Display device

Abstract

A display device (30) includes: a light emitting element (20) provided on a substrate (1) and including a first electrode (2) that reflects visible light, a second electrode (7) that transmits visible light, and a light emitting layer (5) provided between the first electrode (2) and the second electrode (7); a sub-pixel (RSP) that is a light emitting region of the light emitting element (20) in plan view; a polarizing plate (9) that is disposed so as to overlap with a part of the sub-pixel (RSP) in plan view, above the light emitting element (20) in a light emission direction (LD) that is a direction in which light is emitted from the light emitting element (20); and a light shielding layer (10) that is disposed higher than the polarizing plate (9) in the light emission direction (LD) at least in part of a periphery of the sub-pixel (RSP).

Description

Technical Field

[0001] This disclosure relates to display devices including light-emitting elements. Background Technology

[0002] In recent years, display devices that utilize QLED (Quantum dot Light Emitting Diode) or OLED (Organic Light Emitting Diode) as light-emitting elements have attracted much attention.

[0003] However, in these display devices, in order to extract light from the light-emitting element, the light-emitting element is usually configured to have a reflective electrode. This results in problems such as difficulty in visually recognizing images due to external light reflection caused by the reflective electrode, and difficulty in displaying complete black when the light-emitting element is not emitting light.

[0004] Patent document 1 describes a method for reducing external light reflection generated by a reflective electrode in a display device equipped with an OLED by using a light-shielding component and a polarizing plate. Existing technical documents Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2010-085645 Summary of the Invention The technical problem to be solved by the present invention

[0006] However, in the display device described in Patent Document 1, since the polarizing plate disposed on the observer's side covers the entire surface of the display area, all the light emitted from the light-emitting element passes through the polarizing plate. Since the light from the light-emitting element is randomly polarized, about half of the light from the light-emitting element is absorbed by the polarizing plate, thus resulting in a reduction in the intensity of the light that can be extracted from the light-emitting element.

[0007] One aspect of this disclosure is made in view of the aforementioned problems, and its object is to provide a display device that makes external light reflection caused by a reflective electrode visually unrecognizable, while improving the extraction of light from the light-emitting element. Solution to the problem

[0008] To solve the aforementioned problems, the display device disclosed herein includes: a light-emitting element disposed on a substrate and comprising: a first electrode that reflects visible light, a second electrode that transmits visible light, and a light-emitting layer disposed between the first electrode and the second electrode; a sub-pixel, which is a light-emitting area of ​​the light-emitting element when viewed from above; a polarizing plate disposed on the light-emitting element in a light emission direction that is the direction in which light is emitted from the light-emitting element, and which, when viewed from above, overlaps a portion of the sub-pixel; and a light-shielding layer disposed at least a portion around the sub-pixel, which, in the light emission direction, is disposed higher than the polarizing plate. Invention Effects

[0009] According to one aspect of this disclosure, a display device that improves the extraction of light from a light-emitting element is provided, which makes external light reflection caused by a reflective electrode (first electrode) unrecognizable to the eye, while improving the extraction of light from the light-emitting element. Attached Figure Description

[0010] Figure 1 This is a top view showing the schematic configuration of the display device according to Embodiment 1. Figure 2 This is a top view showing the display area of ​​the display device according to Embodiment 1. Figure 3 (a) is Figure 2 The cross-sectional view of the display device along line A-A' shown. Figure 3 (b) is a diagram showing a modified example of the display device according to Embodiment 1. Figure 4 of (a), Figure 4 (b) Figure 4 (c) Figure 4 (d) Figure 4 (e) and Figure 4 (f) is a diagram used to explain why, in the display device of Embodiment 1 and a modified example of the display device of Embodiment 1, external light reflection can be made visually unrecognizable and the extraction of light from the light-emitting element is improved. Figure 5 This is a diagram used to illustrate the relationship between the height of the light-shielding layer and the area where the polarizing plate is disposed in the display device of Embodiment 1. Figure 6 This is a diagram used to illustrate the relationship between the height of the light-shielding layer and the size of the sub-pixels in the display device of Embodiment 1. Figure 7 of (a), Figure 7 (b) Figure 7 (c) and Figure 7(d) is a graph illustrating the angular dependence of the luminous intensity of light emitted from the light-emitting element of the display device of Embodiment 1. Figure 8 This is a graph showing the luminous intensity of light emitted from the light-emitting element of the display device of Embodiment 1 at each angle of radiation. Figure 9 of (a), Figure 9 (b) and Figure 9 (c) is a diagram showing an example of the manufacturing process of the polarizing plate included in the display device of Embodiment 1. Figure 10 This diagram shows the state in which a polarizing plate for inspection is mounted on the display device of Embodiment 1. Figure 11 This is a top view showing the display area of ​​the display device according to Embodiment 2. Figure 12 yes Figure 11 The cross-sectional view of line B-B' shown. Figure 13 (a) is a diagram illustrating the relationship between the height of the light-shielding layer and the area where the polarizing plate is disposed in the display device of Embodiment 2. Figure 13 (b) is a diagram illustrating the relationship between the height of the light-shielding layer and the size of the sub-pixels in the display device of Embodiment 2. Figure 14 This is a top view showing the display area of ​​the display device according to Embodiment 3. Figure 15 This is a top view showing the display area of ​​the display device according to Embodiment 4. Figure 16 (a) is a cross-sectional view of the display area of ​​the display device according to embodiment 5. Figure 16 (b) is a cross-sectional view of the display area of ​​a modified example of the display device of Embodiment 5. Figure 17 This is a top view showing the display area of ​​the display device according to Embodiment 6. Figure 18 (a) is a cross-sectional view of the display area of ​​the display device according to embodiment 7. Figure 18 (b) is a cross-sectional view of the display area of ​​a modified example of the display device of Embodiment 7. Detailed Implementation

[0011] based on Figures 1 to 18 Embodiments of the present invention will be described below. For ease of explanation, the same reference numerals will sometimes be used to refer to configurations having the same function as those described in specific embodiments, and their descriptions will be omitted.

[0012] [Implementation Method 1] Figure 1 This is a top view showing the schematic configuration of the display device 30 according to Embodiment 1.

