 101 that emits visible light L1, a photoelectric conversion unit 33 that is disposed opposite the light-emitting unit 101 and converts light into electricity, and a functional layer 34 that is disposed between the light-emitting unit 101 and the photoelectric conversion unit 33 and that reflects the visible light L1 and transmits light in a predetermined wavelength range other than the visible light L1 (e.g., infrared light L2) (see FIG. 4 , etc.). As a result, the functional layer 34 functions as a transmissive layer for light in the predetermined wavelength range and a reflective layer for the visible light L1. This increases the amount of visible light L1 (light energy) emitted from the display device 1, thereby achieving high brightness.

[0095] Furthermore, the light in the predetermined wavelength range may be infrared light (infrared rays) L2 (see FIG. 4, etc.), which makes it possible to realize gaze detection such as eye tracking using the infrared light L2.

[0096] The functional layer 34 may also be a dielectric multilayer film (see FIGS. 4 and 5, etc.), which makes it possible to easily realize the functional layer 34.

[0097] Furthermore, the light-emitting unit 101 may have an electrode 21 that transmits light in a predetermined wavelength range (see FIG. 4, etc.), which allows the photoelectric conversion unit 33 to receive light in the predetermined wavelength range, thereby enabling reliable detection of light in the predetermined wavelength range.

[0098] Furthermore, a plurality of light-emitting sections 101, photoelectric conversion sections 33, and functional layers 34 may be provided, and the plurality of functional layers 34 may be provided between the plurality of light-emitting sections 101 and the plurality of photoelectric conversion sections 33 (see FIG. 4). This ensures high brightness even when a plurality of light-emitting sections 101 are present.

[0099] Furthermore, each of the functional layers 34 may be provided so as to be in contact with each of the light-emitting sections 101 (see FIG. 4 ). This allows the functional layers 34 to be located close to the light-emitting sections 101, thereby ensuring high brightness.

[0100] Furthermore, the height positions of the plurality of functional layers 34 may be different from each other (see FIG. 15 ). This allows the height positions of the functional layers 34 to be changed for each light-emitting element 100 as needed, thereby achieving higher brightness and improved light detection accuracy (for example, gaze detection accuracy).

[0101] Furthermore, the thicknesses of the plurality of functional layers 34 may be different from each other (see FIG. 16 ). By changing the thickness of the functional layer 34 for each light-emitting element 100 as needed, it is possible to achieve higher brightness and improved light detection accuracy (for example, gaze detection accuracy).

[0102] Furthermore, a plurality of light-emitting sections 101 and a plurality of photoelectric conversion sections 33 may be provided, and the functional layer 34 may be formed so as to be positioned between the plurality of light-emitting sections 101 and the plurality of photoelectric conversion sections 33 (see FIG. 9 ). In this way, the functional layer 34 is shared by each of the light-emitting sections 101 and each of the photoelectric conversion sections 33, which makes it possible to simplify the configuration and facilitate manufacturing compared to when a plurality of functional layers 34 are provided.

[0103] Alternatively, a plurality of light-emitting sections 101 may be provided, the photoelectric conversion section 33 may be formed so as to face the plurality of light-emitting sections 101, and the functional layer 34 may be formed so as to be positioned between the plurality of light-emitting sections 101 and the photoelectric conversion sections 33 (see FIG. 10 ). In this way, the photoelectric conversion section 33 and the functional layer 34 are shared by each light-emitting section 101, which makes it possible to simplify the configuration and facilitate manufacturing compared to a case in which a plurality of photoelectric conversion sections 33 and a plurality of functional layers 34 are provided.

[0104] Furthermore, a plurality of light-emitting sections 101 are provided, and among the plurality of light-emitting sections 101, the light-emitting sections 101 other than the light-emitting section 101 facing the photoelectric conversion section 33 via the functional layer 34 may have an electrode 21A that reflects visible light L1 (see FIG. 13 ). This makes it possible to reliably achieve high brightness.

