Display device

Abstract

A display device is formed by arranging a plurality of light emitting element groups on a substrate 26, each light emitting element group including: a first light emitting element 10 provided with a first light emitting region 11R and a first color filter layer 51R; a second light emitting element 10G provided with a second light emitting region 11G and a second color filter layer 51G; and a first light emitting element 10G provided with a third light emitting region 11B and a third color filter layer 51B. In adjacent light emitting elements, an angle (θ) formed by a boundary line of a bottom surface of the color filter layer 51 facing the light emitting region 11 and an end of the light emitting region 11 and a normal to the substrate 26 is the same in each light emitting element, or alternatively, a distance (L) from a boundary line of the bottom surface of the color filter layer 51 to an orthogonal projection image on the substrate 26 to an end of the light emitting region 11 to an orthogonal projection image on the substrate 26 is the same in each light emitting element.

Description

Technical Field

[0001] The present disclosure relates to a display device including a plurality of light emitting elements. Background Art

[0002] In recent years, the development of display devices (organic EL displays) using organic electroluminescent (EL) elements as light-emitting elements is developing. In this display device, for example, a second electrode (upper electrode, such as a cathode electrode) and an organic layer including at least a light-emitting layer are formed on a first electrode (lower electrode, such as an anode electrode) formed for each pixel isolation. In addition, for example, a red light-emitting element obtained by combining an organic layer emitting white light or red light and a red color filter layer, a green light-emitting element obtained by combining an organic layer emitting white light or green light and a green color filter layer, and a blue light-emitting element obtained by combining an organic layer emitting white light or blue light and a blue color filter layer, each is arranged as a sub-pixel, and these sub-pixels constitute a pixel. The light from the light-emitting layer is emitted to the outside via the second electrode (upper electrode).

[0003] In such display devices, color shift and color mixing often occur disadvantageously. For example, Japanese Patent Application Publication No. 2013-152853 discloses a display device that addresses this drawback. The display device disclosed in this patent specifies the thickness of each layer constituting the light-emitting element, the refractive index of each material constituting each layer, and the width and thickness of the color filter layer.

[0004] Reference List

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2013-152853. Summary of the Invention

[0007] Problems to be solved by the present invention

[0008] Incidentally, in the actual process of manufacturing a light-emitting element, the side surface of the color filter layer is usually in a positive cone state or a negative cone state. However, in the above-mentioned patent disclosure, this inclination of the side surface of the color filter layer is not taken into account. In addition, since the inclination angle (cone angle) of the side of the color filter layer is usually different between light-emitting elements, it is not possible to expect an improvement in the viewing angle characteristics unless these inclination angles are taken into account. Specifically, when the pixel pitch is very small, the aspect ratio of the color filter layer is large, and the influence of the tapered state of the side surface is large.

[0009] Therefore, an object of the present disclosure is to provide a display device including a plurality of light emitting elements, each of which has a configuration and structure in which color shift and color mixing are less likely to occur.

[0010] Solutions to the Problem

[0011] The display device for achieving the above-mentioned object according to the first or second aspect of the present disclosure is formed by arranging a plurality of light-emitting element groups on a substrate, each light-emitting element group including:

[0012] A first light-emitting element comprising a first light-emitting region and a first color filter layer disposed above the first light-emitting region;

[0013] a second light-emitting element comprising a second light-emitting region and a second color filter layer disposed above the second light-emitting region; and

[0014] The third light-emitting element includes a third light-emitting region and a third color filter layer arranged above the third light-emitting region.

[0015] Furthermore, in the display device of the first aspect of the present disclosure, an angle (θ) formed by the shortest line segment connecting the boundary line of the bottom surface of the color filter layer facing the light-emitting region and the end of the light-emitting region and the normal to the substrate is the same in adjacent light-emitting elements. Furthermore, in the display device of the second aspect of the present disclosure, a distance (L) from the boundary line of the bottom surface of the color filter layer facing the light-emitting region to the orthogonal projection image on the substrate to the end of the light-emitting region to the orthogonal projection image on the substrate is the same in adjacent light-emitting elements. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 are diagrams schematically showing the arrangement of color filter layers in the display device of the first embodiment, and are conceptual cross-sectional diagrams of the display device of the first embodiment.

[0017] Figure 2 are diagrams schematically showing the arrangement of color filter layers in the display device of the first embodiment, and are conceptual cross-sectional diagrams of the display device of the first embodiment.

[0018] Figure 3 is a diagram schematically showing the arrangement of light emitting areas in the display device of the first embodiment.

[0019] Figure 4 is a conceptual cross-sectional view of the display device of the first embodiment for explaining that color mixture is less likely to occur in the display device of the first embodiment.

[0020] Figure 5 are diagrams schematically illustrating the arrangement of color filter layers in the display device of the second embodiment, and various conceptual cross-sectional diagrams of the display device of the second embodiment.

[0021] Figure 6are diagrams schematically illustrating the arrangement of color filter layers in the display device of the second embodiment, and various conceptual cross-sectional diagrams of the display device of the second embodiment.

[0022] Figure 7 is a diagram schematically showing the arrangement of light emitting areas in the display device of the second embodiment.

[0023] Figure 8 1 and 2 are various conceptual cross-sectional views for explaining the display device of the second embodiment in which color mixing is less likely to occur.

[0024] Figure 9 1 and 2 are various conceptual cross-sectional views for explaining the display device of the second embodiment in which color mixing is less likely to occur.

[0025] Figure 10 1 and 2 are various conceptual cross-sectional views for explaining the display device of the second embodiment in which color mixing is less likely to occur.

[0026] Figure 11 1 and 2 are various conceptual cross-sectional views for explaining the display device of the second embodiment in which color mixing is less likely to occur.

[0027] Figure 12A 、 Figure 12B and Figure 12C is a diagram for explaining the mechanism by which color mixing occurs in the display device of the second embodiment and a conventional display device.

[0028] Figure 13 are diagrams schematically illustrating the arrangement of color filter layers in the display device of the third embodiment, and various conceptual cross-sectional diagrams of the display device of the third embodiment.

[0029] Figure 14 are diagrams schematically illustrating the arrangement of color filter layers in the display device of the third embodiment, and various conceptual cross-sectional diagrams of the display device of the third embodiment.

[0030] Figure 15 is a diagram schematically showing the arrangement of light emitting areas in the display device of the third embodiment.

[0031] Figure 16 are diagrams schematically illustrating the arrangement of color filter layers in the display device of the fourth embodiment, and various conceptual cross-sectional diagrams of the display device of the third embodiment.

[0032] Figure 17A 、 Figure 17B 、 Figure 17C 、 Figure 17D 、 Figure 17E 、 Figure 17F and Figure 17G are schematic partial cross-sectional views of various color filter layers.

[0033] Figure 18 FIG. 1 is a partial cross-sectional view of the display device of the first embodiment.

[0034] Figure 19 is a diagram schematically showing the arrangement of light emitting areas as a modification in the display device of the second embodiment.

[0035] Figure 20A and Figure 20B An example is shown in which the display device of the present disclosure is applied to a lens-interchangeable single-lens reflex digital still camera. Figure 20A shows a front view of a digital still camera, Figure 20B A rear view thereof is shown.

[0036] Figure 21 is an external view of a head-mounted display showing an example in which the display device of the present disclosure is applied to the head-mounted display.

[0037] Figure 22 are diagrams schematically illustrating the arrangement of color filter layers in a conventional display device, and various conceptual cross-sectional views of the conventional display device.

[0038] Figure 23 are various conceptual cross-sectional views of a conventional display device for explaining the occurrence of color mixing in the conventional display device.

[0039] Figure 24A and Figure 24B 1 and 2 are conceptual diagrams of light-emitting elements having first and second examples of resonator structures, respectively.

[0040] Figure 25A and Figure 25B 1 and 2 are conceptual diagrams of light-emitting elements of third and fourth examples respectively having resonator structures.

[0041] Figure 26A and Figure 26B 1 and 2 are conceptual diagrams of light-emitting elements of fifth and sixth examples respectively having resonator structures.

[0042] Figure 27A is a conceptual diagram of a light-emitting element of a seventh example having a resonator structure, Figure 27B and Figure 27C is a conceptual diagram of a light-emitting element having an eighth example of a resonator structure. DETAILED DESCRIPTION

[0043] Hereinafter, the present disclosure will be described based on the embodiments with reference to the accompanying drawings. However, the present disclosure is not limited to the embodiments, and the various numerical values ​​and materials in the embodiments are illustrative. Note that the description will be made in the following order.

[0044] 1. General Description of the Display Devices According to the First and Second Aspects of the Disclosure

[0045] 2. First Embodiment (Display Device According to the First and Second Aspects of the Present Disclosure)

[0046] 3. Second embodiment (modification of the first embodiment)

[0047] 4. Third Embodiment (Another Modification of the First Embodiment)

[0048] 5. Fourth embodiment (further modification of the first embodiment)

[0049] 6. Others

[0050] <General Description of Display Device According to First and Second Aspects of the Present Disclosure>

[0051] In the display device according to the first and second aspects of the present disclosure, the area (S) of the orthogonal projection image of the top surface area of ​​the color filter layer surrounded by the boundary line between the top surface of the color filter layer (light emitting surface) and the top surface of the color filter layer (light emitting surface) on the substrate is top ) can be the same in the first light emitting element, the second light emitting element, and the third light emitting element. In this case, the area of ​​the light emitting region (S EL ) can be different among the first light-emitting element, the second light-emitting element and the third light-emitting element.

[0052] Alternatively, in the display devices according to the first and second aspects of the present disclosure, the area (S ) of the orthogonal projection image of the color filter layer top surface region surrounded by the boundary line between the color filter layer top surface (light emitting surface) and the color filter layer top surface (light emitting surface) on the substrate is top ) may be different between the first light emitting element, the second light emitting element, and the third light emitting element. In addition, in this case, the area of ​​the light emitting region (S EL ) can be the same in the first light-emitting element, the second light-emitting element and the third light-emitting element.

[0053] In the display device including the above-mentioned various preferred modes according to the first and second aspects of the present disclosure, the first light-emitting area, the second light-emitting area, and the third light-emitting area can emit white light. Alternatively, the first light-emitting area can emit red light, the second light-emitting area can emit green light, and the third light-emitting area can emit blue light. However, the present disclosure is not limited to this, and a fourth light-emitting element emitting white light or a fourth light-emitting element emitting light of a color other than red, green, and blue can also be added.

[0054] The following can be exemplified as the arrangement and arrangement state of the first light emitting element, the second light emitting element, and the third light emitting element.

[0055] The first light emitting elements constituting the plurality of light emitting element groups may be arranged along a first direction,

[0056] The second light emitting elements constituting the plurality of light emitting element groups may be arranged along the first direction, and

[0057] The third light emitting elements constituting the plurality of light emitting element groups may be arranged along the first direction (so-called stripe arrangement). Alternatively,

[0058] The light emitting element group can be composed of 4 light emitting elements arranged in 2×2.

[0059] The first light emitting element may be arranged adjacent to two third light emitting elements,

[0060] The second light emitting element may be arranged adjacent to two third light emitting elements, and

[0061] Each of the two third light-emitting elements can be arranged adjacent to the first light-emitting element and the second light-emitting element (so-called diagonal arrangement). In this case, the light-emitting element group occupies, for example, a rectangular area. Alternatively,

[0062] The light emitting element group may be composed of a first light emitting element, a second light emitting element and a third light emitting element.

[0063] The first light emitting element may be arranged adjacent to the second light emitting element and the third light emitting element, and

[0064] The second light-emitting element may be arranged adjacent to the first and third light-emitting elements. Note that in this case, the light-emitting element group occupies, for example, a rectangular area. Alternatively, the first, second, and third light-emitting elements may be arranged in a stripe, a triangle, a rectangle, or a pentile arrangement.

[0065] In the display device of the first aspect of the present disclosure, in adjacent light-emitting elements, the angle (θ) formed by the shortest line segment connecting the boundary line of the bottom surface of the color filter layer facing the light-emitting area and the end of the light-emitting area and the normal to the substrate (or the first substrate or the second substrate described later) is the same in the light-emitting elements. In addition, in the display device of the second aspect of the present disclosure, in adjacent light-emitting elements, the distance (L) from the boundary line of the bottom surface of the color filter layer facing the light-emitting area to the orthogonal projection image of the substrate (or the first substrate or the second substrate described later) to the end of the light-emitting area to the orthogonal projection image of the substrate (or the first substrate or the second substrate described later) is the same in the light-emitting elements. Here, "the same" means as follows. That is, for example, in five areas including the center part of four quadrants obtained by dividing the display device into four areas of the first quadrant, the second quadrant, the third quadrant and the fourth quadrant, and the origin, one or more light-emitting element groups are appropriately selected. In the selected light-emitting element group, the angle (θ) or distance (L) in each light-emitting element is determined. In addition, the average value θ of the angle (θ) or distance (L) is determined. ave , L ave and standard deviation σ angle ,σ distance .So,

[0066] When σ angle / θ ave ≤0.015 and

[0067] Satisfy σ distance / L ave ≤0.2,

[0068] are considered "the same", and

[0069] When σ angle / θ ave >0.015 and

[0070] Satisfy σ distance / L ave >0.2,

[0071] are considered “different”. However, these requirements are illustrative. For example, in θ ave = 76 degrees and σ angle = 1.125 degrees, when θ ave When the value of is different from the design value by more than ±5 degrees, it is considered to be “different”. In the case where the end area of ​​the adjacent color filter layer overlaps the end area of ​​the specific color filter layer, the end of the specific color filter layer is defined as the boundary line of the bottom surface.