[0013] like Figure 1 As shown, the display device 30 includes a border area NDA and a display area DA. The display area DA of the display device 30 includes a plurality of pixels (PIX), each pixel (PIX) comprising a red sub-pixel RSP, a green sub-pixel GSP, and a blue sub-pixel BSP. In this embodiment, the case where each pixel (PIX) is composed of a red sub-pixel RSP, a green sub-pixel GSP, and a blue sub-pixel BSP is used as an example for explanation, but it is not limited to this. For example, each pixel (PIX) may include sub-pixels of other colors besides the red sub-pixel RSP, green sub-pixel GSP, and blue sub-pixel BSP.

[0014] Figure 2 This is a top view showing the display area DA of the display device 30 according to Embodiment 1.

[0015] like Figure 2 As shown, the display area DA of the display device 30 includes multiple pixels, each pixel including a red sub-pixel RSP, a green sub-pixel GSP, and a blue sub-pixel BSP. The red sub-pixel RSP is the light-emitting area of ​​the light-emitting element (which emits red light) described later, as viewed from above; the green sub-pixel GSP is the light-emitting area of ​​the light-emitting element (which emits green light) described later, as viewed from above; and the blue sub-pixel BSP is the light-emitting area of ​​the light-emitting element (which emits blue light) described later, as viewed from above.

[0016] Figure 2 The display area DA of the display device 30 shown is the surface (display surface) of the display device 30, which is the light emission direction of the light emitted from the light-emitting element described later.

[0017] Figure 3 (a) is Figure 2 The cross-sectional view of the display device 30 along line A-A' shown.

[0018] like Figure 3 As shown in (a), the light-emitting element 20 is disposed on a substrate 1 containing a transistor, and includes a first electrode 2 that reflects visible light, a second electrode 7 that transmits visible light, and a light-emitting layer 5 disposed between the first electrode 2 and the second electrode 7. Furthermore, the drain electrode of the transistor (not shown) included in the substrate 1 is electrically connected to the first electrode 2 that reflects visible light.

[0019] In this embodiment, a light-emitting element 20 is described as an example, with a first electrode 2 reflecting visible light as the anode, a second electrode 7 transmitting visible light as the cathode, and a light-emitting layer 5 containing quantum dots (QDs). The element has a hole transport layer 4 between the first electrode 2 and the light-emitting layer 5, and an electron transport layer 6 between the light-emitting layer 5 and the second electrode 7. However, this is not a limitation. For example, a hole injection layer (not shown) may be provided between the first electrode 2 and the hole transport layer 4, and an electron injection layer (not shown) may be provided between the electron transport layer 6 and the second electrode 7. Furthermore, at least one of the hole transport layer 4 and the hole injection layer (not shown) may be omitted between the first electrode 2 and the light-emitting layer 5, and at least one of the electron transport layer 6 and the electron injection layer (not shown) may be omitted between the light-emitting layer 5 and the second electrode 7.

[0020] In this embodiment, the case where the display device 30 has a top-emitting light-emitting element 20 is described as an example, but it is not limited to this. The display device may also have a bottom-emitting light-emitting element, which will be described later in embodiment 7.

[0021] like Figure 3 As shown in (a), when the light-emitting element 20 has a stacked film with a sequentially stacked structure, that is, when the anode, hole transport layer 4, light-emitting layer 5, electron transport layer 6, and cathode are stacked sequentially from the substrate 1 side, since the cathode is positioned above the anode, in order to form a top-emitting type, it is only necessary to set the first electrode 2 that reflects visible light as the anode and the second electrode 7 that transmits visible light as the cathode. On the other hand, although not shown, when the light-emitting element 20 has a stacked film with a reverse structure, that is, when the cathode, electron transport layer 6, light-emitting layer 5, hole transport layer 4, and anode are stacked sequentially from the substrate 1 side, since the anode is positioned above the cathode, in order to form a top-emitting type, it is only necessary to set the first electrode 2 that reflects visible light as the cathode and the second electrode 7 that transmits visible light as the anode. As described above, since the light-emitting element 20 is a top-emitting type, the direction of light emitted from the light-emitting element 20, i.e., the light emission direction LD, is as follows: Figure 3 As shown in (a), it is in the upward direction.

[0022] In this embodiment, the display device 30 is described as having a retaining wall 3 as an example, but it is not limited to this; the display device 30 may also not have a retaining wall 3. Figure 3 As shown in (a), the dam 3 is formed to cover the end of the first electrode 2, and a hole transport layer 4 and a light-emitting layer 5 are disposed on the first electrode 2 and in the area surrounded by the dam 3.

[0023] The light-emitting area of ​​the light-emitting element 20 when viewed from above is determined by the area where the first electrode 2, the light-emitting layer 5, and the second electrode 7 overlap when viewed from above. In the case of the light-emitting element 20, since the size of the light-emitting layer 5 is smaller than the size of the first electrode 2 or the second electrode 7, the light-emitting area of ​​the light-emitting element 20 when viewed from above is determined based on the size of the light-emitting layer 5.

[0024] The substrate 1 includes a support substrate, a transistor (not shown) for driving the light-emitting element 20, wiring electrically connected to the electrodes of the transistor, and various insulating films. The support substrate may be, for example, a resin substrate formed of polyimide, or a glass substrate.

[0025] The first electrode 2, which reflects visible light, can be formed from an electrode material that reflects visible light. As an electrode material that reflects visible light, it is not particularly limited as long as it can reflect visible light and has electrical conductivity. Examples include: metallic materials such as Al, Mg, Li, and Ag, alloys of such metallic materials, or laminates of such metallic materials with transparent metal oxides (e.g., indium tin oxide, indium zinc oxide, indium gallium zinc oxide, etc.), or laminates of such alloys with such transparent metal oxides, etc.

[0026] On the other hand, the second electrode 7, which transmits visible light, can be formed from an electrode material that transmits visible light. As an electrode material that transmits visible light, it is not particularly limited as long as it can transmit visible light and is conductive; examples include transparent metal oxides (e.g., indium tin oxide, indium zinc oxide, indium gallium zinc oxide, etc.) or thin films made of metal materials such as Al, Mg, Li, and Ag.

[0027] For example, embankment 3 can be formed by patterning it using photolithography after coating it with organic materials such as photosensitive polyimide or photosensitive acrylic.

[0028] The material used for the hole transport layer 4 is not particularly limited as long as it is a hole transport material capable of stabilizing the transport of holes into the light-emitting layer 5. Preferably, the hole transport material is a material with high hole mobility. Furthermore, the hole transport material is preferably a material capable of preventing electrons moving from the cathode from penetrating (an electron-blocking material).