[0105] Furthermore, a plurality of light-emitting sections 101 may be provided, and the functional layer 34 and the photoelectric conversion section 33 may be provided directly below the boundary between the plurality of light-emitting sections 101 (see FIG. 18 ). Even in this case, high brightness can be achieved.

[0106] Furthermore, any of the plurality of light-emitting portions 101 may have an electrode 21A that reflects visible light L1 (see FIG. 18), thereby ensuring high brightness.

[0107] The display device 1 may further include a condenser lens 35 provided between the light-emitting unit 101 and the photoelectric conversion unit 33 (see FIGS. 11 and 12). This can improve the light detection accuracy (e.g., gaze detection accuracy) compared to a case where the condenser lens 35 is not provided.

[0108] The condenser lens 35 may be provided between the light-emitting section 101 and the functional layer 34 (see FIG. 11), thereby ensuring improved light detection accuracy.

[0109] The condenser lens 35 may be provided between the functional layer 34 and the photoelectric conversion section 33 (see FIG. 12), thereby ensuring improved light detection accuracy.

[0110] The display device 1 may further include a color filter 26 provided at a position facing the light-emitting portion 101 (see FIG. 14). Even in this case, high brightness can be achieved.

[0111] The display device 1 may further include a reflective layer 34A that is provided between the light-emitting unit 101 and the functional layer 34 and reflects only visible light L1 (see FIG. 17 ). This ensures high brightness.

[0112] 13. Other Embodiments Furthermore, the components and processes according to the above-described embodiments (including examples and modified examples) do not necessarily have to be physically configured as illustrated. In other words, the specific forms of distribution and integration of the components and processes are not limited to those illustrated, and all or part of them may be functionally or physically distributed or integrated in any unit depending on various loads, usage conditions, etc.

[0113] Furthermore, the configurations and processes of the above-described embodiments (including examples and modified examples) may be combined as appropriate. For example, at least a part of an embodiment may be combined as appropriate with at least a part of another embodiment. Furthermore, the effects of the embodiments are merely examples and are not intended to be limiting, and other effects may also be obtained.

[0114] For example, as the light-emitting unit 101, in addition to an organic electroluminescence element, an LED element, a semiconductor laser element, or the like can be used. These can be constructed using well-known materials and methods. From the viewpoint of constructing a flat display device, it is particularly preferable to have a configuration including an organic electroluminescence element as the light-emitting unit 101. Furthermore, as a material for constructing the light-emitting element 100, a suitable material is appropriately selected from transparent organic materials and inorganic materials.

[0115] The organic layer 23 may also include a structure in which a plurality of light-emitting layers are stacked. For example, a light-emitting element 100 that emits white light can be configured by stacking red, blue, and green light-emitting layers or by stacking blue and yellow light-emitting layers. The electrode layer 24 does not have to be common to each light-emitting element 100, and may be provided as an electrode for each light-emitting element 100.

[0116] Furthermore, the light-emitting element 100 may have, for example, a resonator structure that resonates light. By having the light-emitting element 100 have a resonator structure, the light emission color of the light-emitting element 100 can be set to a predetermined display color. In order to further improve the color purity of light with a long wavelength, for example, a color filter 26 corresponding to the light-emitting element 100 for red may be provided. Alternatively, in order to improve the color purity of the overall display color, a color filter 26 corresponding to each light-emitting element 100 for each color may be provided.

[0117] Furthermore, a pixel may be composed of one light-emitting element 100 or a plurality of light-emitting elements 100. For example, a pixel may be composed of a plurality of sub-pixels. Specifically, a pixel may be composed of three types of sub-pixels: a red-display sub-pixel, a green-display sub-pixel, and a blue-display sub-pixel. Alternatively, a pixel may be composed of a set of these three types of sub-pixels plus one or more types of sub-pixels.

[0118] Furthermore, there may be a partition wall separating adjacent light emitting elements 100, and this partition wall may be formed using a material appropriately selected from known inorganic materials or organic materials. For example, the partition wall may be formed by a combination of a known film formation method, such as a physical vapor deposition method (PVD method) exemplified by a vacuum deposition method or a sputtering method, or various chemical vapor deposition methods (CVD methods), and a known patterning method, such as an etching method or a lift-off method.