[0072] In the display device according to the first aspect and the second aspect of the present disclosure, including the above-mentioned preferred modes and configurations (hereinafter, these are collectively referred to as "display devices of the present disclosure, etc."), in the boundary area between adjacent color filter layers, a structure composed of a transparent resin (composed of a transparent resin layer, for example, see Japanese Patent Application Publication No. 2014-089804) can be arranged at the bottom of the bottom surface including the color filter layer. The color filter layer is composed of a resin (for example, a photocurable resin) to which a colorant containing a desired pigment or dye is added. By selecting the pigment or dye, adjustment is performed so that the transmittance in the target wavelength range of red, green, blue, etc. is high, and the transmittance in other wavelength ranges is low. Such a color filter layer can be composed of a known color-blocking material. In a light-emitting element that emits white light, only a transparent filter needs to be arranged.

[0073] The display device and the like disclosed in the present invention are top-emitting display devices that emit light from a second substrate. For example, in a top-emitting display device, it is only necessary to form a color filter layer above the first substrate, but the color filter layer can be arranged on one side of the first substrate (on-chip color filter structure (OCCF structure)), or can be arranged on one side of the second substrate. In another way of expression, the display device and the like disclosed in the present invention include a first substrate, a second substrate, and an image display unit sandwiched between the first substrate and the second substrate. In the image display unit, a plurality of light-emitting elements including the above-mentioned preferred modes and configurations are arranged in a two-dimensional matrix. Here, the light-emitting elements are formed on one side of the first substrate.

[0074] Specifically, each light-emitting element in the display device of the present disclosure includes a first electrode, an organic layer formed on the first electrode, a second electrode formed on the organic layer, a protective layer (planarization layer) formed on the second electrode, and a color filter layer formed on the protective layer. In addition, light from the organic layer is emitted to the outside via the second electrode, the protective layer, and the color filter layer. A first electrode is arranged for each light-emitting element. An organic layer is arranged for each light-emitting element, or an organic layer is arranged while being shared by the light-emitting elements. The second electrode is arranged while being shared by the light-emitting elements. That is, the second electrode is a so-called solid electrode. The first substrate is arranged under the base, and the second substrate is arranged on or above the top surface of the color filter layer. The light-emitting area is arranged on the base.

[0075] In the display device and the like of the present disclosure, the first electrode may be in contact with a portion of the organic layer, or a portion of the first electrode may be in contact with the organic layer. In these cases, specifically, the first electrode may be smaller than the organic layer, the first electrode may be the same size as the organic layer, the first electrode may be larger than the organic layer, or an insulating layer may be formed between the edge of the first electrode and the organic layer. The area where the first electrode contacts the organic layer is the light-emitting area.

[0076] When the first, second, and third light-emitting regions emit white light, the organic layer emits white light. In this case, the organic layer may have a stacked structure consisting of a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer. Alternatively, the organic layer may have a structure obtained by stacking two layers of a blue light-emitting layer that emits blue light and a yellow light-emitting layer that emits yellow light, and emit white light as a whole. Alternatively, the organic layer may have a structure obtained by stacking two layers of a blue light-emitting layer that emits blue light and an orange light-emitting layer that emits orange light, and emit white light as a whole.

[0077] As described above, in the display device of the present disclosure, the organic layer may be composed of at least two light-emitting layers that emit different colors. In this case, the light emitted from the organic layer may be white light. Specifically, the organic layer may have a structure obtained by stacking three layers of a red light-emitting layer that emits red light (wavelength: 620nm to 750nm), a green light-emitting layer that emits green light (wavelength: 495nm to 570nm), and a blue light-emitting layer that emits blue light (wavelength: 450nm to 495nm), and emits white light as a whole. Alternatively, the organic layer may have a structure obtained by stacking two layers of a blue light-emitting layer that emits blue light and a yellow light-emitting layer that emits yellow light, and emits white light as a whole. Alternatively, the organic layer may have a structure obtained by stacking two layers of a blue light-emitting layer that emits blue light and an orange light-emitting layer that emits orange light, and emits white light as a whole. In addition, this organic layer that emits white light is combined with a red color filter layer to form a red light-emitting element. The organic layer that emits white light is combined with a green color filter layer to form a green light-emitting element. An organic layer emitting white light is combined with a blue color filter layer to form a blue light-emitting element. A combination of sub-pixels such as a red light-emitting element, a green light-emitting element, and a blue light-emitting element constitutes one pixel. In some cases, a red light-emitting element, a green light-emitting element, a blue light-emitting element, and a light-emitting element emitting white light (or a light-emitting element emitting complementary colors) can constitute one pixel. In a mode consisting of at least two light-emitting layers emitting light of different colors, there is actually a case where the light-emitting layers emitting light of different colors are mixed and not clearly separated into layers.

[0078] Alternatively, the organic layer may be composed of a single light-emitting layer. In this case, for example, the light-emitting element may be composed of a red light-emitting element having an organic layer including a red light-emitting layer, a green light-emitting element having an organic layer including a green light-emitting layer, or a blue light-emitting element having an organic layer including a blue light-emitting layer. These three light-emitting elements (sub-pixels) constitute one pixel.

[0079] Examples of materials constituting the protective layer (planarization layer) include acrylic resins, SiN, SiON, SiC, amorphous silicon (α-Si), Al2O3, and TiO2. The protective layer can be formed based on known methods, such as various CVD methods, various coating methods, various PVD methods including sputtering and vacuum vapor deposition methods, or various printing methods including screen printing methods. In addition, as a method for forming the protective layer, an atomic layer deposition (ALD) method can also be used. The protective layer can be shared by a plurality of light-emitting elements, or can be arranged separately in each light-emitting element. The protective layer and the second substrate are bonded to each other via, for example, a resin layer (sealing resin layer). Examples of materials constituting the resin layer (sealing resin layer) include thermosetting adhesives, such as acrylic adhesives, epoxy adhesives, urethane adhesives, silicon adhesives, or cyanoacrylate adhesives, and ultraviolet light curing adhesives.

[0080] On the outermost surface that emits light in the display device (specifically, the outer surface of the second substrate), an ultraviolet absorption layer, an anti-pollution layer, a hard coating layer, and an antistatic layer may be formed, or a protective member (eg, cover glass) may be disposed.

[0081] Furthermore, in the display device and the like disclosed herein, on-chip microlenses can be arranged on the light-emitting side. By arranging on-chip microlenses, light from the organic layer can be dispersed in a desired manner, thereby controlling viewing angle characteristics. For example, the on-chip microlenses can be formed from a known transparent resin material such as an acrylic resin and can be obtained by melt-flowing the transparent resin material, or by etching back the transparent resin material, using a combination of photolithography using a gray-tone mask and etching, or by forming the transparent resin material into a lens shape using a nanoprinting method.

[0082] In the display device and the like of the present disclosure, a base is formed on or above a first substrate. Examples of materials constituting the base include insulating materials such as SiO2, SiN, or SiON. Alternatively, it is only necessary to constitute the base by an insulating material having etching selectivity, and to form an insulating layer or the like on or above the base. The base can be formed by a formation method suitable for the material constituting the base, specifically, for example, based on known methods such as various CVD methods, various coating methods, various PVD methods including sputtering methods and vacuum vapor deposition methods, various printing methods including screen printing methods, plating methods, electrodeposition methods, immersion methods, or sol-gel methods.

[0083] Although the present disclosure is not limited to this, the light emitting element driving unit is arranged below or below the substrate. For example, the light emitting element driving unit includes a transistor (specifically, such as a MOSFET) formed on a silicon semiconductor substrate constituting the first substrate or a thin film transistor (TFT) arranged on each of the various substrates constituting the first substrate. The transistors and TFTs constituting the light emitting element driving unit can be connected to the first electrode via a contact hole (contact plug) formed on the substrate. The light emitting element driving unit can have a known circuit configuration. The second electrode is connected to the light emitting element driving unit via a contact hole (contact plug) formed in the substrate at the periphery of the display device. The light emitting element is formed on one side of the first substrate. As described above, the second electrode can be an electrode shared by a plurality of light emitting elements. That is, the second electrode can be a so-called solid electrode.

[0084] The first substrate or the second substrate can be composed of the following: a silicon semiconductor substrate, a high strain point glass substrate, a sodium glass (Na2O·CaO·SiO2) substrate, a borosilicate glass (Na2O·B2O3·SiO2) substrate, a forsterite (2MgO·SiO2) substrate, a lead glass (Na2O·PbO·SiO2) substrate, various glass substrates each having an insulating material layer formed on its surface, a quartz substrate, a quartz substrate having an insulating material layer formed on its surface, or an organic polymer such as polymethyl methacrylate (PMMA), polyvinyl alcohol (PVA), polyvinylphenol (PVP), polyethersulfone (PES), polyimide, polycarbonate, or polyethylene terephthalate (PET) (in the form of a polymer material, such as a plastic film, plastic sheet, or plastic substrate composed of a polymer material and having flexibility). The materials constituting the first substrate and the second substrate can be the same or different from each other. However, the second substrate is required to be transparent to the light emitted from the light-emitting element.

[0085] In the case of making the first electrode function as an anode electrode, examples of the material constituting the first electrode include metals having a high work function, such as platinum (Pt), gold (Au), silver (Ag), chromium (Cr), tungsten (W), nickel (Ni), copper (Cu), iron (Fe), cobalt (Co), or tantalum (Ta), or alloys thereof (for example, Ag-Pd-Cu alloy, Al-Nd alloy, or Al-Cu alloy containing silver as a main component and 0.3% to 1% by mass of palladium (Pd) and 0.3% to 1% by mass of copper (Cu). In addition, when using a conductive material having a small work function value and high light reflectivity, such as aluminum (Al) or an alloy containing aluminum, the first electrode can be used as an anode electrode by improving hole injection characteristics, for example, by arranging an appropriate hole injection layer. For example, the thickness of the first electrode can be 0.1 μm to 1 μm. Alternatively, in the case where a light reflecting layer described later is arranged, examples of the material constituting the first electrode include various transparent conductive materials, for example, the following transparent conductive materials as a base layer: indium oxide, indium tin oxide (ITO, including Sn-doped In2O3, crystalline ITO, and amorphous ITO), indium zinc oxide (IZO), indium gallium oxide (IGO), indium-doped gallium zinc oxide (IGZO, In-GaZnO4), IFO (F-doped In2O3), ITiO (Ti-doped In2O3), InSn, InSnZnO, tin oxide (SnO2), ATO (Sb-doped SnO2), FTO (F-doped SnO2), zinc oxide (ZnO), aluminum-doped zinc oxide (AZO), gallium-doped zinc oxide (GZO), B-doped ZnO, AlMgZnO (aluminum oxide and magnesium oxide-doped zinc oxide), antimony oxide, titanium oxide, NiO, spinel-type oxides, oxides having a YbFe2O4 structure, gallium oxide, titanium oxide, niobium oxide, nickel oxide, etc. Alternatively, the first electrode may have a structure obtained by stacking a transparent conductive material having excellent hole injection characteristics (such as indium and tin oxide (ITO) or indium and zinc oxide (IZO)) on a dielectric multilayer film or a reflective film having high light reflectivity (including aluminum (Al) or the like). At the same time, in the case of making the first electrode function as a cathode electrode, it is desirable that the first electrode be composed of a conductive material having a small work function value and high light reflectivity. However, by improving the electron injection characteristics, for example, by arranging an appropriate electron injection layer in a conductive material having high light reflectivity used as an anode electrode, the first electrode can also function as a cathode electrode.

[0086] In the case where the second electrode functions as a cathode electrode, it is desirable that the material constituting the second electrode (a semi-transparent material or a translucent material) be composed of a conductive material having a small work function value so as to be able to transmit emitted light and efficiently inject electrons into the organic layer (light-emitting layer). Examples of materials constituting the second electrode include metals having a small work function and alloys thereof, such as aluminum (Al), silver (Ag), magnesium (Mg), calcium (Ca), sodium (Na), strontium (Sr), alkali metals or alkaline earth metals and silver (Ag) (for example, alloys of magnesium (Mg) and silver (Ag) (Mg-Ag alloys)), magnesium-calcium alloys (Mg-Ca alloys), or alloys of aluminum (Al) and lithium (Li) (Al-Li alloys). Among these materials, Mg-Ag alloys are preferred, and the volume ratio between magnesium and silver can be, for example, Mg:Ag = 5:1 to 30:1. Alternatively, the volume ratio between magnesium and calcium can be, for example, Mg:Ca = 2:1 to 10:1. For example, the thickness of the second electrode may be 4 nm to 50 nm, preferably 4 nm to 20 nm, and more preferably 6 nm to 12 nm. Alternatively, the material constituting the second electrode may be at least one material selected from the group consisting of Ag-Nd-Cu, Ag-Cu, Au, and Al-Cu. Alternatively, the second electrode may have a stacked structure consisting of the material layer on the organic layer side described above and a so-called transparent electrode (for example, a thickness of 3×10 -8 m to 1×10 -6 m). A bus electrode (auxiliary electrode) composed of a low-resistance material (e.g., aluminum, aluminum alloy, silver, silver alloy, copper, copper alloy, gold, or gold alloy) can be arranged within the second electrode to reduce the overall resistance of the second electrode. The average light transmittance of the second electrode is 50% to 90%, preferably 60% to 90%. Furthermore, when the second electrode functions as an anode electrode, it is desirable that the second electrode be composed of a conductive material that transmits emitted light and has a large work function value.