[0029] As for the material used in the hole injection layer (not shown), there are no particular limitations as long as it is a hole injection material that can stabilize the injection of holes into the light-emitting layer 5.

[0030] In this embodiment, the case where the light-emitting layer 5 has quantum dots (QD), that is, the case where the light-emitting layer 5 is a light-emitting layer for QLED, is used as an example for explanation, but it is not limited to this. For example, the light-emitting layer 5 can also be a light-emitting layer for OLED formed by vapor deposition.

[0031] In this embodiment, the case where the display device 30 only has QLED as a light-emitting element is described as an example, but it is not limited to this. The display device 30 can have at least one of QLED and OLED as a light-emitting element.

[0032] Figure 2 The red sub-pixel RSP shown is the light-emitting area of ​​a light-emitting element with a red light-emitting layer, viewed from above. Figure 2 The green sub-pixel GSP shown is the light-emitting area of ​​a light-emitting element with a green light-emitting layer when viewed from above. Figure 2 The blue sub-pixel BSP shown is the light-emitting area of ​​a light-emitting element with a blue light-emitting layer when viewed from above.

[0033] The quantum dot (QD) emitting layer 5 can be, for example, a red emitting layer, a green emitting layer, or a blue emitting layer, as described below. To enable the light-emitting element 20 equipped with the quantum dot (QD) emitting layer 5 to emit different colors, nuclei of the same material but different particle sizes can be used. For example, the red emitting layer uses the largest particle size nuclei, the blue emitting layer uses the smallest particle size nuclei, and the green emitting layer can use nuclei with a particle size between that of the nuclei used in the red emitting layer and that used in the blue emitting layer. Furthermore, to enable the light-emitting element 20 equipped with the quantum dot (QD) emitting layer 5 to emit different colors, nuclei of different materials can also be used.

[0034] The material used for the electron transport layer 6 is not particularly limited, as long as it is an electron transport material capable of transporting electrons injected from the cathode to the light-emitting layer 5. Preferably, the electron transport material is a material with high electron mobility. Furthermore, the electron transport material is preferably a material capable of preventing holes moving from the anode from penetrating (a hole-blocking material). This improves the recombination efficiency of holes and electrons within the light-emitting layer 5.

[0035] The material used for the electron injection layer (not shown) is not particularly limited as long as it is an electron injection material that can stabilize the injection of electrons into the light-emitting layer 5.

[0036] In this embodiment, such as Figure 3As shown in (a), the example described is that the display device 30 has a quarter-wave plate 8 in the entire display area DA between the light-emitting element 20 and the polarizing plate 9, but it is not limited to this. For example, it is preferable that the quarter-wave plate 8 is arranged between the light-emitting element 20 and the polarizing plate 9 in such a way that it at least overlaps with the polarizing plate 9 when viewed from above. In addition, the quarter-wave plate 8 may be omitted appropriately.

[0037] By setting a quarter-wave plate 8, external light, after passing through the polarizing plate 9 and becoming polarized, passes through the quarter-wave plate 8 again. After being reflected by the first electrode 2 that reflects visible light, the polarized light that passes through the quarter-wave plate 8 again cannot pass through the polarizing plate 9. Therefore, it is possible to further prevent the external light reflection caused by the first electrode 2 that reflects visible light from being visually recognized.

[0038] Furthermore, even if it is just the polarizing plate 9, the amount of randomly polarized light, i.e., external light, incident on the first electrode 2 in the light-emitting element 20 for reflecting visible light can be suppressed by the polarizing plate 9. Therefore, the external light reflection caused by the first electrode 2 for reflecting visible light can be made not visually recognizable.

[0039] The 1 / 4 wavelength plate 8 can be formed by pasting or coating, and there is no particular limitation on the formation method.

[0040] like Figure 2 and Figure 3 As shown in (a), in the display device 30, a polarizing plate 9 is provided on the light-emitting element 20 in the light emission direction LD, which is the direction in which light is emitted from the light-emitting element 20, so as to overlap with a portion of each of the red sub-pixel RSP, the green sub-pixel GSP, and the blue sub-pixel BSP when viewed from above. Moreover, at least a portion of the light-shielding layer 10 around each of the red sub-pixel RSP, the green sub-pixel GSP, and the blue sub-pixel BSP is provided higher than the polarizing plate 9 in the light emission direction LD.

[0041] Based on the above configuration, the polarizing plate 9 is arranged such that it overlaps with a portion of each of the red sub-pixel RSP, green sub-pixel GSP, and blue sub-pixel BSP when viewed from above. Therefore, when viewed from above, the polarizing plate 9 does not overlap with the remaining portions of each of the red sub-pixel RSP, green sub-pixel GSP, and blue sub-pixel BSP. This improves the extraction of light from the remaining portions of each of the red sub-pixel RSP, green sub-pixel GSP, and blue sub-pixel BSP. Furthermore, the light-shielding layer 10 reduces the incidence of external light, thereby reducing external light reflection caused by the first electrode 2. Additionally, since the light-shielding layer 10 blocks external light reflected by the first electrode 2, the external light reflected by the first electrode 2 can be visually recognized. Furthermore, the polarizing plate 9 reduces external light reflection caused by the first electrode 2 and makes the external light reflected by the first electrode 2 visually recognizable.

[0042] Thus, a display device 30 is made possible so that external light reflection from the first electrode 2 is not visually recognizable and light extraction from the light-emitting element 20 is improved.

[0043] In this embodiment, such as Figure 2 as well as Figure 3 As shown in (a), the light-shielding layer 10 is illustrated as an example comprising a first light-shielding wall and a second light-shielding wall that are straight lines formed along the two opposing sides of each of the red sub-pixel RSP, the green sub-pixel GSP, and the blue sub-pixel BSP, i.e., the left and right sides, but is not limited to this. Furthermore, the two opposing sides of each of the red sub-pixel RSP, the green sub-pixel GSP, and the blue sub-pixel BSP could also be the top and bottom sides.

[0044] Based on the above configuration, since the light-shielding layer 10 includes a portion formed in a straight line, methods other than patterning the polarizer 9 can be used, such as attaching a polarizer in a straight line.