[0119] In addition, the pixel values ​​of the display device 1 can be exemplified by several image display resolutions such as VGA (640,480), S-VGA (800,600), XGA (1024,768), APRC (1152,900), S-XGA (1280,1024), U-XGA (1600,1200), HD-TV (1920,1080), Q-XGA (2048,1536), as well as (1920,1035), (720,480), and (1280,960), but are not limited to these values.

[0120] 14. Examples of Pixel Arrays Various pixel arrays (color arrays) are applicable to the display device 1 according to the present embodiment described above. FIGS. 19 to 21 are diagrams illustrating pixel arrays. Examples of color arrays (color patterns) include an RGB stripe array as shown in FIG. 19 , an RGB delta array as shown in FIG. 20 , and a square array as shown in FIG. 21 . In addition to these color arrays, various patterns such as a Bayer array (e.g., RGBG, GRGB, RGGB, etc.) and an RGB mosaic array can also be used. Furthermore, various complementary colors can be used in addition to the primary colors of RGB.

[0121] 15. Application Examples The display device 1 according to the present embodiment described above is used for various applications. FIG. 22 is a diagram illustrating an eye-tracking application. As shown in FIG. 22 , examples of eye-tracking applications include iris authentication, gaze information collection (e.g., gaze big data), biometric information collection, gesture recognition, gaze operation (e.g., gaze-operated user interface), and foveated rendering. Note that the display device 1 described above can be applied to various applications other than eye-tracking applications.

[0122] 16. Application Examples The display device 1 according to the present embodiment described above is used as a display unit of electronic devices in a variety of fields, for example, to display a video signal input to the electronic device or a video signal generated within the electronic device as an image or video. For example, the display device 1 according to the present embodiment can be used as a display unit of mobile terminal devices such as smartphones and mobile phones, digital still cameras, head-mounted displays, see-through head-mounted displays, television devices, notebook personal computers, video cameras, electronic books, game devices, and the like.

[0123] Such a display device 1 may be used in fields such as virtual reality (VR) and augmented reality (AR). The display device 1 according to the present embodiment may include a sealed module. The display module may include a circuit unit or a flexible printed circuit (FPC) for inputting and outputting signals from the outside to the light-emitting region.

[0124] Below, specific examples (application examples) of electronic devices using the display device 1 according to this embodiment include a smartphone 600, a digital still camera 650, a head-mounted display 700, a see-through head-mounted display 750, a television device 800, and a vehicle 900. However, the specific examples given here are merely examples, and the present invention is not limited to these.

[0125] 23 is a diagram showing an example of the appearance of a smartphone 600. As shown in Fig. 23, the smartphone 600 includes a display unit 601 that displays various information, and an operation unit 602 that includes buttons and the like that accept operation inputs from a user. The display unit 601 is configured by the display device 1 according to the above-described embodiment.

[0126] 24 and 25 are diagrams each showing an example of the appearance of a digital still camera 650. Fig. 24 shows a front view of the digital still camera 650, and Fig. 25 shows a rear view of the digital still camera 650. As shown in Figs. 24 and 25, the digital still camera 650 is, for example, a single-lens reflex type with interchangeable lenses, and has an interchangeable taking lens unit (interchangeable lens) 652 located approximately in the center of the front of a camera main body (camera body) 651, and a grip part 653 for the photographer to hold on the left side of the front.

[0127] A monitor 654 is provided at a position shifted to the left from the center on the back of the camera body 651. An electronic viewfinder (eyepiece window) 655 is provided above the monitor 654. By looking through the electronic viewfinder 655, the photographer can visually confirm the optical image of the subject guided by the photographing lens unit 652 and determine the composition of the photograph. Either or both of the monitor 654 and the electronic viewfinder 655 are configured by the display device 1 according to the above-described embodiment.