[0087] Examples of methods for forming the first electrode or the second electrode include a combination of the following: vapor deposition methods including electron beam vapor deposition, hot wire vapor deposition, and vacuum vapor deposition, sputtering, chemical vapor deposition (CVD method), MOCVD method, and ion plating method with etching method; various printing methods, such as screen printing, inkjet printing, metal mask printing; plating method (electroplating or electroless plating); lift-off method; laser ablation method; and sol-gel method. According to various printing methods and plating methods, a first electrode or a second electrode having a desired shape (pattern) can be directly formed. Note that in the case where the second electrode is formed after the organic layer is formed, from the perspective of preventing damage to the organic layer, the second electrode is preferably formed specifically based on a film-forming method with small film-forming particle energy, such as vacuum vapor deposition method, or a film-forming method such as MOCVD method. When the organic layer is damaged, non-luminous pixels (or non-luminous sub-pixels) referred to as "black spots" may be generated due to the generation of leakage current.

[0088] The organic layer includes a light-emitting layer containing an organic light-emitting material. Specifically, for example, the organic layer can be constructed as a stacked structure of a hole transport layer, a light-emitting layer and an electron transport layer, a stacked structure of a hole transport layer and a light-emitting layer that also serves as an electron transport layer, a stacked structure of a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer and an electron injection layer. Examples of methods for forming the organic layer include physical vapor deposition (PVD) such as a vacuum vapor deposition method; a printing method such as a screen printing method or an inkjet printing method; a laser irradiation method, in which the laser absorption layer and the stacked structure of the organic layer formed on the transfer substrate are irradiated with a laser to separate the organic layer on the laser absorption layer and transfer the organic layer; and various coating methods. In the case of forming the organic layer based on the vacuum vapor deposition method, for example, using a so-called metal mask, the organic layer can be obtained by depositing a material that has passed through an opening arranged in the metal mask.

[0089] In the display device and the like of the present disclosure, an insulating layer and an interlayer insulating layer are formed. Examples of insulating materials constituting the insulating layer and the interlayer insulating layer include SiO-based X Materials (materials constituting silicon-based oxide films) such as SiO2, non-doped silicate glass (NSG), borophosphosilicate glass (BPSG), PSG, BSG, AsSG, SbSG, PbSG, spin-on glass (SOG), low-temperature oxide (LTO, low-temperature CVD-SiO2), low-melting-point glass or glass paste; SiN-based materials including SiON-based materials; SiOC; SiOF; and SiCN. Alternatively, examples of the material include inorganic insulating materials such as titanium oxide (TiO2), tantalum oxide (Ta2O5), aluminum oxide (Al2O3), magnesium oxide (MgO), chromium oxide (CrO x), zirconium oxide (ZrO2), niobium oxide (Nb2O5), tin oxide (SnO2) or vanadium oxide (VO x ). Alternatively, examples of insulating materials also include various resins, such as polyimide-based resins, epoxy-based resins, and acrylic resins; and low dielectric constant insulating materials, such as SiOCH, organic SOG, or fluorine-based resins (for example, materials having a dielectric constant k (=ε / ε0) of 3.5 or less, for example, specific examples of which include fluorocarbons, cycloperfluorocarbon polymers, benzocyclobutene, cyclic fluororesins, polytetrafluoroethylene, amorphous tetrafluoroethylene, polyaryl ether, aryl fluorinated ether, polyimide fluoride, amorphous carbon, polyparaxylene (polyparaxylene), and fullerene fluoride). Examples of insulating materials also include Silk (a trademark of Dow Chemical Co., a coated low dielectric constant interlayer insulating film material) and Flare (a trademark of Honeywell Electronic Materials, a polyallyl ether (PAE)-based material). In addition, these materials can be used alone or in appropriate combinations. In some cases, the substrate can be composed of the above-mentioned materials. The insulating layer, interlayer insulating layer and substrate can be formed using the following well-known methods, such as various CVD methods, various coating methods, various PVD methods including sputtering and vacuum vapor deposition methods, various printing methods such as screen printing, plating methods, electrodeposition methods, immersion methods, or sol-gel methods.

[0090] The display device and the like of the present disclosure including the above-mentioned various preferred modes and configurations can be constituted by an organic electroluminescent display device (organic EL display device). The light-emitting element can be constituted by an organic electroluminescent element (organic EL element).

[0091] In order to further improve the light extraction efficiency, the organic EL display device preferably has a resonator structure. Specifically, the light emitted from the light-emitting layer is resonated between the first interface composed of the interface between the first electrode and the organic layer (or in the structure in which the interlayer insulating layer is arranged under the first electrode and the light reflecting layer is arranged under the interlayer insulating layer, the first interface composed of the interface between the light reflecting layer and the interlayer insulating layer) and the second interface composed of the interface between the second electrode and the organic layer, and the second electrode emits a portion of the light. In addition, if the distance from the maximum emission position of the light-emitting layer to the first interface is represented by L1, its optical distance is represented by OL1, and the distance from the maximum emission position of the light-emitting layer to the second interface is represented by L2, its optical distance is represented by OL2, and m1 and m2 each represent an integer, satisfying the following formulas (1-1) and (1-2)

[0092] 0.7{-Φ1 / (2π)+m1}≤2×OL1 / λ≤1.2{-Φ1 / (2π)+m1} (1-1),

[0093] 0.7{-Φ2 / (2π)+m2}≤2×OL2 / λ≤1.2{-Φ2 / (2π)+m2} (1-2),

[0094] here,

[0095] λ: Maximum peak wavelength of the spectrum of light generated in the light-emitting layer (or a desired wavelength among the wavelengths of light generated in the light-emitting layer)

[0096] Φ1: Phase shift of light reflected on the first interface (unit: radian), assuming that -2π<Φ1≤0.

[0097] Φ2: Phase shift of light reflected on the second interface (unit: radian), assuming that -2π<Φ2≤0.

[0098] Here, the value of m1 is 0 or greater, and the value of m2 is 0 or greater independent of the value of m1. Examples of (m1, m2) include (m1, m2) = (0, 0), (m1, m2) = (0, 1), (m1, m2) = (1, 0), and (m1, m2) = (1, 1).

[0099] The distance L1 from the maximum emission position of the light-emitting layer to the first interface refers to the actual distance (physical distance) from the maximum emission position of the light-emitting layer to the first interface, and the distance L2 from the maximum emission position of the light-emitting layer to the second interface refers to the actual distance (physical distance) from the maximum emission position of the light-emitting layer to the second interface. In addition, this optical distance is also called the optical path length, and when the light passes through a medium with a refractive index of n and a distance of L, it usually means n×L. The same applies to the following description. Therefore, if the average refractive index is given by n ave If , then the following relationship is satisfied:

[0100] OL1=L1×n ave ,

[0101] OL2=L2×n ave .

[0102] Here, the average refractive index n ave It is obtained by adding the product of the refractive index and the thickness of each layer constituting the organic layer (or the organic layer, the first electrode, and the interlayer insulating layer), and dividing the resulting sum by the organic layer (or the organic layer, the first electrode, and the interlayer insulating layer).

[0103] The first electrode or light-reflecting layer and the second electrode absorb a portion of the incident light and reflect the rest. Therefore, a phase shift occurs in the reflected light. The phase shift amounts Φ1 and Φ2 can be determined by measuring the values ​​of the real part and the imaginary part of the complex refractive index of the materials constituting the first electrode or the light-reflecting layer and the second electrode, for example, using an ellipsometer, and performing calculations based on these values ​​(see, for example, "Principles of Optic," Max Born and Emil Wolf, 1974 (PERGAMONPRESS)). The refractive index of organic layers, interlayer insulating layers, etc. can also be determined using ellipsometer measurements.

[0104] Examples of materials constituting the light reflective layer include aluminum, aluminum alloys (e.g., Al-Nd or Al-Cu), Al / Ti stacked structures, Al-Cu / Ti stacked structures, chromium (Cr), silver (Ag), and silver alloys (e.g., Ag-Pd-Cu or Ag-Sm-Cu). For example, the light reflective layer can be formed by vapor deposition methods including electron beam vapor deposition, hot wire vapor deposition, and vacuum vapor deposition, sputtering, CVD, ion plating, plating (electroplating or electroless plating), lift-off, laser ablation, sol-gel methods, and the like.

[0105] As described above, in an organic EL display device having a resonator structure, a red light-emitting element, constructed by combining an organic layer emitting white light with a red color filter layer, causes red light emitted in the light-emitting layer to resonate, and red light (light with a spectral peak in the red region) is emitted from the second electrode. Furthermore, a green light-emitting element, constructed by combining an organic layer emitting white light with a green color filter layer, causes green light emitted in the light-emitting layer to resonate, and green light (light with a spectral peak in the green region) is emitted from the second electrode. Furthermore, a blue light-emitting element, constructed by combining an organic layer emitting white light with a blue color filter layer, causes blue light emitted in the light-emitting layer to resonate, and blue light (light with a spectral peak in the blue region) is emitted from the second electrode. In other words, each light-emitting element needs only to be designed by determining the desired wavelength λ (specifically, the wavelengths of red, green, and blue light) among the wavelengths of light generated by the light-emitting element and determining various parameters, such as OL1 and OL2, for each of the red, green, and blue light-emitting elements based on equations (1-1) and (1-2). For example, paragraph

[0041] of Japanese Patent Application Publication No. 2012-216495 discloses an organic EL element having a resonator structure using an organic layer as a resonant part, and describes that the film thickness of the organic layer is preferably greater than or equal to 80 nm and less than or equal to 500 nm, more preferably greater than or equal to 150 nm and less than or equal to 350 nm, because the distance from the light-emitting point (light-emitting surface) to the reflecting surface can be appropriately adjusted.

[0106] In an organic EL display device, the thickness of the hole transport layer (hole supply layer) and the thickness of the electron transport layer (electron supply layer) are expected to be substantially equal to each other. Alternatively, the thickness of the electron transport layer (electron supply layer) may be greater than the thickness of the hole transport layer (hole supply layer). As a result, electrons can be fully supplied to the light-emitting layer in the required amount with high efficiency at a low driving voltage. In other words, by arranging a hole transport layer between the first electrode corresponding to the anode electrode and the light-emitting layer, and forming a hole transport layer having a film thickness less than that of the electron transport layer, the supply of holes can be increased. In addition, this makes it possible to obtain a carrier balance without an excess or deficiency of holes and electrons, and the carrier supply is large enough. Therefore, a high luminous efficiency can be obtained. In addition, since there is no excess or deficiency of holes and electrons, the carrier balance hardly collapses, drive degradation is suppressed, and the emission life can be extended.

[0107] For example, the display device can be used as a monitoring device constituting a personal computer, or a monitoring device built into a television receiver, a mobile phone, a personal digital assistant (PDA), or a game console. Alternatively, the organic EL display device can be applied to an electronic viewfinder (EVF) or a head-mounted display (HMD). Alternatively, the organic EL display device can constitute an image display device, constituting an image display device in electronic paper (such as an electronic book or an electronic newspaper), a bulletin board (such as a sign, a poster, or a blackboard), rewritable paper that replaces printing paper, a display unit of a household appliance, a card display unit of a point card, etc., an electronic advertisement, or an electronic POP. The display device of the present disclosure can be used as a light-emitting device, and can constitute various lighting devices, including a backlight device and a planar light source device for a liquid crystal display device. The head-mounted display includes, for example,

[0108] (a) a frame mounted on the observer's head; and

[0109] (b) An image display device attached to the frame.

[0110] The image display device includes:

[0111] (A) a display device of the present disclosure; and

[0112] (B) An optical device into which light emitted from the display device of the present disclosure is incident and from which light is emitted.

[0113] The optical device includes:

[0114] (B-1) a light guide plate onto which light incident from the display device of the present disclosure is propagated by total internal reflection and then emitted toward an observer;

[0115] (B-2) a first deflecting device (for example, comprising a volume holographic diffraction grating film) that deflects light incident on the light guide plate so that the light incident on the light guide plate is totally reflected in the light guide plate; and

[0116] (B-3) A second deflecting device (for example, including a volume holographic diffraction grating film) that deflects light propagating in the light guide plate multiple times by total reflection so as to emit the light propagating in the light guide plate by total reflection from the light guide plate.

[0117] [First embodiment]

[0118] The first embodiment relates to a display device according to the first and second aspects of the present disclosure. Figure 1 (A) and Figure 2 (A) schematically shows the arrangement of the color filter layers in the display device of the first embodiment, and Figure 1 (B) and Figure 2 (B) shows the display device of the first embodiment along Figure 1 The conceptual cross-sectional view of arrow BB in (A). Figure 3 The arrangement of the light emitting areas in the display device of the first embodiment is schematically shown in FIG. Figure 4 , a conceptual cross-sectional view of the display device of the first embodiment is shown for explaining that color mixing is less likely to occur in the display device of the first embodiment. Figure 18 FIG. 4 is a schematic diagram showing a portion of a cross-sectional view of the display device of the first embodiment. Note that Figure 18 The display device is illustrated by ignoring the positional relationship between the color filter layer and the light-emitting region. Specifically, the display device of the first embodiment comprises an organic EL display device, and the light-emitting element comprises an organic EL element. Furthermore, the display device of the first embodiment is a top-emission display device that emits light from a second substrate, wherein the color filter layer is arranged on one side of the first substrate. In other words, the color filter layer has an on-chip color filter structure (OCCF structure).

[0119] The display device according to the first embodiment or the second to fourth embodiments described later is formed by arranging a plurality of light emitting element groups on a base 26, each light emitting element group including:

[0120] The first light emitting element 10R includes a first light emitting region 11R and a first color filter layer 51R disposed above the first light emitting region 11R;

[0121] a second light emitting element 10G including a second light emitting region 11G and a second color filter layer 51G disposed above the second light emitting region 11G; and

[0122] The third light-emitting element 10B includes a third light-emitting region 11B and a third color filter layer 51B disposed above the third light-emitting region 11B.