[0045] In this embodiment, such as Figure 2 and Figure 3 As shown in (a), the polarizing plate 9 has a portion that is separated from the light-shielding layer 10 and is formed into a straight line at the middle position between the first light-shielding wall and the second light-shielding wall of the light-shielding layer 10.

[0046] In a light-emitting element manufactured by coating a light-emitting material in which quantum dots (QDs) are dispersed in a solvent, as in the light-emitting element 20 of this embodiment, when the peripheral portion of the light-emitting layer 5 is formed to be thicker than the central portion due to the surface tension of the solvent, the luminous brightness of the peripheral portions of each of the red sub-pixel RSP, green sub-pixel GSP, and blue sub-pixel BSP is more likely to be higher than the luminous brightness of the central portions of each of the red sub-pixel RSP, green sub-pixel GSP, and blue sub-pixel BSP. Based on this configuration, since the polarizing plate 9 is arranged to overlap with the central portions of each of the red sub-pixel RSP, green sub-pixel GSP, and blue sub-pixel BSP when viewed from above, in the case of a display device where the luminous brightness of the central portions of each of the red sub-pixel RSP, green sub-pixel GSP, and blue sub-pixel BSP is lower than the luminous brightness of the peripheral portions of each of the red sub-pixel RSP, green sub-pixel GSP, and blue sub-pixel BSP, the extraction of light from the light-emitting element 20 can be improved.

[0047] The polarizing plate 9 can be formed, for example, by pasting, or by patterning through coating, exposure and development, as described later. There are no particular limitations on the method of formation.

[0048] The light-shielding layer 10 can be formed of any light-shielding material. In this embodiment, the case where the light-shielding layer 10 contains a material that absorbs visible light is used as an example, but it is not limited to this. Examples of materials that absorb visible light include carbon black, but it is not limited to this. In this embodiment, for example, a negative-type photosensitive resin containing carbon black to a degree that ensures light-shielding properties is used for coating, exposure, and development to form a light-shielding layer 10 with a predetermined shape and height.

[0049] When the light-shielding layer 10 contains a material that absorbs visible light, the external light reflection caused by the first electrode 2 can be further reduced by the light-shielding layer 10, and the external light reflected by the first electrode 2 can be further made not visually recognizable.

[0050] In this embodiment, such as Figure 3 As shown in (a), the case in which a transparent plate 13 is provided on the light-emitting element 20 in such a way as to surround the polarizing plate 9, and a light-shielding layer 10 is provided on the transparent plate 13 is described as an example, but it is not limited to this.

[0051] According to the above configuration, since the upper part of the light-emitting element 20, except for the polarizing plate 9, is covered by the transparent plate 13, the reliability of the display device 30 can be improved.

[0052] Figure 3 (b) is a diagram showing a modified example of the display device 30 according to Embodiment 1.

[0053] like Figure 3As shown in (b), the light-shielding layer 10 can also be disposed on the 1 / 4 wavelength plate 8 of the entire display area DA between the light-emitting element 20 and the polarizing plate 9.

[0054] In this embodiment, such as Figure 3 (a) and Figure 3 As shown in (b), the light-shielding layer 10 is configured to overlap at least a portion of the embankment 3 when viewed from above, but is not limited thereto.

[0055] According to the above configuration, the light-shielding layer 10 does not overlap with the red sub-pixel RSP, the green sub-pixel GSP, and the blue sub-pixel BSP when viewed from above, thus improving the extraction of light from the light-emitting element 20.

[0056] In this embodiment, such as Figure 3 (a) and Figure 3 As shown in (b), a sealing layer 12 is provided such that it covers the polarizing plate 9 and, when viewed from above, overlaps at least entirely with the red sub-pixel RSP, the green sub-pixel GSP, and the blue sub-pixel BSP. The sealing layer 12 can be formed, for example, from nitrogen, air, etc., to make the refractive index n 1. Furthermore, the configuration of a sealing layer having a refractive index n greater than 1 will be described using Embodiment 2, which will be described later.

[0057] Furthermore, in cases where the gas constituting the sealing layer 12 can be sealed through the light-shielding layer 10 and the sealing glass 11, for example, the sealing layer 12 can be formed using nitrogen by performing a process of attaching the sealing glass 11 to the light-shielding layer 10 under a nitrogen atmosphere. On the other hand, in cases where the gas constituting the sealing layer 12 cannot be sealed through the light-shielding layer 10 and the sealing glass 11, the sealing layer 12 is formed using air. According to the above configuration, a sealing layer 12 with a refractive index n of 1 can be provided in the light emission direction LD, which is the direction of light emitted from the light-emitting element 20.

[0058] Figure 4 of (a), Figure 4 (b) Figure 4 (c) Figure 4 (d) Figure 4 (e) and Figure 4 Figure (f) is used to explain why, in the display device 30 and its variations, external light reflection can be made visually imperceptible and the extraction of light from the light-emitting element 20 is improved. Furthermore, in Figure 4 (a)~ Figure 4 In (f), θ1 is, for example, 40°, and θ2 is, for example, 70°.

[0059] In addition, Figure 4 (a)~ Figure 4In (f), with any point of the light-emitting area of ​​the light-emitting element 20 in the top view, i.e., the sub-pixel RSP·GSP·BSP, as the origin, any angle in the plane relative to the first axis in the plane passing through the origin is set as φ, and any angle relative to the second axis R is set as θ. The second axis R passes through the origin and is orthogonal to the first axis in the vertical direction from the sub-pixel RSP·GSP·BSP.

[0060] like Figure 4 As shown in (a), when a user observes the display area DA of the display device 30 at an angle θ relative to the second axis R within the range of 0°≤θ<θ1 (when viewed from the front), there is also light L2 passing through the polarizing plate 9 in the emitted light of the light-emitting element 20. However, since there is light L1 passing through the part where the polarizing plate 9 is not provided, the light extraction from the light-emitting element 20 can be improved.

[0061] like Figure 4 As shown in (b), when a user observes the display area DA of the display device 30 at an angle θ relative to the second axis R within the range of θ1 ≤ θ < θ2 (when observing at a slight tilt), light extraction from the light-emitting element 20 is improved for light with a smaller angle θ in the emitted light L3 from the light-emitting element 20. On the other hand, for light with a larger angle θ in the emitted light L3 from the light-emitting element 20, there is light that is blocked by the light-shielding layer 10, therefore, light extraction from the light-emitting element 20 is reduced.