[0128] 26 is a diagram showing an example of the appearance of a head-mounted display 700. As shown in Fig. 26, the head-mounted display 700 has, for example, ear hooks 702 for wearing on the user's head on both sides of a glasses-shaped display unit 701. The display unit 701 is configured by the display device 1 according to the above-described embodiment.

[0129] 27 is a diagram showing an example of the appearance of a see-through head mounted display 750. As shown in FIG. 27 , the see-through head mounted display 750 is composed of a main body 751, an arm 752, and a lens barrel 753. The main body 751 is connected to the arm 752 and glasses 754. Specifically, an end of the long side of the main body 751 is coupled to the arm 752, and one side of the main body 751 is connected to the glasses 754 via a connecting member (not shown). The main body 751 may also be worn directly on the head of a human body.

[0130] The main body 751 incorporates a control board and a display unit for controlling the operation of the see-through head mounted display 750. The arm 752 connects the main body 751 to the lens barrel 753 and supports the lens barrel 753. Specifically, the arm 752 is coupled to an end of the main body 751 and an end of the lens barrel 753, respectively, and fixes the lens barrel 753. The arm 752 also incorporates a signal line for communicating data related to images provided from the main body 751 to the lens barrel 753. The display unit of the main body 751 is configured by the display device 1 according to the above-described embodiment.

[0131] The lens barrel 753 projects image light provided from the main body 751 via the arm 752 through the lenses of the glasses 754 toward the eyes of the user wearing the see-through head-mounted display 750 .

[0132] 28 is a diagram showing an example of the appearance of a television device 800. As shown in Fig. 28, the television device 800 has an image display screen unit 801. The image display screen unit 801 includes, for example, a front panel 802 and a filter glass 803. The image display screen unit 801 is configured by the display device 1 according to the above-described embodiment.

[0133] 29 and 30 are diagrams showing the internal configuration of a vehicle 900. Fig. 29 shows the interior of the vehicle 900 from the rear to the front, and Fig. 30 shows the interior of the vehicle 900 from diagonally rear to diagonally front.

[0134] 29 and 30 , a vehicle 900 has a center display 951, a console display 952, a head-up display 953, a digital rearview mirror 954, a steering wheel display 955, and a rear entertainment display 956. Any or all of these displays 951 to 956 are configured by the display device 1 according to the above-described embodiment.

[0135] The center display 951 is disposed on the dashboard 904 in a position facing the driver's seat 901 and the passenger's seat 902. While FIGS. 29 and 30 show examples of horizontally elongated center displays 951 (951C, 951L, 951R) extending from the driver's seat 901 to the passenger's seat 902, the screen size and location of the center display 951 are arbitrary. The center display 951 can display information detected by various sensors. As a specific example, the center display 951 can display an image captured by an image sensor, a distance image to obstacles in front of or to the side of the vehicle measured by a ToF sensor, and the body temperature of a passenger detected by an infrared sensor. The center display 951 can be used to display, for example, at least one of safety-related information, operation-related information, a life log, health-related information, authentication / identification-related information, and entertainment-related information.

[0136] The safety-related information includes information such as detection of drowsiness, distraction, mischief by children in the vehicle, whether a seatbelt is fastened, and whether a passenger has been abandoned. For example, this information is detected by a sensor disposed on the rear side of the center display 951. The operation-related information is obtained by detecting gestures related to passenger operations using a sensor. The detected gestures may include operations of various equipment within the vehicle 900. For example, operations of the air conditioning system, navigation system, AV system, lighting system, etc. are detected. The life log includes life logs of all passengers. For example, the life log includes a record of each passenger's actions while on board. By acquiring and storing the life log, the condition of the passenger at the time of the accident can be confirmed. The health-related information is obtained by detecting the passenger's body temperature using a temperature sensor and inferring the passenger's health condition based on the detected body temperature. Alternatively, the passenger's face may be captured using an image sensor and the passenger's health condition may be inferred from the facial expression captured in the image. Furthermore, the passenger may be spoken to by an automated voice and the passenger's health condition may be inferred based on the passenger's responses. The authentication / identification-related information includes a keyless entry function that uses a sensor to perform facial authentication, a function that automatically adjusts the seat height and position by facial recognition, etc. The entertainment-related information includes a function that uses a sensor to detect operation information of an AV device by an occupant, a function that recognizes the occupant's face with a sensor and provides content suitable for the occupant via the AV device, etc.