[0123] Furthermore, for the purpose of explaining the display device according to the first aspect of the present disclosure, in the display device of the first embodiment, in adjacent light-emitting elements, the shortest line segment (denoted by Figure 1 (B) and Figure 4 The angle (θ) formed by the color filter layer 51 and the normal to the substrate 26 (or the first substrate 41 or the second substrate 42) is the same in the light-emitting elements 10R, 10G, and 10B. In addition, for the purpose of illustrating the display device according to the second aspect of the present disclosure, in adjacent light-emitting elements, the distance (L) from the boundary line of the bottom surface of the color filter layer 51 facing the light-emitting region 11 to the orthogonal projection image of the substrate 26 (or the first substrate 41 or the second substrate 42) to the end of the light-emitting region 11 to the orthogonal projection image of the substrate 26 (or the first substrate 41 or the second substrate 42) is the same in the light-emitting elements 10R, 10G, and 10B. Note that in Figure 1 In (B), these orthogonal projection images are represented by alternating long dashed lines and short dashed lines.

[0124] Here, in the display device according to the first embodiment or the second and third embodiments described later, the area (S) of the orthogonal projection image of the top surface area of ​​the color filter layers 51R, 51G, 51B surrounded by the boundary line between the top surface (light emitting surface) of the color filter layers and the top surface (light emitting surface) of the color filter layers is top ) are the same in the first light emitting element 10R, the second light emitting element 10G, and the third light emitting element 10B. In addition, the areas (S) of the light emitting regions 11R, 11G, and 11B are the same as in the first light emitting element 10R, the second light emitting element 10G, and the third light emitting element 10B. EL-R ,S ER-G ,S EL-B ) are different between the first light emitting element 10R, the second light emitting element 10G and the third light emitting element 10B. Specifically, Figure 1 (B) Figure 5 (B) and (C) and Figure 13 (B) and (C) show that S EL-G EL-R EL-B .

[0125] Furthermore, in the display device according to the first embodiment or second to fourth embodiments described later, the first light emitting region 11R, the second light emitting region 11G, and the third light emitting region 11B emit white light.

[0126] ​​One pixel is composed of three light-emitting elements, namely a first light-emitting element 10R, a second light-emitting element 10G and a third light-emitting element 10B. The first substrate 41 includes color filter layers 51R, 51G and 51B. That is, the light-emitting regions 11R, 11G, 11B emit white light, and the light-emitting elements 10R, 10G, 10B are composed of a combination of light-emitting regions 11R, 11G, 11B emitting white light and color filter layers 51R, 51G, 51B. The organic layer 33 emits white light as a whole. For example, the number of pixels is 1920×1080. One light-emitting element (display element) constitutes one sub-pixel, and the number of light-emitting elements (specifically, organic EL elements) is three times the number of pixels. The first light-emitting element 10R includes a red color filter layer 51R and emits red light. The second light-emitting element 10G includes a green color filter layer 51G and emits green light. The third light-emitting element 10B includes a blue color filter layer 51B and emits blue light.

[0127] Furthermore, in the display device of the first embodiment, the first light-emitting elements 10R constituting the plurality of light-emitting element groups are arranged in the first direction, the second light-emitting elements 10G constituting the plurality of light-emitting element groups are arranged in the first direction, and the third light-emitting elements 10B constituting the plurality of light-emitting element groups are arranged in the first direction. That is, in the display device of the first embodiment, the light-emitting elements are arranged in a stripe pattern. That is, the sub-pixels are arranged in a stripe pattern.

[0128] In the display device according to the first embodiment or the second to fourth embodiments described later, specifically, each light emitting element includes:

[0129] First electrodes 31 (31R, 31G, 31B);

[0130] an organic layer 33 formed on the first electrode 31;

[0131] a second electrode 32 formed on the organic layer 33;

[0132] a protective layer (planarization layer) 34 formed on the second electrode 32; and

[0133] The color filter layers 51 (51R, 51G, 51B) are formed on the protective layer 34. In addition, light from the organic layer 33 is emitted to the outside via the second electrode 32, the protective layer 34, and the color filter layers 51.

[0134] Specifically, the first light-emitting element 10R emitting red light includes:

[0135] First electrode 31R;

[0136] an organic layer 33 formed on the first electrode 31R;

[0137] a second electrode 32 formed on the organic layer 33;

[0138] a protective layer (planarization layer) 34 formed on the second electrode 32; and

[0139] A color filter layer 51R is formed on the protective layer 34. In addition, the second light emitting element 10G emitting green light includes:

[0140] First electrode 31G;

[0141] an organic layer 33 formed on the first electrode 31G;

[0142] a second electrode 32 formed on the organic layer 33;

[0143] a protective layer (planarization layer) 34 formed on the second electrode 32; and

[0144] A color filter layer 51G is formed on the protective layer 34. In addition, the third light-emitting element 10B emitting blue light includes:

[0145] First electrode 31B;

[0146] an organic layer 33 formed on the first electrode 31B;

[0147] a second electrode 32 formed on the organic layer 33;

[0148] a protective layer (planarization layer) 34 formed on the second electrode 32; and

[0149] The color filter layer 51B is formed on the protective layer 34 .

[0150] First electrodes 31R, 31G, and 31B are arranged for the light-emitting elements 10R, 10G, and 10B, respectively. The second electrode 32 is arranged while being shared by the light-emitting elements 10R, 10G, and 10B. That is, the second electrode 32 is a so-called solid electrode. The first substrate 41 is arranged below the base 26 made of an insulating material, and the second substrate 42 is arranged above the top surface of the color filter layers 51R, 51G, and 51B. The light-emitting region 11 (11R, 11G, and 11B) formed by the first electrode 31 (31R, 31G, and 31B) and the organic layer 33 formed on the first electrode 31 are in contact with each other is arranged on the base 26. More specifically, the first electrode 31 (31R, 31G, and 31B) is formed on the base 26.

[0151] The light-emitting element driving unit is arranged below the substrate 26 containing SiON and is formed based on the CVD method. The light-emitting element driving unit can have a known circuit configuration. The light-emitting element driving unit is composed of a transistor (specifically, a MOSFET) formed on a silicon semiconductor substrate corresponding to the first substrate 41. The transistor 20 composed of a MOSFET includes a gate insulating layer 22 formed on the first substrate 41, a gate electrode 21 formed on the gate insulating layer 22, a source / drain region 24 formed on the first substrate 41, a channel formation region 23 formed between the source / drain region 24, and an element isolation region 25 surrounding the channel formation region 23 and the source / drain region 24. The transistor 20 is electrically connected to the first electrode 31 via a contact plug 27 arranged in the substrate 26. Note that one transistor 20 for one light-emitting element driving unit is shown in the drawings.

[0152] Furthermore, as described above, for each light-emitting element, a first electrode 31 is disposed on the substrate 26. Furthermore, an insulating layer 28 having an opening 29 is formed on the substrate 26, in which the first electrode 31 is exposed to the bottom, and an organic layer 33 is formed at least on the first electrode 31 exposed to the bottom of the opening 29. Specifically, the organic layer 33 is formed to cover the portion from the first electrode 31 exposed to the bottom of the opening 29 to the insulating layer 28, and the insulating layer 28 is formed to cover the portion from the first electrode 31 to the substrate 26. The actual light-emitting portion of the organic layer 33 is surrounded by the insulating layer 28. That is, the region of the organic layer 33 surrounded by the insulating layer 28 corresponds to the light-emitting region. The insulating layer 28 and the second electrode 32 are covered by a protective layer 34 containing SiN. The color filter layer 51 and the second substrate 42 are bonded to each other over the entire surface via a resin layer (sealing resin layer) 35 containing an acrylic adhesive.

[0153] The second electrode 32 is connected to the light emitting element driving unit via a contact hole (contact plug) (not shown) formed in the base 26 at the periphery of the display device. Note that an auxiliary electrode connected to the second electrode 32 may be arranged below the second electrode 32 at the periphery of the display device, and the auxiliary electrode may be connected to the light emitting element driving unit.

[0154] The first electrode 31 serves as an anode electrode, and the second electrode 32 serves as a cathode electrode. The first electrode 31 comprises a light-reflecting material, specifically an Al-Nd alloy. The second electrode 32 comprises a transparent conductive material, such as ITO. The first electrode 31 is formed using a combination of vacuum vapor deposition and etching. Furthermore, the film of the second electrode 32 is formed using a film-forming method with low-energy film-forming particles, such as vacuum vapor deposition. The first substrate 41 is formed from a silicon semiconductor substrate, and the second substrate 42 is formed from a glass substrate.

[0155] Incidentally, when forming the color filter layer, the color filter layer is generally composed of a photocurable resin to which a colorant containing a desired pigment or dye is added. Then, for example, the color filter layer is formed on the protective layer 34 based on the method described below. At present, the adhesion to the substrate becomes higher in the order of the material for forming the blue color filter layer 51B, the material for forming the red color filter layer 51R, and the material for forming the green color filter layer 51G.

[0156] Therefore, first, the green color filter layer 51G having the highest adhesion is formed on the protective layer 34. Specifically, a photosensitive material constituting the green color filter layer 51G is applied to the entire surface, and the resultant is exposed, baked, and developed to form the green color filter layer 51G having a desired pattern shape. Note that, as Figure 17A As shown, during the formation of the green color filter layer 51G, a cross section of the green color filter layer 51G obtained by applying a photosensitive material, exposing, baking, and developing has a side surface in an inverted tapered shape.

[0157] Subsequently, a photosensitive material constituting the red color filter layer 51R is applied to the entire surface, and the resultant is exposed, baked, and developed to form the red color filter layer 51R having a desired pattern shape. Figure 17B As shown, during the formation of the red filter layer 51R, the cross section of the red filter layer 51R obtained by applying a photosensitive material, exposing, baking, and developing has a side surface in an inverted tapered shape when the red filter layer 51R is not in contact with the green filter layer 51G. Figure 17C As shown, in the case where one side of the red filter layer 51R contacts the green filter layer 51G, the surface of one side has an inverted tapered shape, while the surface of the other side has a forward tapered shape. Figure 17G As shown, in the case where both sides of the red filter layer 51R are in contact with the green filter layer 51G, both side surfaces have a forward tapered shape.

[0158] Finally, a photosensitive material constituting the blue color filter layer 51B is applied to the entire surface, and the resultant is exposed, baked, and developed to form the blue color filter layer 51B having a desired pattern shape. Note that the blue color filter layer 51B is formed in an area where the green color filter layer 51G or the red color filter layer 51R is not formed. Figure 17D 、 Figure 17E or Figure 17F As shown, during the formation of the blue color filter layer 51B, a cross section of the blue color filter layer 51B obtained by applying a photosensitive material, exposing, baking, and developing has a side surface in a forward tapered shape.

[0159] In the display device of the first embodiment, the cross-sectional shapes of the green filter layer 51G, the red filter layer 51R, and the blue filter layer 51B are Figure 17F The cross-sectional shape shown (see Figure 1 (B) and Figure 2 (B)).

[0160] Here, as described above, in adjacent light emitting elements, the boundary line (also see Figure 4 521, 522 and 523 in FIG) and the end portions of the light emitting regions 11R, 11G, 11B (see also FIG). Figure 4 Reference numeral 11R R 、11R L , 11G R , 11G L , 11B R and 11B L ) (see also Figure 4 The angle (θ) formed by the dotted line in FIG1 and the normal to the base 26 (or the first substrate 41 or the second substrate 42) is the same in the light-emitting elements 10R, 10G, and 10B. In addition, the boundary line (see also FIG1 ) of the bottom surface of the color filter layers 51R, 51G, and 51B facing the light-emitting regions 11R, 11G, and 11B is the same as the boundary line (see also FIG1 ) of the color filter layers 51R, 51G, and 51B facing the light-emitting regions 11R, 11G, and 11B. Figure 4 521, 522 and 523 in the figure) to the orthogonal projection image of the base 26 (or the first substrate 41 or the second substrate 42) (also see Figure 4 The orthogonal projection image (also see the alternating long and short dash lines in FIG) to the ends of the light emitting regions 11R, 11G, and 11B to the base 26 (or the first substrate 41 or the second substrate 42) Figure 4 The distance (L) indicated by the alternating long and short dash lines in FIG. 1 ) is the same in the light-emitting elements 10R, 10G, and 10B.

[0161] like Figure 4 As schematically shown in FIG. 1 , when the second light emitting region 11G is viewed from the right end 11G R The emitted white light enters the boundary line 521 of the bottom surface between the green color filter layer 51G and the blue color filter layer 51B. Figure 4 When the blue filter layer 51B on the right side (see Figure 4 Similarly, when the sub-pixel initially displayed as green is displayed as blue from the right end 11B of the third light emitting region 11B, the sub-pixel initially displayed as green is displayed as blue. R The emitted white light enters the boundary line 522 with respect to the bottom surface between the blue filter layer 51B and the red filter layer 51R. Figure 4 When the red filter layer 51R on the right side (see Figure 4 Similarly, when the sub-pixel initially displayed as blue is displayed as red from the right end 11R of the first light emitting region 11R, the sub-pixel initially displayed as blue is displayed as red. RThe emitted white light enters the boundary line 523 with respect to the bottom surface between the red filter layer 51R and the green filter layer 51G. Figure 4 When the green filter layer 51G on the right side (see Figure 4 As shown by arrow R1 in FIG, the sub-pixel that was originally displayed as red is displayed as green.