[0062] like Figure 4 As shown in (c), when the user observes the display area DA of the display device 30 at an angle θ relative to the second axis R within the range of θ2≤θ (observation at an angle), the emitted light L4 from the light-emitting element 20 is blocked by the light-shielding layer 10, so the user cannot visually recognize the image of the display area DA.

[0063] As described above, in the case of the display device 30, it is particularly possible to improve the extraction of light from the light-emitting element 20 in the front direction.

[0064] like Figure 4 As shown in (d), when a user observes the display area DA of the display device 30 at an angle θ relative to the second axis R within the range of 0° ≤ θ < θ1 (when viewed from the front), the reflection of external light caused by the first electrode 2, which reflects visible light, is visually recognized because of the presence of light L5 passing through the portion where the polarizing plate 9 is not provided. However, in such a position where the user is in front, it is difficult to consider the user as the source of external light, so this need not be taken into account.

[0065] like Figure 4As shown in (e), when a user observes the display area DA of the display device 30 at an angle θ relative to the second axis R within the range of θ1 ≤ θ < θ2 (when observing at a slight tilt), since external light L6 is incident on the portion where the polarizer 9 is provided, the reflected light of external light L6 caused by the first electrode 2 that reflects visible light can be reduced by the polarizer 9. External light L6' is incident on the portion where the polarizer 9 is not provided and is reflected by the first electrode 2 that reflects visible light, so it can be reduced by the light-shielding layer 10. External light L6” is incident on the light-shielding layer 10, so it can be reduced by the light-shielding layer 10.

[0066] like Figure 4 As shown in (f), when the user observes the display area DA of the display device 30 within the range of θ2≤θ (when viewed at an angle), the external light L7 is blocked by the light-shielding layer 10, thus reducing the reflection of external light caused by the first electrode 2 that reflects visible light.

[0067] As described above, in the case of the display device 30, since the reflection of external light caused by the first electrode 2 that reflects visible light can be reduced, the reflection of external light caused by the first electrode 2 that reflects visible light can be made visually unrecognizable.

[0068] Preferably, in the display device 30 of this embodiment, the area where the polarizing plate 9 is disposed is determined in the following manner.

[0069] Preferably, when any point of the light-emitting area of ​​the light-emitting element 20, i.e., the sub-pixel RSP·GSP·BSP, is taken as the origin, any angle in the plane relative to the first axis passing through the origin is set as φ, and any angle relative to the second axis R is set as θ. The second axis R passes through the origin and is orthogonal to the first axis in the vertical direction from the sub-pixel RSP·GSP·BSP. When light that varies in the range of 0° to 360° and θ that varies in the range of 0° to 60° is irradiated toward the sub-pixel RSP·GSP·BSP, a shadow area is generated in the sub-pixel RSP·GSP·BSP through the light-shielding layer 10, and the polarizing plate 9 is disposed in the area outside the shadow area.

[0070] As described above, if the area where the polarizing plate 9 is set is determined, the polarizing plate 9 can be set only in the area where the effect is produced, thus enabling the display device 30 to further improve the extraction of light in the front direction.

[0071] Figure 5 This is a diagram used to illustrate the relationship between the height H of the light-shielding layer 10 and the area where the polarizing plate 9 is disposed in the display device 30 of Embodiment 1.

[0072] Preferably, when the height of the light-shielding layer 10 is set to H, and the length of the longest straight line drawn perpendicular to the light-shielding layer 10 and the polarizing plate 9 on the surface where the light-shielding layer 10 is formed is set to W, the height H of the light-shielding layer 10 and the length W of the longest straight line are determined in such a way that θ1, defined by tanθ1=W / H and 0°<θ1<90°, satisfies θ1≤45°.

[0073] When the height H of the light-shielding layer 10 and the length W of the longest straight line are determined in a way that satisfies θ1≤45°, when the user observes the display area DA of the display device 30 at an angle θ relative to the second axis R within the range of 0°≤θ<θ1 (θ1≤45°) (when viewed from the front), since the user is in a position at the front, it is difficult to assume that external light will enter, and the reflection of external light to the vicinity of the front can be reduced.

[0074] Figure 6 This is a diagram used to illustrate the relationship between the height H of the light-shielding layer 10 and the size of the sub-pixels RSP, GSP, and BSP in the display device 30 of Embodiment 1.

[0075] Preferably, when the height of the light-shielding layer 10 is set to H, and the width of the sub-pixels RSP, GSP, and BSP in the direction perpendicular to the light-shielding layer 10 on the surface where the light-shielding layer 10 is formed is set to L, the height H of the light-shielding layer 10 and the width L of the sub-pixels RSP, GSP, and BSP are determined in such a way that θ2, defined by tanθ2 = L / H and 0° < θ2 < 90°, satisfies θ2 ≥ 60°.

[0076] When the height H of the light-shielding layer 10 and the width L of the sub-pixels RSP·GSP·BSP are configured such that θ2≥60° are satisfied, the emitted light from the light-emitting element 20 can be visually recognized within an angle θ of at least 0° to 60° relative to the second axis R.

[0077] In this embodiment, for example, the height H of the light-shielding layer 10 is set to 36 μm, the width L of the sub-pixel RSP·GSP·BSP is set to 100 μm, and the length W of the longest straight line is set to 31 μm, so that θ1 is 40° and θ2 is 70°.

[0078] Figure 7 of (a), Figure 7 (b) Figure 7 (c) and Figure 7 (d) is a graph illustrating the angular dependence of the luminous intensity of light emitted from the light-emitting element 20 of the display device 30 of Embodiment 1.

[0079] like Figure 7As shown in (a), when a user observes the display area DA of the display device 30 at an angle θ relative to the second axis R within the range of 0° ≤ θ < θ1 (when viewed from the front), i.e., 0 ≤ tanθ ≤ W / H, the luminous intensity of the light-emitting element 20 is proportional to W + r(L - 2W) + (W - Htanθ). Here, r is the brightness of a certain area of ​​the polarizing plate 9. When the brightness of the area without the polarizing plate 9 is set to 1, r is approximately 0.4.