[0137] The console display 952 can be used to display, for example, life log information. The console display 952 is disposed near the shift lever 907 on the center console 906 between the driver's seat 901 and the passenger seat 902. The console display 952 can also display information detected by various sensors. Furthermore, the console display 952 may display an image of the surroundings of the vehicle captured by an image sensor, or an image showing the distance to an obstacle around the vehicle.

[0138] The head-up display 953 is virtually displayed behind the windshield 903 in front of the driver's seat 901. The head-up display 953 can be used to display, for example, at least one of safety-related information, operation-related information, a life log, health-related information, authentication / identification-related information, and entertainment-related information. Because the head-up display 953 is often virtually located in front of the driver's seat 901, it is suitable for displaying information directly related to the operation of the vehicle 900, such as the speed of the vehicle 900 and the remaining fuel (battery) level.

[0139] The digital rearview mirror 954 can not only display the rear of the vehicle 900, but also the status of passengers in the rear seats. Therefore, by placing a sensor on the back side of the digital rearview mirror 954, it can be used to display life log information, for example.

[0140] The steering wheel display 955 is disposed near the center of the steering wheel 905 of the vehicle 900. The steering wheel display 955 can be used to display, for example, at least one of safety-related information, operation-related information, a life log, health-related information, authentication / identification-related information, and entertainment-related information. In particular, because the steering wheel display 955 is located near the driver's hands, it is suitable for displaying life log information such as the driver's body temperature, and for displaying information related to the operation of AV equipment, air conditioning equipment, etc.

[0141] The rear entertainment display 956 is attached to the back side of the driver's seat 901 and the passenger seat 902 and is intended for viewing by rear seat passengers. The rear entertainment display 956 can be used to display, for example, at least one of safety-related information, operation-related information, a life log, health-related information, authentication / identification-related information, and entertainment-related information. In particular, since the rear entertainment display 956 is located directly in front of the rear seat passengers, information related to the rear seat passengers is displayed on the rear entertainment display 956. For example, the rear entertainment display 956 may display information related to the operation of an AV device or an air conditioning system, or may display the results of measuring the body temperature of the rear seat passengers using a temperature sensor.

[0142] As described above, by arranging a sensor on the rear side of the display, it is possible to measure the distance to surrounding objects. Optical distance measurement methods are broadly divided into passive and active types. Passive types measure distance by receiving light from an object without projecting light from the sensor onto the object. Passive types include the lens focusing method, the stereo method, and the monocular vision method. Active types measure distance by projecting light onto an object and receiving light reflected from the object with a sensor. Active types include the optical radar method, the active stereo method, the photometric stereo method, the moire topography method, and the interferometry method. The display device 1 according to the embodiment can be applied to any of these distance measurement methods. By using a sensor arranged on the rear side of the display device 1 according to the embodiment, the above-mentioned passive or active distance measurement can be performed.

[0143] Note that the electronic devices to which the display device 1 according to each embodiment can be applied are not limited to the above examples. The display device 1 according to each embodiment can be applied to the display unit of any electronic device that displays an image based on an externally input image signal or an internally generated image signal. In other words, the technology according to the present disclosure can be applied to a variety of products. For example, the display device 1 according to each embodiment may be implemented as a display unit of any type of moving object, such as the vehicle 900 described above, such as an automobile, an electric vehicle, a hybrid electric vehicle, a motorcycle, a bicycle, personal mobility, an airplane, a drone, a ship, a robot, construction machinery, or agricultural machinery (tractor). Furthermore, for example, the display device 1 according to each embodiment may be applied to a display unit included in an endoscopic surgery system, a microsurgery system, or the like.