[0162] In addition, when the left end 11B of the third light emitting region 11B is L The emitted white light enters relative to the boundary line 521 Figure 4 When the green filter layer 51G on the left side (see Figure 4 Similarly, when the sub-pixel initially displayed as blue is displayed as green from the left end 11R of the first light emitting region 11R, the sub-pixel initially displayed as blue is displayed as green. L The emitted white light enters relative to the boundary line 522 Figure 4 When the blue color filter layer 51B on the left side (see Figure 4 Similarly, when the sub-pixel initially displayed as red is displayed as blue from the left end 11G of the second light emitting region 11G, the sub-pixel initially displayed as red is displayed as blue. L The emitted white light enters relative to the boundary line 523 Figure 4 When the red filter layer 51R on the left (see Figure 4 As shown in the arrow G2 in FIG, the sub-pixel that was originally displayed as green is displayed as red.

[0163] In this way, for example, when Figure 4 When a pixel is viewed diagonally to the upper right of the line indicated by "A" in FIG, color mixing and color shift occur. However, the angle θ at which color mixing and color shift begin to occur is the same for red light-emitting element 10R, green light-emitting element 10G, and blue light-emitting element 10B. For example, when a pixel displays white, the angle θ at which color mixing and color shift begin to occur is the same for all light-emitting elements. Therefore, even when a pixel is viewed at an oblique angle greater than angle θ, it is observed as white, and color mixing and color shift do not occur.

[0164] In the case where the angles (θ) between the light emitting elements are different, for example, in the case where the angle (θ) in the green light emitting element is smaller than the angle (θ) of each of the red light emitting element and the blue light emitting element, for example, in the case where the angle θ at which color mixing and color shift begin to occur in the green light emitting element when a certain pixel displays white is the smallest, when the angle (θ) is greater than the angle θ, the angle (θ) is smaller than the angle (θ) of each of the red light emitting element and the blue light emitting element. G When a certain pixel is viewed at an oblique angle, the pixel that originally appeared white is observed as green, and color mixing and color shift occur.

[0165] As described above, in the display device according to the first embodiment or various embodiments described later, the angle (θ) formed by the shortest line segment connecting the boundary line of the bottom surface of the color filter layer and the end of the light-emitting region and the normal to the substrate (or the first substrate or second substrate described later) is the same in adjacent light-emitting elements, and the distance (L) from the orthogonal projection image of the boundary line of the bottom surface of the color filter layer on the substrate (or the first substrate or second substrate described later) to the orthogonal projection image of the end of the light-emitting region on the substrate (or the first substrate or second substrate described later) is the same in adjacent light-emitting elements. Therefore, since the difference in the behavior of light emitted from a certain light-emitting region and entering the color filter layer of adjacent light-emitting elements can be reduced, color shift and color mixing are less likely to occur.

[0166] In the first embodiment, the organic layer 33 has a stacked structure of a hole injection layer (HIL), a hole transport layer (HTL), a light-emitting layer, an electron transport layer (ETL), and an electron injection layer (EIL). The light-emitting layer is composed of at least two light-emitting layers emitting different colors, and the light emitted from the organic layer 33 is white. Specifically, the light-emitting layer has a three-layer stacked structure of a red light-emitting layer emitting red light, a green light-emitting layer emitting green light, and a blue light-emitting layer emitting blue light. The light-emitting layer can have a two-layer stacked structure of a blue light-emitting layer emitting blue light and a yellow light-emitting layer emitting yellow light, or a two-layer stacked structure of a blue light-emitting layer emitting blue light and an orange light-emitting layer emitting yellow-orange light. As described above, the red light-emitting element 10R for displaying red includes a red color filter layer 51R. The green light-emitting element 10G for displaying green includes a green color filter layer 51G. The blue light-emitting element 10B for displaying blue includes a blue color filter layer 51B. The red light emitting element 10R, the green light emitting element 10G, and the blue light emitting element 10B have the same configuration and structure except for the positional relationship between the color filter layers 51R, 51G, 51B and the light emitting regions 11R, 11G, 11B.

[0167] The hole injection layer improves hole injection efficiency and serves as a buffer layer to prevent leakage, and has a thickness of, for example, about 2 nm to 10 nm. The hole injection layer includes, for example, a hexaazabenzophenone derivative represented by the following formula (A) or (B). Note that contact between the end face of the hole injection layer and the second electrode is a major cause of variations in brightness between pixels, leading to degradation of displayed image quality.

[0168]

[0169] Here, R 1 to R 6Each independently represents a group selected from a hydrogen atom, a halogen atom, a hydroxyl group, an amino group, an amino group (arulamino group), a substituted or unsubstituted carbonyl group having 20 or less carbon atoms, a substituted or unsubstituted carbonyl ester group having 20 or less carbon atoms, a substituted or unsubstituted alkyl group having 20 or less carbon atoms, a substituted or unsubstituted alkenyl group having 20 or less carbon atoms, a substituted or unsubstituted alkoxy group having 20 or less carbon atoms, a substituted or unsubstituted aryl group having 30 or less carbon atoms, a substituted or unsubstituted heterocyclic group having 30 or less carbon atoms, a nitrile group, a cyano group, a nitro group or a silane group, and the adjacent R m (m=1 to 6) can be combined with each other in a ring structure. 1 To X 6 independently represents a carbon atom or a nitrogen atom.

[0170]

[0171] The hole transport layer improves the efficiency of hole transport to the light-emitting layer. When an electric field is applied to the light-emitting layer, electrons and holes recombine to generate light. The electron transport layer improves the efficiency of electron transport to the light-emitting layer, and the electron injection layer improves the efficiency of electron injection into the light-emitting layer.

[0172] The hole transport layer includes, for example, 4,4′,4″-tris(3-methylphenylphenylamino)triphenylamine (m-MTDATA) or α-naphthylphenyldiamine (αNPD) with a thickness of about 40 nm.

[0173] The light-emitting layer is a light-emitting layer that generates white light by color mixing, and is formed by laminating a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer as described above, for example.

[0174] In the red light-emitting layer, a portion of the holes injected from the first electrode 31 and a portion of the electrons injected from the second electrode 32 recombine by applying an electric field to generate red light. For example, such a red light-emitting layer includes at least one of a red light-emitting material, a hole transport material, an electron transport material, and a dual charge transport material. The red light-emitting material can be a fluorescent material or a phosphorescent material. A red light-emitting layer having a thickness of approximately 5 nm is formed, for example, by mixing 30% by mass of 2,6-bis[(4'-methoxydiphenylamino)phenylvinyl]-1,5-dicyanonaphthalene (BSN) with 4,4-bis(2,2-diphenylvinyl)biphenyl (DPVBi).

[0175] In the green light-emitting layer, upon application of an electric field, a portion of the holes injected from the first electrode 31 and a portion of the electrons injected from the second electrode 32 recombine to produce green light. For example, this green light-emitting layer comprises at least one of a green light-emitting material, a hole transport material, an electron transport material, and a dual charge transport material. The green light-emitting material can be a fluorescent material or a phosphorescent material. A green light-emitting layer having a thickness of approximately 10 nm is formed, for example, by mixing 5% by mass of coumarin 6 with DPVBi.

[0176] In the blue light-emitting layer, upon application of an electric field, a portion of the holes injected from the first electrode 31 and a portion of the electrons injected from the second electrode 32 recombine to produce blue light. For example, such a blue light-emitting layer comprises at least one of a blue light-emitting material, a hole transport material, an electron transport material, and a dual charge transport material. The blue light-emitting material can be a fluorescent material or a phosphorescent material. A blue light-emitting layer having a thickness of approximately 30 nm is formed, for example, by mixing 2.5% by mass of 4,4'-bis[2-{4-(N,N-diphenylamino)phenyl}vinyl]biphenyl (DPAVBi) with DPVBi.

[0177] For example, the electron transport layer with a thickness of about 20 nm includes 8-hydroxyquinoline aluminum (Alq3), and the electron injection layer with a thickness of about 0.3 nm includes, for example, LiF, Li2O, etc.

[0178] However, the materials constituting the layers are illustrative and are not limited to these materials. In addition, for example, the light-emitting layer may be composed of a blue light-emitting layer and a yellow light-emitting layer, or may be composed of a blue light-emitting layer and an orange light-emitting layer.

[0179] The light-emitting elements 10R, 10G, and 10B have a resonator structure using the organic layer 33 as a resonating portion. Note that in order to appropriately adjust the distance from the light-emitting surface to the reflective surface (specifically, the distance from the light-emitting surface to each of the first electrode 31 and the second electrode 32), the thickness of the organic layer 33 is preferably 8×10 -8 m or more and 5×10 -7 m or less, and more preferably 1.5×10 -7 m or more and 3.5×10 -7 m or less. In practice, in an organic EL display device having a resonator structure, the red light-emitting element 10R resonates the red light emitted from the light-emitting layer and emits red light (light having a spectral peak in the red region) from the second electrode 32. Furthermore, the green light-emitting element 10G resonates the green light emitted from the light-emitting layer and emits green light (light having a spectral peak in the green region) from the second electrode 32. Furthermore, the blue light-emitting element 10B resonates the blue light emitted from the light-emitting layer and emits blue light (light having a spectral peak in the blue region) from the second electrode 32.

[0180] Hereinafter, the Figure 18 The following is an overview of a method for manufacturing a light-emitting element according to the first embodiment.

[0181] [Step-100]

[0182] First, based on a known MOSFET manufacturing process, a light emitting element driving unit is formed on a silicon semiconductor substrate (first substrate 41 ).

[0183] [STEP-110]

[0184] Subsequently, the base 26 is formed on the entire surface thereof based on the CVD method.

[0185] [STEP-120]

[0186] Next, a connection hole is formed in the portion of the substrate 26 located above one of the source / drain regions of the transistor 20 using photolithography and etching techniques. Thereafter, a metal layer is formed on the substrate 26 including the connection hole, for example, using sputtering. Subsequently, the metal layer is patterned using photolithography and etching techniques, thereby forming the first electrode 31 on the substrate 26. The first electrode 31 is isolated for each light-emitting element. Simultaneously, a contact hole (contact plug) 27 for electrically connecting the first electrode 31 to the transistor 20 can be formed in the connection hole.

[0187] [STEP-130]

[0188] Next, for example, insulating layer 28 is formed on the entire surface by CVD. Thereafter, opening 29 is formed in a portion of insulating layer 28 on first electrode 31 by photolithography and etching. First electrode 31 is exposed at the bottom of opening 29.

[0189] [STEP-140]

[0190] Thereafter, for example, by a PVD method such as a vacuum vapor deposition method or a sputtering method, or a coating method such as a spin coating method or a die coating method, a film of the organic layer 33 is formed on the first electrode 31 and the insulating layer 28. Subsequently, for example, the second electrode 32 is formed on the entire surface based on a vacuum vapor deposition method or the like. In this way, the organic layer 33 and the second electrode 32 can be formed on the first electrode 31.

[0191] [STEP-150]

[0192] Thereafter, a protective layer 34 is formed on the entire surface by, for example, a CVD method or a PVD method. Then, as described above, the color filter layers 51R, 51G, 51B are formed on the protective layer 34. Finally, the second substrate 42 and the color filter layers 51R, 51G, 51B are bonded to each other via the resin layer (sealing resin layer) 35. In this way, a Figure 18 The organic EL display device shown.

[0193] [Second embodiment]

[0194] The second embodiment is a modification of the first embodiment. Figure 5 (A) and Figure 6 The arrangement of the color filter layers in the display device of the second embodiment is schematically shown in (A). Figure 5 (B) and Figure 6 (B) shows the Figure 5 A conceptual cross-sectional view of a display device of the second embodiment taken along arrows BB in (A). Figure 5 (C) and Figure 6 (C) shows the Figure 5 A conceptual cross-sectional view of a display device according to a second embodiment of the present invention is shown in FIG. Figure 5 (D) and Figure 6 (D) shows the Figure 5 A conceptual cross-sectional view of a display device according to a second embodiment of the present invention is shown in FIG. Figure 5 (E) and Figure 6 (E) shows the Figure 5 A conceptual cross-sectional view of a display device according to a second embodiment of the present invention is shown in FIG. Figure 7 The arrangement of the light emitting regions in the display device of the second embodiment is schematically shown in FIG. Figure 8 、 Figure 9 、 Figure 10 and Figure 11 , a conceptual cross-sectional view of the display device of the second embodiment for explaining that color mixing is less likely to occur in the display device of the second embodiment is shown in FIG. Figure 12A 、 Figure 12B and Figure 12C 2 shows the mechanism by which color mixing occurs in the display device of the second embodiment and the conventional display device.

[0195] In the display device of the second embodiment, the light emitting element group is composed of four light emitting elements arranged in a 2×2 pattern.

[0196] The first light emitting element 10R is arranged adjacent to the two third light emitting elements 10B.

[0197] The second light emitting element 10G is arranged adjacent to the two third light emitting elements 10B, and

[0198] Each of the two third light-emitting elements 10B is arranged adjacent to the first light-emitting element 10R and the second light-emitting element 10G. That is, in the display device of the second embodiment, the light-emitting elements are arranged in a diagonal arrangement. That is, the sub-pixels are arranged diagonally. The light-emitting element group occupies, for example, a rectangular area.