[0080] like Figure 7 As shown in (b), when the user observes the display area DA of the display device 30 at an angle θ relative to the second axis R within the range of θ1≤θ<θ2 (when observing at a slight tilt) and the angle θ is relatively small, i.e. W / H<tanθ≤(LW) / H, the luminous intensity of the light-emitting element 20 is proportional to W+r(LW-Htanθ).

[0081] like Figure 7 As shown in (c), when the user observes the display area DA of the display device 30 at an angle θ relative to the second axis R within the range of θ1≤θ<θ2 (when observing at a slight tilt) and the angle θ is relatively large, i.e. (LW) / H<tanθ≤L / H, the luminous intensity of the light-emitting element 20 is proportional to L-Htanθ.

[0082] like Figure 7 As shown in (d), when the user observes the display area DA of the display device 30 at an angle θ relative to the second axis R within the range of θ2≤θ≤90° (when viewed at an angle), that is, (LW) / H<tanθ≤L / H, the luminous intensity of the light-emitting element 20 is 0.

[0083] Figure 8 This is a graph showing the luminous intensity of light emitted from the light-emitting element 20 of the display device 30 in Embodiment 1 at each angle of radiation.

[0084] Figure 8 The conventional example shown is a configuration in which the entire display area of ​​the display device has a polarizing plate 9 but no light-shielding layer 10, which is the result of multiplying the total radiation angle by a Lambert by r (=0.4).

[0085] exist Figure 8 In the case of Embodiment 1 (Display Device 30 of Embodiment 1), the light extraction from the light-emitting element 20 increases in the range of 0° to 50° compared to the conventional example. Furthermore, in Embodiment 1, the light extraction from the light-emitting element 20 decreases in the range of 51° to 70° compared to the conventional example. Moreover, in Embodiment 1, no light is extracted from the light-emitting element 20 in the range of 71° to 90°.

[0086] As can be seen from the above, the display device 30 is a display device that particularly improves the extraction of light from the light-emitting element 20 in the front direction. Furthermore, according to the display device 30, when a user observes the display area DA of the display device 30 within an angle θ of 71° to 90° relative to the second axis R, visual recognition is impossible. Therefore, for example, in the case where the display device 30 is applied to a mobile display device, a display device that can protect the user's privacy can be realized.

[0087] Figure 9 of (a), Figure 9 (b) and Figure 9 (c) is a diagram showing an example of the manufacturing process of the polarizing plate 9 included in the display device 30 of Embodiment 1.

[0088] In this embodiment, the case of forming by pasting polarizing plate 9 is described as an example, but it is not limited to this, and polarizing plate 9 may also be formed as follows.

[0089] like Figure 9 As shown in (a), for example, after coating a polymeric liquid crystal compound containing a dichroic pigment onto a quarter-wave plate 8, the solvent is dried, and the polymeric liquid crystal compound 9a is oriented. Then, as... Figure 9 As shown in (b), when ultraviolet light (UV) is irradiated onto a predetermined position of the polymerizable liquid crystal compound 9a through the opening K of the photomask PM, the portion irradiated by the UV light polymerizes to become the polarizer 9, while the portion not irradiated by the UV light remains unpolymerized. Then, as... Figure 9 As shown in (c), the polarizing plate 9 can be formed in a specified position by cleaning with a solvent.

[0090] Figure 10 This diagram shows the state in which the polarizing plate 19 for inspection is placed on the display device 30 of Embodiment 1.

[0091] like Figure 10 As shown, for example during the inspection of the display device 30, an inspection polarizing plate 19 with a polarization direction orthogonal to the polarizing plate 9 is mounted on the polarizing plate 9. Furthermore, the inspection polarizing plate 19 is an inspection polarizing plate used only during shipment inspection, so it is preferable that it can be easily installed and removed from the display device 30.

[0092] By placing the inspection polarizing plate 19 on the polarizing plate 9, the light emission from the central portion of the sub-pixels RSP, GSP, and BSP can be blocked, and the light emission from only the outer portion of the sub-pixels RSP, GSP, and BSP can be inspected. Furthermore, the outer portion of the sub-pixels RSP, GSP, and BSP is, for example, a region prone to uneven coating and film thickness due to the influence of the dam 3.

[0093] [Implementation Method 2] Next, based on Figure 11 , Figure 12 as well as Figure 13 Embodiment 2 of the present invention will now be described. The display device 30a of this embodiment differs from the display device 30 described in Embodiment 1 in that it includes a sealing layer 14 made of resin or an inorganic film with a refractive index n greater than 1 and does not have a sealing glass 11. Otherwise, it is as described in Embodiment 1. For ease of explanation, components having the same function as those shown in the drawings of Embodiment 1 are labeled with the same reference numerals, and their descriptions are omitted.

[0094] Figure 11 This is a top view showing the display area DA of the display device 30a according to Embodiment 2.

[0095] Figure 12 yes Figure 11 The cross-sectional view of line B-B' shown.

[0096] like Figure 11 and Figure 12 As shown, a sealing layer 14 is provided in the display device 30a, which covers the polarizing plate 9 and, when viewed from above, overlaps at least entirely with the sub-pixels RSP, GSP, and BSP. Furthermore, the sealing layer 14 is composed of a resin or inorganic film with a refractive index n greater than 1. Examples of resins with a refractive index n greater than 1 include acrylic resin and epoxy resin, but it is not limited to these. Similarly, examples of inorganic films with a refractive index n greater than 1 include silicon oxide films and silicon nitride films, but it is not limited to these.

[0097] In the case of display device 30a, since it has a sealing layer 14 made of resin or inorganic film, the reliability of display device 30a can be improved.

[0098] Figure 13 Figure (a) is a diagram illustrating the relationship between the height H of the light-shielding layer 10a and the area where the polarizing plate 9 is disposed in the display device 30a of Embodiment 2. Figure 13 (b) is a diagram illustrating the relationship between the height H of the light-shielding layer 10a and the size of the sub-pixel RSP·GSP·BSP in the display device 30a of Embodiment 2.

[0099] Preferably, such as Figure 13 As shown in (a), when the refractive index of the sealing layer 14 is set to n, the height of the light-shielding layer 10a is set to H, and the length of the longest straight line drawn perpendicular to the light-shielding layer 10a and the polarizing plate 9 in the plane where the light-shielding layer 10a is formed and between the light-shielding layer 10a and the polarizing plate 9 is set to W, relative to tanθ' θ'1, defined by 1 = W / H and 0° < θ'1 < 90°, is when sinθ1 = n × sin When θ1 is defined as θ'1 and 0°<θ1<90°, it is preferable to determine the refractive index n of the sealing layer 14, the height H of the light-shielding layer 10a, and the length W of the longest straight line in a manner that satisfies θ1≤45°.