[0144] Although the embodiments, modifications, and application examples of the present disclosure have been described in detail above with reference to the accompanying drawings, the technical scope of the present disclosure is not limited to such examples. It is clear that a person skilled in the art of the present disclosure can conceive of various modified or altered examples within the scope of the technical idea described in the claims, and it is understood that these also naturally fall within the technical scope of the present disclosure.

[0145] <17. Supplementary Note> The present technology may also be configured as follows. (1) A display device comprising: a light-emitting unit that emits visible light; a photoelectric conversion unit that is provided opposite the light-emitting unit and converts light into electricity; and a functional layer that is provided between the light-emitting unit and the photoelectric conversion unit and that reflects the visible light and transmits light in a predetermined wavelength range other than the visible light. (2) The display device according to (1), wherein the light in the predetermined wavelength range is infrared light. (3) The display device according to (1) or (2), wherein the functional layer is a dielectric multilayer film. (4) The display device according to any one of (1) to (3), wherein the light-emitting unit has an electrode that transmits light in the predetermined wavelength range. (5) The display device according to any one of (1) to (4), wherein a plurality of the light-emitting units, the photoelectric conversion units, and the functional layers are provided, and a plurality of the functional layers are provided between a plurality of the light-emitting units and a plurality of the photoelectric conversion units. (6) The display device according to (5), wherein each of the plurality of functional layers is provided so as to be in contact with each of the plurality of light-emitting sections. (7) The display device according to (5) or (6), wherein the height positions of each of the plurality of functional layers are different. (8) The display device according to any one of (5) to (7), wherein the thicknesses of each of the plurality of functional layers are different. (9) The display device according to any one of (1) to (4), wherein a plurality of each of the light-emitting sections and the photoelectric conversion sections are provided, and the functional layer is formed so as to be positioned between the plurality of light-emitting sections and the plurality of photoelectric conversion sections. (10) The display device according to any one of (1) to (4), wherein a plurality of the light-emitting sections are provided, the photoelectric conversion sections are formed so as to face the plurality of light-emitting sections, and the functional layer is formed so as to be positioned between the plurality of light-emitting sections and the photoelectric conversion sections. (11) The display device according to any one of (1) to (4), wherein a plurality of the light-emitting sections are provided, and among the plurality of light-emitting sections, the light-emitting sections other than the light-emitting section facing the photoelectric conversion section via the functional layer have an electrode that reflects the visible light.(12) The display device according to any one of (1) to (4), wherein a plurality of the light-emitting sections are provided, and the functional layer and the photoelectric conversion section are provided directly below a boundary between the plurality of light-emitting sections. (13) The display device according to (12), wherein any of the plurality of light-emitting sections has an electrode that reflects the visible light. (14) The display device according to any one of (1) to (13), further comprising a condenser lens provided between the light-emitting section and the photoelectric conversion section. (15) The display device according to (14), wherein the condenser lens is provided between the light-emitting section and the functional layer. (16) The display device according to (14), wherein the condenser lens is provided between the functional layer and the photoelectric conversion section. (17) The display device according to any one of (1) to (16), further comprising a color filter provided in a position facing the light-emitting section. (18) The display device according to any one of (1) to (17), further comprising a reflective layer provided between the light-emitting section and the functional layer, and reflecting only the visible light. (19) A method for manufacturing a display device, including providing a functional layer between a light-emitting section that emits visible light and a photoelectric conversion section that converts light into electricity, the functional layer reflecting the visible light and transmitting light in a predetermined wavelength range other than the visible light. (20) A light-emitting device comprising: a light-emitting section that emits visible light; a photoelectric conversion section that converts light into electricity, provided at a position facing the light-emitting section; and a functional layer that reflects the visible light and transmits light in a predetermined wavelength range other than the visible light. (21) A method for manufacturing a display device, comprising manufacturing the display device according to any one of (1) to (18). (22) A light-emitting device comprising any of the components of the display device according to any one of (1) to (18). (23) An electronic device comprising the display device according to any one of (1) to (18).