[0199] like Figure 5 (B) and (C) and Figure 8 and Figure 9 As shown, in the second embodiment and the first embodiment, in adjacent light emitting elements, the boundary lines 521 and 522 connecting the bottom surfaces of the color filter layers 51R, 51G, and 51B facing the light emitting regions 11R, 11G, and 11B and the end portions 11B of the light emitting regions 11R, 11G, and 11B are connected. R , 11G L , 11B R 、11R L The shortest line segment (given by Figure 5 (B) and Figure 8 and Figure 9 The angle (θ) formed by the base 26 (or the first substrate 41 or the second substrate 42) and the normal to the base 26 (or the first substrate 41 or the second substrate 42) is the same in the light-emitting elements 10R, 10G, and 10B. In addition, in adjacent light-emitting elements, the orthogonal projection image from the boundary lines 521 and 522 of the bottom surface of the color filter layers 51R, 51G, and 51B facing the light-emitting regions 11R, 11G, and 11B to the base 26 (or the first substrate 41 or the second substrate 42) to the end 11B of the light-emitting regions 11R, 11G, and 11B is the same. R , 11G L , 11B R 、11R L The distance (L) to the orthogonal projection image of the base 26 (or the first substrate 41 or the second substrate 42) is the same in the light emitting elements 10R, 10G, and 10B. Figure 5 (B) and Figure 8 and Figure 9 In , these orthogonal projection images are represented by alternating long dashed and short dashed lines.

[0200] In the display device of the second embodiment, the cross-sectional shapes of the green filter layer 51G, the red filter layer 51R, and the blue filter layer 51B are Figure 17D and Figure 17E The cross-sectional shape shown (see Figure 5 (B) and (C), Figure 6 (B) and (C) and Figure 8 and Figure 9 ).

[0201] The configuration and structure of the display device of the second embodiment other than the above-described points may be similar to those of the display device described in the first embodiment, and thus a detailed description thereof will be omitted.

[0202] like Figure 8 As schematically shown, when the right end 11B of the third light emitting region 11B is R The emitted white light enters the boundary line 521 of the bottom surface between the blue color filter layer 51B and the green color filter layer 51G. Figure 8 When the green filter layer 51G on the right is turned on, the sub-pixel that was originally displayed as blue is displayed as green. Figure 8 In FIG. 1 , this area is shown as “an area where color mixing occurs due to light from the third light emitting area.” Note that when the light from the right end 11B of the third light emitting area 11B R The emitted white light enters the boundary line 531 with respect to the top surface between the blue color filter layer 51B and the green color filter layer 51G. Figure 8 When the green filter layer 51G is on the right, the blue light from the sub-pixel originally displayed as blue is absorbed by the green filter layer 51G and is not emitted from the green filter layer 51G. Figure 8 In the diagram, this area is represented by "Area-A".

[0203] In addition, when the left end 11G of the second light emitting region 11G is L The emitted white light enters relative to the boundary line 521 Figure 8 When the blue filter layer 51B on the left is removed, the sub-pixel that was originally displayed as green is displayed as blue. Figure 8 In the figure, this area is shown as "an area where color mixing occurs by light from the second light-emitting area."

[0204] Similarly, if Figure 9 As schematically shown in FIG. 1 , when the right end 11B of the third light emitting region 11B is R The emitted white light enters the boundary line 522 with respect to the bottom surface between the blue filter layer 51B and the red filter layer 51R. Figure 9 When the red filter layer 51R on the right is turned on, the sub-pixel that was originally displayed as blue is displayed as red. Figure 9 In FIG. 1 , this area is shown as “an area where color mixing occurs due to light from the third light emitting area.” Note that when the light from the right end 11B of the third light emitting area 11B R The emitted white light enters the boundary line 532 with respect to the top surface between the blue color filter layer 51B and the red color filter layer 51R. Figure 9 When the red filter layer 51R on the right is turned on, the blue light from the sub-pixel originally displayed as blue is absorbed by the red filter layer 51R and is not emitted from the red filter layer 51R. Figure 9 In the diagram, this area is indicated by "Area-B".

[0205] In addition, when the left end 11R of the first light emitting region 11R is L The emitted white light enters relative to the boundary line 521 Figure 9 When the blue filter layer 51B on the left is removed, the sub-pixel that was originally displayed as red is displayed as blue. Figure 9 In the figure, this area is displayed as "an area where color mixing occurs by light from the first light-emitting area."

[0206] In this way, for example, when Figure 8 and Figure 9 When a certain pixel is viewed from the upper left of the diagonal line indicated by "A" in FIG, color mixing and color shift occur. However, the angle θ at which color mixing and color shift begin to occur is the same for the red light-emitting element 10R and the green light-emitting element 10G. For example, when a certain pixel displays white, the angle θ at which color mixing and color shift begin to occur is the same for each light-emitting element. Therefore, even when a certain pixel is viewed at an oblique angle greater than the angle θ, the pixel is observed as being displayed white, and therefore color mixing and color shift do not occur (see FIG. Figure 12A ). In addition, color mixing can be prevented. Therefore, when monochromatic light is emitted from a pixel, the color purity increases and the chromaticity point is darker. Therefore, the color gamut is widened, and the range of color representation of the display device is widened.

[0207] Figure 10 1B and 1G respectively pass through the blue filter layer 51B and the green filter layer 51G. In addition, Figure 11 1B shows the Z attenuation angle and the X attenuation angle when the white light emitted from the third light emitting region 11B and the white light emitted from the first light emitting region 11R pass through the blue color filter layer 51B and the red color filter layer 51R, respectively. Figure 12B Schematically showing the relationship between the viewing angle and the relative intensities of X, Y, and Z, however, in the display device of the second embodiment, changes in the relative intensities of X, Y, and Z are identical to each other, and color mixture and color shift do not occur.

[0208] exist Figure 22 (A) schematically shows the arrangement of the color filter layers in a conventional display device, and Figure 22 (B) shows the Figure 22 A conceptual cross-sectional view of a conventional display device as shown in FIG. Figure 231 and 2 show various conceptual cross-sectional views of a conventional display device for explaining the occurrence of color mixing in the conventional display device. In the conventional display device, the area (S) of the orthogonal projection image of the top surface area of ​​the color filter layers 51R, 51G, and 51B surrounded by the boundary line between the top surface (light emitting surface) of the color filter layers 51R, 51G, and 51B on the base 26 (or the first substrate 41 or the second substrate 42) is top ), which is the same in the first light-emitting element, the second light-emitting element, and the third light-emitting element. In addition, the areas of the light-emitting regions 111R, 111G, and 111B are also the same. Therefore, inevitably, the angle (θ) formed by the shortest line segment connecting the boundary line of the bottom surface of the color filter layers 51R, 51G, and 51B facing the light-emitting regions 111R, 111G, and 111B and the end of the light-emitting regions 111R, 111G, and 111B and the normal line of the base 26 (or the first substrate 41 or the second substrate 42) is R-1 ,θ R-2 ,θ G-1 ,θ G-2 ,θ B-1 ,θ B-2 ) differs between the light-emitting elements, and in adjacent light-emitting elements, the distance (L) from the boundary line of the bottom surface of the color filter layers 51R, 51G, 51B facing the light-emitting regions 111R, 111G, 111B to the orthogonal projection image of the base 26 (or the first substrate 41 or the second substrate 42) to the end of the light-emitting region to the orthogonal projection image of the base 26 (or the first substrate 41 or the second substrate 42) R-1 ,L R-2 ,L G-1 ,L G-2 ,L B-1 ,L B-2 ) differs between light-emitting elements.

[0209] like Figure 23 As schematically shown in FIG. 1 , when the second light emitting region 11G is viewed from the right end 11G R The emitted white light enters the boundary line 521 of the bottom surface between the green color filter layer 51G and the blue color filter layer 51B. Figure 23 When the blue filter layer 51B on the right side (see Figure 23 Similarly, when the sub-pixel initially displayed as green is displayed as blue from the right end 11B of the third light emitting region 11B, the sub-pixel initially displayed as green is displayed as blue. R The emitted white light enters the boundary line 522 with respect to the bottom surface between the blue filter layer 51B and the red filter layer 51R. Figure 23 When the red filter layer 51R on the right side (see Figure 23 Similarly, when the sub-pixel initially displayed as blue is displayed as red from the right end 11R of the first light emitting region 11R, the sub-pixel initially displayed as blue is displayed as red. RThe emitted white light enters the boundary line 523 with respect to the bottom surface between the red filter layer 51R and the green filter layer 51G. Figure 23 When the green filter layer 51G on the right side (see Figure 23 As shown by arrow R1 in FIG, the sub-pixel that was originally displayed as red is displayed as green.

[0210] In addition, when the left end 11B of the third light emitting region 11B is L The emitted white light enters relative to the boundary line 521 Figure 23 When the green filter layer 51G on the left side (see Figure 23 Similarly, when the sub-pixel initially displayed as blue is displayed as green from the left end 11R of the first light emitting region 11R, the sub-pixel initially displayed as blue is displayed as green. L The emitted white light enters relative to the boundary line 522 Figure 23 When the blue color filter layer 51B on the left side (see Figure 23 Similarly, when the sub-pixel initially displayed as red is displayed as blue from the left end 11G of the second light emitting region 11G, the sub-pixel initially displayed as red is displayed as blue. L The emitted white light enters relative to the boundary line 523 Figure 23 When the red filter layer 51R on the left (see Figure 23 As shown in the arrow G2 in FIG, the sub-pixel that was originally displayed as green is displayed as red.

[0211] In this way, for example, when Figure 23 When a certain pixel is viewed from the upper right of the diagonal line indicated by "A" in FIG, color mixing and color shift occur. However, the angle θ at which color mixing and color shift begin to occur is different between the red light-emitting element 10R, the green light-emitting element 10G, and the blue light-emitting element 10B. For example, when a certain pixel displays white, the angle θ at which color mixing and color shift begin to occur is the smallest in the green light-emitting element 10G. Therefore, when the certain pixel is viewed at an oblique angle greater than the angle θ, the pixel that appears to be white is observed as green, and color mixing and color shift occur (see FIG. Figure 12A and Figure 12C ).

[0212] [Third embodiment]

[0213] The third embodiment is a modification of the first embodiment. Figure 13 (A) and Figure 14 The arrangement of the color filter layers in the display device of the third embodiment is schematically shown in (A). Figure 13 (B) and Figure 14 (B) shows the Figure 5 A conceptual cross-sectional view of a display device according to a third embodiment is shown in FIG. 1 , taken along arrow BB in FIG. 2 . Figure 13 (C) and Figure 14 (C) shows the Figure 5 A conceptual cross-sectional view of a display device according to a third embodiment is shown in FIG. Figure 13 (D) and Figure 14 (D) shows the Figure 5 A conceptual cross-sectional view of a display device according to a third embodiment is shown in FIG. 1 , taken along arrow DD in FIG. Figure 13 (E) and Figure 14 (E) shows the Figure 5 A conceptual cross-sectional view of a display device according to a third embodiment is shown in FIG. Figure 15 Schematically shows the arrangement of the light-emitting areas in the display device of the third embodiment.

[0214] In the display device of the third embodiment, the light emitting element group is composed of a first light emitting element 10R, a second light emitting element 10G, and a third light emitting element 10B.

[0215] The first light emitting element 10R is arranged adjacent to the second light emitting element 10G and the third light emitting element 10B, and

[0216] The second light emitting element 10G is arranged adjacent to the first light emitting element 10R and the third light emitting element 10B. Note that the light emitting element group occupies, for example, a rectangular area.

[0217] like Figure 13 As shown in (B), (C) and (E) of FIG. 1 , in the third embodiment and the first embodiment, in adjacent light-emitting elements, the shortest line segment (denoted by the boundary line connecting the bottom surface of the color filter layers 51R, 51G, 51B facing the light-emitting regions 11R, 11G, 11B) and the end portions of the light-emitting regions 11R, 11G, 11B) is formed. Figure 13 The angle (θ) formed by the normal to the base 26 (or the first substrate 41 or the second substrate 42) is the same in the light-emitting elements 10R, 10G, and 10B. In addition, in adjacent light-emitting elements, the distance (L) from the boundary line of the bottom surface of the color filter layer 51R, 51G, 51B facing the light-emitting region 11R, 11G, 11B to the orthogonal projection image of the base 26 (or the first substrate 41 or the second substrate 42) to the end of the light-emitting region 11R, 11G, 11B to the orthogonal projection image of the base 26 (or the first substrate 41 or the second substrate 42) is the same in the light-emitting elements 10R, 10G, and 10B. Note that in Figure 13 In (B), (C) and (E), these orthogonal projection images are represented by alternating long dashed lines and short dashed lines.

[0218] In the display device of the third embodiment, the cross-sectional shapes of the green filter layer 51G, the red filter layer 51R, and the blue filter layer 51B are Figure 17D 、 Figure 17E and Figure 17G The cross-sectional shape shown (see Figure 13 (B) and (C) and Figure 14 (B)).

[0219] Since the discussion regarding color mixing and color shift in each light-emitting element in the third embodiment is substantially similar to that in the second embodiment, a detailed description thereof will be omitted. Furthermore, other than the above-mentioned points, the configuration and structure of the display device of the third embodiment can be similar to those of the display device described in the second embodiment, and a detailed description thereof will be omitted.

[0220] [Fourth embodiment]

[0221] The fourth embodiment is a modification of the first embodiment. Figure 16 (A) schematically shows the arrangement of the color filter layers in the display device of the fourth embodiment, and Figure 16 (B) shows the Figure 16 1 is a conceptual cross-sectional view of the display device of the fourth embodiment taken along arrows BB in (A).