[0100] When the refractive index n of the sealing layer 14, the height H of the light-shielding layer 10a, and the length W of the longest straight line are determined in such a way as θ1≤45°, when the user observes the display area DA of the display device 30a at an angle θ relative to the second axis R within the range of 0°≤θ<θ1 (θ1≤45°) (when viewed from the front), since the user is in the position of the front, it is difficult to consider that external light will enter, and the reflection of external light to the vicinity of the front can be reduced.

[0101] Preferably, such as Figure 13 As shown in (b), preferably, when the refractive index of the sealing layer 14 is set to n, the height of the light-shielding layer 10a is set to H, and the width of the sub-pixel RSP·GSP·BSP in the direction perpendicular to the light-shielding layer 10a in the plane where the light-shielding layer 10a is formed is set to L, the refractive index n of the sealing layer 14, the height of the light-shielding layer 10a, and the width L of the sub-pixel RSP·GSP·BSP are determined by θ'2 defined by tanθ'2=L / H and 0°<θ'2<90°, and θ2 defined by sinθ2=n×sinθ'2 and 0°<θ2<90°, so as to satisfy θ2≥60°.

[0102] When the refractive index n of the sealing layer 14, the height H of the light-shielding layer 10a, and the width L of the sub-pixel RSP·GSP·BSP are determined in such a way as θ2≥60°, the emitted light from the light-emitting element 20 can be visually recognized in the range of at least 0° to 60° at an angle θ relative to the second axis R.

[0103] It can maintain the refractive index n of the sealing layer 14. Figure 13 As shown in (b), θ2 is the same as θ2 in Embodiment 1, while the height H of the light-shielding layer 10a is increased. Accordingly, it is possible to increase Figure 13 As shown in (a), W can thus improve the extraction of light from the light-emitting element 20 in the front direction.

[0104] In this embodiment, for example, a material is used such that θ1 is 20° and θ2 is 70°, the height H of the light-shielding layer 10a is 124 μm, the width L of the sub-pixel RSP·GSP·BSP is 100 μm, the length W of the longest straight line is 29 μm, and the refractive index n of the sealing layer 14 is 1.5.

[0105] Furthermore, θ'1 and θ'2 are less than the critical angles θc = 42° when the refractive index n of the sealing layer 14 is 1.5, θ'1 is 13°, and θ'2 is 39°.

[0106] [Implementation Method 3] Next, based on Figure 14 Embodiment 3 of the present invention will now be described. In the display device 30b of this embodiment, the light-shielding layer 10b includes multiple island-shaped light-shielding walls that only surround the corners of the sub-pixels RSP, GSP, and BSP, and the polarizing plate 9a is disposed from the center of the sub-pixels RSP, GSP, and BSP to multiple ends of the sub-pixels RSP, GSP, and BSP not covered by the light-shielding layer 10b, which differs from the display devices 30 and 30a described in Embodiments 1 and 2. Otherwise, it is as described in Embodiments 1 and 2. For ease of explanation, components having the same function as those shown in the drawings of Embodiments 1 and 2 are labeled with the same reference numerals, and their descriptions are omitted.

[0107] Figure 14 This is a top view showing the display area DA of the display device 30b according to Embodiment 3.

[0108] like Figure 14 As shown, the light-shielding layer 10b of the display device 30b includes a plurality of island-shaped light-shielding walls that surround only the corners of the sub-pixels RSP, GSP, and BSP.

[0109] Based on the above configuration, a space is formed between the multiple island-shaped light-shielding walls. Using such a space, in addition to patterning the polarizing plate 9a, it is possible to set it to be a linear polarizing plate 9a, etc.

[0110] like Figure 14 As shown, the polarizing plate 9a of the display device 30b is disposed from the center of the sub-pixels RSP, GSP, and BSP to multiple ends of the sub-pixels RSP, GSP, and BSP that are not covered by the light-shielding layer 10b, that is, disposed to multiple ends of the sub-pixels RSP, GSP, and BSP that are not covered by each of the multiple island-shaped light-shielding walls.

[0111] In addition, such as Figure 14 As shown, the sub-pixels RSP, GSP, and BSP are formed in a rectangular shape, and the multiple island-shaped light-shielding walls are disposed at the four corners of the rectangular sub-pixels RSP, GSP, and BSP.

[0112] Based on the above configuration, a display device 30b can be realized in which external light reflection caused by the first electrode 2 cannot be visually detected in either the left-right or up-down directions, and the extraction of light in the front direction is improved. Furthermore, in the case of a display device where the light emission brightness of the central portion of the sub-pixels RSP, GSP, and BSP is lower than the light emission brightness of the peripheral portion of the sub-pixels RSP, GSP, and BSP, the extraction of light from the light-emitting element 20 can be improved.

[0113] [Implementation Method 4] Next, based on Figure 15 Embodiment 4 of the present invention will now be described. In the display device 30c of this embodiment, the light-shielding layer 10c is formed in a manner that surrounds the sub-pixels RSP, GSP, and BSP, which differs from the display devices 30, 30a, and 30b described in Embodiments 1 to 3. Otherwise, it is as described in Embodiments 1 to 3. For ease of explanation, components having the same function as those shown in the drawings of Embodiments 1 to 3 are labeled with the same reference numerals, and their descriptions are omitted.

[0114] Figure 15 This is a top view showing the display area DA of the display device 30c according to Embodiment 4.

[0115] like Figure 15 As shown, the light-shielding layer 10c of the display device 30c is formed in a manner that surrounds the sub-pixels RSP, GSP, and BSP.

[0116] Based on the above configuration, the external light reflection caused by the first electrode 2 can be made visually undetectable in any direction, including the left-right direction and the up-down direction.

[0117] like Figure 15 As shown, the polarizing plate 9b and the light-shielding layer 10c of the display device 30c are formed separately and overlap with the center of the sub-pixels RSP, GSP and BSP when viewed from above.