[0146] REFERENCE SIGNS LIST 1 display device 2 eye 3 optical system 11 horizontal drive circuit 12 vertical drive circuit 20 display panel 21 electrode 21A electrode 22 electrode edge film 23 organic layer 24 electrode layer 25 protective layer 26 color filter 30 detection panel 31 substrate 31a wiring 32 insulating layer 32a contact plug 33 photoelectric conversion section 34 functional layer 34a recess 34A reflective layer 35 condenser lens 50 resist layer 100 light emitting element 101 light emitting section 102 drive circuit L1 visible light L2 infrared light

Claims

1. A display device comprising: a light-emitting section that emits visible light; a photoelectric conversion section that is disposed opposite the light-emitting section and converts light into electricity; and a functional layer that is disposed between the light-emitting section and the photoelectric conversion section and that reflects the visible light and transmits light in a predetermined wavelength range other than the visible light.

2. The display device according to claim 1, wherein the light in the predetermined wavelength range is infrared light.

3. The display device according to claim 1, wherein the functional layer is a dielectric multilayer film.

4. The display device according to claim 1, wherein the light-emitting section has an electrode that transmits light in the predetermined wavelength range.

5. The display device according to claim 1, wherein a plurality of the light-emitting sections, photoelectric conversion sections and functional layers are provided, and a plurality of the functional layers are provided between a plurality of the light-emitting sections and a plurality of the photoelectric conversion sections.

6. The display device according to claim 5, wherein each of the plurality of functional layers is provided so as to be in contact with each of the plurality of light-emitting sections.

7. The display device according to claim 5, wherein the height positions of the plurality of functional layers are different from each other.

8. The display device according to claim 5, wherein the thicknesses of the plurality of functional layers are different from each other.

9. The display device according to claim 1, wherein a plurality of the light-emitting sections and a plurality of the photoelectric conversion sections are provided, and the functional layer is formed so as to be positioned between the plurality of the light-emitting sections and the plurality of the photoelectric conversion sections.

10. The display device according to claim 1, wherein a plurality of the light-emitting sections are provided, the photoelectric conversion section is formed so as to face the plurality of light-emitting sections, and the functional layer is formed so as to be positioned between the plurality of light-emitting sections and the photoelectric conversion section.

11. The display device according to claim 1, wherein a plurality of the light-emitting sections are provided, and among the plurality of light-emitting sections, the light-emitting sections other than the light-emitting section facing the photoelectric conversion section via the functional layer have electrodes that reflect the visible light.

12. The display device according to claim 1, wherein a plurality of the light-emitting sections are provided, and the functional layer and the photoelectric conversion section are provided directly below the boundary between the plurality of light-emitting sections.

13. The display device according to claim 12, wherein any one of the plurality of light-emitting sections has an electrode that reflects the visible light.

14. The display device according to claim 1, further comprising a condenser lens provided between the light-emitting section and the photoelectric conversion section.

15. The display device according to claim 14, wherein the condenser lens is provided between the light-emitting section and the functional layer.

16. The display device according to claim 14, wherein the condenser lens is provided between the functional layer and the photoelectric conversion section.

17. The display device according to claim 1, further comprising a color filter disposed in a position facing the light-emitting portion.

18. The display device according to claim 1, further comprising a reflective layer provided between the light-emitting section and the functional layer, the reflective layer reflecting only the visible light.

19. A method for manufacturing a display device, comprising providing a functional layer between a light-emitting section that emits visible light and a photoelectric conversion section that converts light into electricity, the functional layer reflecting the visible light and transmitting light in a predetermined wavelength range other than the visible light.

20. A light-emitting element comprising: a light-emitting section that emits visible light; a photoelectric conversion section that is disposed opposite the light-emitting section and converts light into electricity; and a functional layer that is disposed between the light-emitting section and the photoelectric conversion section and that reflects the visible light and transmits light in a predetermined wavelength range other than the visible light.

Images