[0222] In the display device of the fourth embodiment, the area (S) of the orthogonal projection image of the top surface area of ​​the color filter layers 51R, 51G, and 51B surrounded by the boundary line between the top surface (light emitting surface) of the color filter layers 51R, 51G, and 51B on the base 26 (or the first substrate 41 or the second substrate 42) is top-R ,S top-G ,S top-B ) are different between the first light emitting element 10R, the second light emitting element 10G, and the third light emitting element 10B. In addition, the areas (S EL-R ,S EL-G ,S EL-B ) are the same in the first light-emitting element 10R, the second light-emitting element 10G, and the third light-emitting element 10B.

[0223] like Figure 16 As shown in (B), in the fourth embodiment and the first embodiment, in the adjacent light emitting elements 10R, 10G, and 10B, the boundary line connecting the bottom surface of the color filter layers 51R, 51G, and 51B facing the light emitting regions 11R, 11G, and 11B and the shortest line segment (denoted by Figure 16The angle (θ) formed by the normal to the base 26 (or the first substrate 41 or the second substrate 42) is the same in the light-emitting elements 10R, 10G, and 10B. In addition, in adjacent light-emitting elements, the distance (L) from the boundary line of the bottom surface of the color filter layer 51R, 51G, 51B facing the light-emitting region 11R, 11G, 11B to the orthogonal projection image of the base 26 (or the first substrate 41 or the second substrate 42) to the end of the light-emitting region 11R, 11G, 11B to the orthogonal projection image of the base 26 (or the first substrate 41 or the second substrate 42) is the same in the light-emitting elements 10R, 10G, and 10B. Note that in Figure 16 In (B), these orthogonal projection images are represented by alternating long dashed lines and short dashed lines.

[0224] In addition, the centers of the top surface areas of the color filter layers 51R, 51G, and 51B surrounded by the boundary line between the top surface (light-emitting surface) of the color filter layers and the top surface (light-emitting surface) of the color filter layers, and the centers of the light-emitting areas 11R, 11G, and 11B do not overlap with each other when viewed from the normal direction of the substrate.

[0225] Since the discussion of color mixing and color shift in each light-emitting element in the fourth embodiment is substantially similar to that in the first embodiment, a detailed description thereof will be omitted. Furthermore, other than the aforementioned points, the configuration and structure of the display device of the fourth embodiment can be similar to those described in the first embodiment, and a detailed description thereof will be omitted. It goes without saying that the configuration and structure of the display device of the fourth embodiment can be applied to the display devices described in the second and third embodiments.

[0226] So far, the present disclosure has been described based on the preferred embodiments. However, the present disclosure is not limited to these embodiments. The configuration and structure of the display device (organic EL display device) and the light-emitting element (organic EL element) described in the embodiments are illustrative and can be appropriately changed. The method for manufacturing the display device is also illustrative and can be appropriately changed. In the embodiment, one pixel is composed of only three sub-pixels formed by a combination of a white light-emitting element and a color filter layer. However, for example, one pixel can be formed by four sub-pixels obtained by adding a light-emitting element that emits white light. In this case, only the three light-emitting elements other than the light-emitting element that emits white light are required to meet the requirements of the display device according to the first and second aspects of the present disclosure.

[0227] Alternatively, the first light-emitting region 11R may emit red light, the second light-emitting region 11G may emit green light, and the third light-emitting region 11B may emit blue light. That is, as light-emitting elements, a light-emitting element that generates red light from an organic layer, a light-emitting element that generates green light from an organic layer, and a light-emitting element that generates blue light from an organic layer may be used, and a pixel may be formed by joining these three light-emitting elements (sub-pixels). Even in a display device having such a configuration, a color filter layer is provided for the purpose of improving color purity, etc., so color mixing and color shift may occur.

[0228] like Figure 19 Schematically showing the arrangement of the light emitting regions 11R, 11G, and 11B as a modification in the display device of the second embodiment, the planar shape of each of the first light emitting region 11R and the second light emitting region 11G may also be a shape in which two corners are cut off. Note that Figure 19 It is a diagram for illustrating only the cutouts in the first light emitting region 11R, the second light emitting region 11G, and the third light emitting region 11B, and illustrates the light emitting regions by ignoring the relationship between the sizes of the light emitting regions.

[0229] The color filter layers 51R, 51G, and 51B may be formed on the surface side of the second substrate 42 facing the first substrate 41. In this case, the vertical arrangement of the color filter layers 51R, 51G, and 51B is reversed from the vertical arrangement of the color filter layers 51R, 51G, and 51B described in each embodiment. Figure 1 In the first embodiment shown, when viewed from the side of the first substrate, the blue color filter layer 51B has an inverted tapered shape, and the green color filter layer 51G has a forward tapered shape. Even in this case, the display device needs to meet the requirements of the display devices according to the first and second aspects of the present disclosure. This also applies to the display devices of the other embodiments.

[0230] In the boundary region between adjacent color filter layers 51R, 51G, and 51B, a structure (transparent resin layer) made of a transparent resin may be arranged in the bottom region including the bottom surface of the color filter layer. In this mode, the boundary line of the bottom surface of the color filter layers 51R, 51G, and 51B facing the light-emitting regions 11R, 11G, and 11B is located on the structure.

[0231] In this embodiment, the light emitting element driving unit is composed of MOSFET, but may also be composed of TFT. The first electrode and the second electrode may each have a single-layer structure or a multi-layer structure.

[0232] A light-shielding layer can be arranged between the light-emitting elements to prevent light emitted from a certain light-emitting element from entering a light-emitting element adjacent to the light-emitting element, thereby causing optical crosstalk. In other words, a groove can be formed between the light-emitting elements, and the groove can be filled with a light-shielding material to form a light-shielding layer. By arranging the light-shielding layer in this manner, the ratio of light emitted from a certain light-emitting element entering an adjacent light-emitting element can be reduced, and the occurrence of color mixing and the chromaticity of the entire pixel shifting from the desired chromaticity can be suppressed. Specific examples of light-shielding materials constituting the light-shielding layer include materials capable of light shielding, such as titanium (Ti), chromium (Cr), tungsten (W), tantalum (Ta), aluminum (Al) or MoSi2. The light-shielding layer can be formed by the following methods: vapor deposition methods including electron beam vapor deposition, hot wire vapor deposition and vacuum vapor deposition, sputtering, CVD method, ion plating method, etc.

[0233] The display device of the present disclosure may be applied to a single-lens reflex digital still camera with interchangeable lenses. Figure 20A shows a front view of a digital still camera, Figure 20B A rear view thereof is shown. Such a single-lens reflex digital still camera with interchangeable lenses has, for example, an interchangeable imaging lens unit (interchangeable lens) 212 on the right front side of a camera body 211, and a grip portion 213 to be gripped by an imaging person on the left front side thereof. In addition, a monitor 214 is arranged substantially at the center of the rear surface of the camera body 211. An electronic viewfinder (eyepiece window) 215 is arranged above the monitor 214. By looking through the electronic viewfinder 215, the imaging person can visually confirm the image of the subject guided from the imaging lens unit 212 and determine the composition. In a single-lens reflex digital still camera with interchangeable lenses having such a configuration, the display device of the present disclosure can be used as the electronic viewfinder 215.

[0234] Alternatively, the display device of the present disclosure may be applied to a head-mounted display. Figure 21As shown in the external view, the head-mounted display 300 is a transmissive head-mounted display comprising a main body 301, an arm 302, and a lens barrel 303. The main body 301 is connected to the arm 302 and glasses 310. Specifically, the longitudinal end of the main body 301 is connected to the arm 302. Furthermore, one side of the main body 301 is connected to the glasses 310 via a connecting member (not shown). Note that the main body 301 can be worn directly on a person's head. The main body 301 has a control substrate for controlling the operation of the head-mounted display 300 and a built-in display unit. The arm 302 supports the lens barrel 303 relative to the main body 301 by connecting the main body 301 to the lens barrel 303. Specifically, the arm 302 secures the lens barrel 303 to the main body 301 by joining the ends of the main body 301 and the ends of the lens barrel 303. The arm 302 also has a built-in signal line for transmitting data related to the image provided from the main body 301 to the lens barrel 303. The lens barrel 303 projects image light supplied from the body 301 via the arm 302 to the eyes of the user wearing the head-mounted display 300 through the lens 311 of the glasses 310. In the head-mounted display 300 having the above configuration, the display device of the present disclosure can be used as a display unit built into the body 301.

[0235] In the case of arranging a resonator structure, the light reflection layer 37 can be formed below the first electrode 31 (on the side of the first substrate 41). That is, when the light reflection layer 37 is arranged on the base 26 and the first electrode 31 is arranged on the interlayer insulating layer 38 covering the light reflection layer 37, it is only necessary to form each of the first electrode 31, the light reflection layer 37, and the interlayer insulating layer 38 from the above-mentioned materials. The light reflection layer 37 may be connected to the contact hole (contact plug) 27, or it is not necessary to be connected to the contact hole (contact plug) 27.

[0236] In the following, reference Figure 24A (First example), Figure 24B (Second example), Figure 25A (Third Example), Figure 25B (Fourth Example), Figure 26A (Fifth Example), Figure 26B (Sixth Example), Figure 27A (Seventh Example) and Figure 27B and Figure 27C(Eighth Example) The resonator structure will be described based on the first to eighth examples. Here, in the first to fourth examples and the seventh example, the thickness of the first electrode is the same in the light-emitting portion, and the thickness of the second electrode is the same in the light-emitting portion. Meanwhile, in the fifth and sixth examples, the thickness of the first electrode is different in the light-emitting portion, and the thickness of the second electrode is the same in the light-emitting portion. In addition, in the eighth example, the thickness of the first electrode can be different in the light-emitting portion, or the same in the light-emitting portion, and the thickness of the second electrode is the same in the light-emitting portion.

[0237] Note that in the following description, light-emitting portions constituting the first light-emitting element 101, the second light-emitting element 102, and the third light-emitting element 103 are denoted by reference numerals 301, 302, and 303, respectively; first electrodes are denoted by reference numerals 311, 312, and 313; second electrodes are denoted by reference numerals 321, 322, and 323; organic layers are denoted by reference numerals 331, 332, and 333; light-reflecting layers are denoted by reference numerals 371, 372, and 373; and interlayer insulating layers are denoted by reference numerals 381, 382, ​​383, 381′, 382′, and 383′. In the following description, the materials used are illustrative only and may be modified as appropriate.

[0238] In the illustrated example, the resonator lengths of the first light-emitting element 101, the second light-emitting element 102, and the third light-emitting element 103 derived from equations (1-1) and (1-2) become shorter in the order of the first light-emitting element 101, the second light-emitting element 102, and the third light-emitting element 103. However, the present disclosure is not limited thereto, and the optimal resonator length only needs to be determined by appropriately setting the values ​​of m1 and m2.

[0239] Figure 24A A conceptual diagram showing a light emitting element having a first example of a resonator structure, Figure 24B A conceptual diagram showing a light emitting element of a second example having a resonator structure, Figure 25A A conceptual diagram showing a light emitting element of a third example having a resonator structure, and Figure 25B A conceptual diagram illustrating a light-emitting element having a fourth example of a resonator structure. In some of the first to sixth and eighth examples, interlayer insulating layers 38 and 38' are formed below the first electrode 31 of the light-emitting portion 30, and a light-reflecting layer 37 is formed below the interlayer insulating layers 38 and 38'. In the first to fourth examples, the thickness of the interlayer insulating layers 38 and 38' varies in the light-emitting portions 301, 302, and 303. Furthermore, by appropriately setting the thickness of the interlayer insulating layers 381, 382, ​​383, 381', 382', and 383', it is possible to set an optical distance that optimally resonates with respect to the emission wavelength of the light-emitting portion 30.

[0240] In the first example, the first interfaces (indicated by dashed lines in the figure) are at the same level in the light-emitting sections 301, 302, and 303, while the second interfaces (indicated by alternating long dashed and short dashed lines in the figure) are at different levels in the light-emitting sections 301, 302, and 303. Furthermore, in the second example, the first interfaces are at different levels among the light-emitting sections 301, 302, and 303, while the second interfaces are at the same level among the light-emitting sections 301, 302, and 303.

[0241] In the second example, the interlayer insulating layers 381', 382', and 383' are composed of an oxide film, wherein the surface of the light reflecting layer 37 is oxidized. The interlayer insulating layer 38' composed of an oxide film depends on the material of the light reflecting layer 37 and may be composed of, for example, aluminum oxide, tantalum oxide, titanium oxide, magnesium oxide, zirconium oxide, or the like. Oxidation of the surface of the light reflecting layer 37 can be performed, for example, by the following method. Specifically, the first substrate 41, on which the light reflecting layer 37 is formed, is immersed in an electrolyte solution filled in a container. Furthermore, a cathode is positioned facing the light reflecting layer 37. The light reflecting layer 37 is then anodized with the light reflecting layer 37 serving as the anode. The thickness of the oxide film obtained by anodization is proportional to the potential difference between the light reflecting layer 37 serving as the anode and the cathode. Therefore, the light reflecting layers 371, 372, and 373 are anodized while voltages corresponding to the light emitting portions 301, 302, and 303 are applied to the light reflecting layers 371, 372, and 373, respectively. This enables the interlayer insulating layers 381', 382', and 383' composed of oxide films having different thicknesses to be formed together on the surface of the light reflecting layer 37. The thicknesses of the light reflecting layers 371, 372, 373 and the thicknesses of the interlayer insulating layers 381', 382', 383' are different between the light emitting portions 301, 302, and 303.

[0242] In the third example, the base film 39 is arranged below the light reflecting layer 37, and the thickness of the base film 39 is different between the light emitting portions 301, 302, and 303. That is, in the illustrated example, the thickness of the base film 39 becomes thicker in the order of the light emitting portion 301, the light emitting portion 302, and the light emitting portion 303.

[0243] In the fourth example, the thickness of the light-reflecting layers 371, 372, and 373 at the time of film formation is different in the light-emitting sections 301, 302, and 303. In the third and fourth examples, the second interface is at the same level in the light-emitting sections 301, 302, and 303, while the first interface is at different levels among the light-emitting sections 301, 302, and 303.

[0244] In the fifth and sixth examples, the thicknesses of the first electrodes 311, 312, and 313 are different in the light emitting portions 301, 302, and 303. In the light emitting portion 30, the thickness of the light reflecting layer 37 is the same.

[0245] In the fifth example, the first interface is at the same level in the light emitting portions 301 , 302 , and 303 , while the second interface is at different levels among the light emitting portions 301 , 302 , and 303 .

[0246] In the sixth example, the base film 39 is disposed below the light-reflecting layer 37, and the thickness of the base film 39 varies among the light-emitting sections 301, 302, and 303. That is, in the illustrated example, the thickness of the base film 39 increases in the order of the light-emitting section 301, the light-emitting section 302, and the light-emitting section 303. In the sixth example, the second interface is at the same level among the light-emitting sections 301, 302, and 303, while the first interface is at different levels among the light-emitting sections 301, 302, and 303.

[0247] In the seventh example, the first electrodes 311, 312, and 313 also function as light-reflecting layers, and the optical constants (specifically, the amount of phase shift) of the materials constituting the first electrodes 311, 312, and 313 differ between the light-emitting portions 301, 302, and 303. For example, only the first electrode 311 of the light-emitting portion 301 needs to be formed of copper (Cu), and only the first electrode 312 of the light-emitting portion 302 and the first electrode 313 of the light-emitting portion 303 need to be formed of aluminum (Al).

[0248] In addition, in the eighth example, the first electrodes 311 and 312 also function as light-reflecting layers, and the optical constants (specifically, the amount of phase shift) of the materials constituting the first electrodes 311 and 312 differ between the light-emitting portions 301 and 302. For example, it is only necessary that the first electrode 311 of the light-emitting portion 301 be made of copper (Cu), and the first electrode 312 of the light-emitting portion 302 and the first electrode 313 of the light-emitting portion 303 be made of aluminum (Al). In the eighth example, for example, the seventh example is applied to the light-emitting portions 301 and 302, and the first example is applied to the light-emitting portion 303. The thicknesses of the first electrodes 311, 312, and 313 may be different from or the same as each other.

[0249] Note that the present disclosure can have the following configurations.

[0250] [A01] Display Device: First Aspect

[0251] A display device is formed by arranging a plurality of light-emitting element groups on a substrate, each light-emitting element group comprising:

[0252] A first light-emitting element includes a first light-emitting region and a first color filter layer arranged above the first light-emitting region;

[0253] a second light-emitting element comprising a second light-emitting region and a second color filter layer disposed above the second light-emitting region; and

[0254] The third light-emitting element includes a third light-emitting region and a third color filter layer arranged above the third light-emitting region, wherein

[0255] In adjacent light emitting elements, an angle formed by the shortest line segment connecting the boundary line of the bottom surface of the color filter layer facing the light emitting region and the end of the light emitting region and the normal to the substrate is the same in the light emitting elements.

[0256] [A02] Display Device: Second Aspect

[0257] A display device is formed by arranging a plurality of light-emitting element groups on a substrate, each light-emitting element group comprising:

[0258] A first light-emitting element includes a first light-emitting region and a first color filter layer arranged above the first light-emitting region;

[0259] a second light-emitting element comprising a second light-emitting region and a second color filter layer disposed above the second light-emitting region; and

[0260] The third light-emitting element includes a third light-emitting region and a third color filter layer arranged above the third light-emitting region, wherein

[0261] In adjacent light-emitting elements, the distance from the boundary line of the bottom surface of the color filter layer facing the light-emitting region to the orthogonal projection image on the substrate to the end of the light-emitting region to the orthogonal projection image on the substrate is the same in the light-emitting elements.

[0262] [A03] A display device according to [A01] or [A02], wherein the area of ​​the orthogonal projection image of the top surface area of ​​the color filter layer surrounded by the boundary line between the top surface of the color filter layer and the top surface of the color filter layer is the same in the first light-emitting element, the second light-emitting element, and the third light-emitting element.

[0263] [A04] The display device according to [A03], wherein the areas of the light-emitting regions are different among the first light-emitting element, the second light-emitting element, and the third light-emitting element.

[0264] [A05] A display device according to [A01] or [A02], wherein the area of ​​the orthogonal projection image of the top surface area of ​​the color filter layer surrounded by the top surface of the color filter layer and the boundary line between the top surface of the color filter layer is different between the first light-emitting element, the second light-emitting element, and the third light-emitting element.

[0265] [A06] The display device according to [A05], wherein the area of ​​the light-emitting region is the same in the first light-emitting element, the second light-emitting element, and the third light-emitting element.

[0266] [A07] The display device according to any one of [A01] to [A06], wherein the first light-emitting area, the second light-emitting area, and the third light-emitting area emit white light.

[0267] [A08] The display device according to any one of [A01] to [A06], wherein the first light-emitting region emits red light, the second light-emitting region emits green light, and the third light-emitting region emits blue light.

[0268] [A09] The display device according to any one of [A01] to [A08], wherein

[0269] The first light emitting elements constituting the plurality of light emitting element groups are arranged along a first direction,

[0270] The second light emitting elements constituting the plurality of light emitting element groups are arranged along the first direction, and

[0271] The third light emitting elements constituting the plurality of light emitting element groups are arranged along the first direction.

[0272] [A10] The display device according to any one of [A01] to [A08], wherein

[0273] The light emitting element group consists of 4 light emitting elements arranged in 2×2.

[0274] The first light emitting element is arranged adjacent to the two third light emitting elements,

[0275] The second light emitting element is arranged adjacent to two third light emitting elements, and

[0276] Each of the two third light emitting elements is arranged adjacent to the first light emitting element and the second light emitting element.

[0277] [A11] The display device according to any one of [A01] to [A08], wherein

[0278] The light emitting element group is composed of a first light emitting element, a second light emitting element and a third light emitting element.

[0279] The first light emitting element is arranged adjacent to the second light emitting element and the third light emitting element, and

[0280] The second light emitting element is arranged adjacent to the first light emitting element and the third light emitting element.

[0281] Reference Symbol List

[0282] 10, 10R, 10G, 10B light emitting elements

[0283] 11, 11R, 11G, 11B luminous areas

[0284] 11R R 、11R L , 11G R , 11G L , 11B R , 11B L End of the light-emitting area

[0285] 20 transistors

[0286] 21 Gate electrode

[0287] 22 Gate insulation layer

[0288] 23 Channel formation region

[0289] 24 Source / Drain Region

[0290] 25 Component isolation area

[0291] 26 matrix

[0292] 28 Insulation layer

[0293] 27 Contact plug

[0294] 29 Opening

[0295] 31 first electrode

[0296] 32 second electrode

[0297] 33 organic layer

[0298] 34 protective film

[0299] 35 resin layer (sealing resin layer)

[0300] 37 Light reflection layer

[0301] 38 interlayer insulation layer

[0302] 39 basement membrane

[0303] 41 first substrate

[0304] 42 second substrate

[0305] 51R, 51G, 51B color filter layers

[0306] 521, 522, 523, 531, 532 are the boundary lines of the color filter layer.

Claims

1. A display device, formed by arranging a plurality of light emitting element groups on a substrate, each of the light emitting element groups comprising: A first light emitting element, comprising a first light emitting region and a first color filter layer arranged above the first light emitting region; a second light emitting element, adjacent to the first light emitting element and comprising a second light emitting region and a second color filter layer disposed above the second light emitting region; as well as A third light emitting element is adjacent to the second light emitting element and includes a third light emitting region and a third color filter layer arranged above the third light emitting region, wherein In adjacent light-emitting elements, the angle formed by the shortest line segments respectively formed from the same end boundary line of the bottom surface of the color filter layer to the ends of two adjacent light-emitting regions and the normal line of the substrate is the same in each of the light-emitting elements; Wherein, the cross section is formed by cutting the light emitting element group in a direction perpendicular to the substrate, the cross section of the first color filter layer has a side surface in an inverted cone shape, the cross section of the second color filter layer has a side surface in a forward cone shape, and, when the third color filter layer is not in contact with the first color filter layer of another light emitting element group, the cross section of the third color filter layer has a side surface in an inverted cone shape; when the third color filter layer is in contact with the first color filter layer of another light emitting element group, one side surface of the cross section of the third color filter layer has an inverted cone shape, and the other side surface has a forward cone shape.

2. The display device according to claim 1, wherein: The area of ​​the orthogonal projection image of the top surface region of the color filter layer surrounded by the top surface of the color filter layer and the boundary line between the top surfaces of the color filter layer on the substrate is the same in the first light-emitting element, the second light-emitting element, and the third light-emitting element.

3. The display device according to claim 2, wherein: The area of ​​the light emitting region is different among the first light emitting element, the second light emitting element, and the third light emitting element.

4. The display device according to claim 1, wherein: An area of ​​an orthogonal projection image of a top surface region of the color filter layer surrounded by a top surface of the color filter layer and a boundary line between top surfaces of the color filter layer on the substrate is different among the first light-emitting element, the second light-emitting element, and the third light-emitting element.

5. The display device according to claim 4, wherein: The area of ​​the light emitting region is the same in the first light emitting element, the second light emitting element, and the third light emitting element.

6. The display device according to claim 1, wherein: The first light emitting area, the second light emitting area, and the third light emitting area emit white light.

7. The display device according to claim 1, wherein: The first light emitting area emits red light, the second light emitting area emits green light, and the third light emitting area emits blue light.

8. The display device according to claim 1, wherein The first light emitting elements constituting the plurality of light emitting element groups are arranged along a first direction, The second light emitting elements constituting the plurality of light emitting element groups are arranged along the first direction, and The third light emitting elements constituting the plurality of light emitting element groups are arranged along the first direction.

9. The display device according to claim 1, wherein The light emitting element group is composed of 4 light emitting elements arranged in 2×2. The first light emitting element is arranged adjacent to the two third light emitting elements, The second light emitting element is arranged adjacent to the two third light emitting elements, and Each of the two third light emitting elements is arranged adjacent to the first light emitting element and the second light emitting element.

10. The display device according to claim 1, wherein The light emitting element group is composed of one first light emitting element, one second light emitting element and one third light emitting element. The first light emitting element is arranged adjacent to the second light emitting element and the third light emitting element, and The second light emitting element is arranged adjacent to the first light emitting element and the third light emitting element.

11. A display device, formed by arranging a plurality of light emitting element groups on a substrate, each of the light emitting element groups comprising: A first light emitting element, comprising a first light emitting region and a first color filter layer arranged above the first light emitting region; a second light emitting element, adjacent to the first light emitting element and comprising a second light emitting region and a second color filter layer disposed above the second light emitting region; as well as A third light emitting element is adjacent to the second light emitting element and includes a third light emitting region and a third color filter layer arranged above the third light emitting region, wherein When viewed from the normal direction of the substrate, the center of the top surface area of ​​the color filter layer surrounded by the top surface of the color filter layer and the boundary line between the top surfaces of the color filter layer and the center of the light emitting area do not overlap with each other, In adjacent light-emitting elements, the distances from the same end boundary line of the orthogonal projection image of the bottom surface of the color filter layer on the substrate to the closest ends of two adjacent light-emitting regions are the same in each of the light-emitting elements.

12. The display device according to claim 11, wherein: The area of ​​the orthogonal projection image of the top surface region of the color filter layer surrounded by the top surface of the color filter layer and the boundary line between the top surfaces of the color filter layer on the substrate is the same in the first light-emitting element, the second light-emitting element, and the third light-emitting element.

13. The display device according to claim 12, wherein: The area of ​​the light emitting region is different among the first light emitting element, the second light emitting element, and the third light emitting element.

14. The display device according to claim 11, wherein: An area of ​​an orthogonal projection image of a top surface region of the color filter layer surrounded by a top surface of the color filter layer and a boundary line between top surfaces of the color filter layer on the substrate is different among the first light-emitting element, the second light-emitting element, and the third light-emitting element.

15. The display device according to claim 14, wherein: The area of ​​the light emitting region is the same in the first light emitting element, the second light emitting element, and the third light emitting element.

16. The display device according to claim 11, wherein: The first light emitting area, the second light emitting area, and the third light emitting area emit white light.

17. The display device according to claim 11, wherein: The first light emitting area emits red light, the second light emitting area emits green light, and the third light emitting area emits blue light.

18. The display device according to claim 11, wherein The first light emitting elements constituting the plurality of light emitting element groups are arranged along a first direction, The second light emitting elements constituting the plurality of light emitting element groups are arranged along the first direction, and The third light emitting elements constituting the plurality of light emitting element groups are arranged along the first direction.

19. The display device according to claim 11, wherein The light emitting element group is composed of 4 light emitting elements arranged in 2×2. The first light emitting element is arranged adjacent to the two third light emitting elements, The second light emitting element is arranged adjacent to the two third light emitting elements, and Each of the two third light emitting elements is arranged adjacent to the first light emitting element and the second light emitting element.

20. The display device according to claim 11, wherein The light emitting element group is composed of one first light emitting element, one second light emitting element and one third light emitting element. The first light emitting element is arranged adjacent to the second light emitting element and the third light emitting element, and The second light emitting element is arranged adjacent to the first light emitting element and the third light emitting element.

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