[0118] Based on the above configuration, a display device 30c is capable of achieving visually imperceptible external light reflection caused by the first electrode 2 in either the left-right or up-down directions, and improving the extraction of light in the forward direction. Furthermore, in the case of a display device where the luminous intensity of the central portion of the sub-pixels RSP, GSP, and BSP is lower than the luminous intensity of the peripheral portion of the sub-pixels RSP, GSP, and BSP, the extraction of light from the light-emitting element 20 can be improved.

[0119] [Implementation Method 5] Next, based on Figure 16Embodiment 5 of the present invention will now be described. In this embodiment of the display device, the light-shielding layer 10d is formed on the upper surface of the dam 3 with a portion of material 15 that absorbs visible light, which differs from the display devices 30, 30a, 30b, and 30c described in Embodiments 1 to 4. Otherwise, it is as described in Embodiments 1 to 4. For ease of explanation, components having the same function as those shown in the drawings of Embodiments 1 to 4 are labeled with the same reference numerals, and their descriptions are omitted.

[0120] Figure 16 (a) is a cross-sectional view of the display area of ​​the display device according to embodiment 5. Figure 16 (b) is a cross-sectional view of the display area of ​​a modified example of the display device of Embodiment 5.

[0121] like Figure 16 As shown in (a), in the display device of Embodiment 5, a dam 3 is provided to cover the end of the first electrode 2 that reflects visible light, and a light-shielding layer 10d is a portion of the upper surface of the dam 3 on which a material 15 absorbing visible light is formed. That is, the dam 3 is formed to the extent that it contacts the sealing glass 11, and the portion of the dam 3 on which the material 15 absorbing visible light is formed is the light-shielding layer 10d. Furthermore, the material 15 absorbing visible light may, for example, be a negative photosensitive resin containing carbon black.

[0122] Based on the above structure, the alignment of the embankment 3 and the shading layer 10d can be disregarded.

[0123] also, Figure 16 The variation of the display device shown in embodiment 5 (b) lacks the transparent plate 13, which is different from... Figure 16 The display device of Embodiment 5 shown in (a) is different.

[0124] [Implementation Method 6] Next, based on Figure 17 Embodiment 6 of the present invention will now be described. In this embodiment of the display device 30d, the light-shielding layer 10e is disposed only around the sub-pixels of a specific color, which differs from the display devices described in Embodiments 1-5. Otherwise, it is as described in Embodiments 1-5. For ease of explanation, components having the same function as those shown in the drawings of Embodiments 1-5 are labeled with the same reference numerals, and their descriptions are omitted.

[0125] Figure 17 This is a top view showing the display area DA of the display device 30d according to Embodiment 6.

[0126] like Figure 17As shown, the light-shielding layer 10e of the display device 30d is only disposed around the sub-pixels of specific colors, namely the red sub-pixel RSP and the blue sub-pixel BSP. In this embodiment, the case in which the light-shielding layer 10e is only disposed around the red sub-pixel RSP and the blue sub-pixel BSP is used as an example, but it is not limited to this.

[0127] Furthermore, in the display device 30d, the polarizing plate 9 can also be formed in such a way that it covers the entire portion of the pixel PIX except for the right and left ends. This is because the right and left ends of the pixel PIX become the shadow areas of the light-shielding layer 10e, so the polarizing plate 9 may not be required.

[0128] [Implementation Method 7] Next, based on Figure 18 Embodiment 7 of the present invention will now be described. The display device of this embodiment differs from the display devices described in Embodiments 1 to 6 in that it includes a bottom-emitting type light-emitting element 20a. Otherwise, it is as described in Embodiments 1 to 6. For ease of explanation, components having the same function as those shown in the drawings of Embodiments 1 to 6 are labeled with the same reference numerals, and their descriptions are omitted.

[0129] Figure 18 (a) is a cross-sectional view of the display area of ​​the display device according to embodiment 7. Figure 18 (b) is a cross-sectional view of the display area of ​​a modified example of the display device of Embodiment 7.

[0130] like Figure 18 (a) and Figure 18 As shown in (b), the light-emitting element 20a is a bottom-emitting type light-emitting element.

[0131] like Figure 18 (a) and Figure 18As shown in (b), when the light-emitting element 20a has a stacked film with a sequentially stacked structure, that is, when the anode, hole transport layer 4, light-emitting layer 5, electron transport layer 6, and cathode are stacked sequentially from the substrate 1 side, since the cathode is positioned above the anode, in order to form a bottom-emitting type, it is sufficient to set the first electrode 7r that reflects visible light as the cathode and the second electrode 2t that transmits visible light as the anode. On the other hand, although not shown, when the light-emitting element 20a has a stacked film with a reverse structure, that is, when the cathode, electron transport layer 6, light-emitting layer 5, hole transport layer 4, and anode are stacked sequentially from the substrate 1 side, since the anode is positioned above the cathode, in order to form a bottom-emitting type, it is sufficient to set the first electrode 7r that reflects visible light as the anode and the second electrode 2t that transmits visible light as the cathode. As described above, the light-emitting element 20a is a bottom-emitting type, therefore, the direction of light emitted from the light-emitting element 20a, i.e., the light emission direction LD, is as follows. Figure 18 (a) and Figure 18 As shown in (b), it is in the downward direction.

[0132] also, Figure 18 The variation of the display device shown in embodiment 7 (b) lacks the transparent plate 13, which is different from... Figure 18 The display device of embodiment 7 shown in (a) is different.

[0133] 〔Summarize〕 [Aspect 1] A display device, characterized in that it comprises: A light-emitting element is disposed on a substrate and includes: a first electrode that reflects visible light, a second electrode that transmits visible light, and a light-emitting layer disposed between the first electrode and the second electrode; Sub-pixel, which is the light-emitting area of ​​the light-emitting element when viewed from above; A polarizing plate, positioned above the light-emitting element in the light-emission direction (the direction from which light is emitted from the light-emitting element), is arranged to overlap a portion of the sub-pixel when viewed from above; and A light-shielding layer, at least a portion of which surrounds the sub-pixel, is positioned higher than the polarizer in the light emission direction.

[0134] [Aspect 2] In the display device described in Method 1, the light-shielding layer comprises: a linear first light-shielding wall formed along each of two opposing sides of the sub-pixel; and a linear second light-shielding wall.

[0135] [Aspect 3] In the display device described in aspect 2, the polarizing plate includes a portion that is separated from the light-shielding layer and is formed into a straight line at the midpoint between the first light-shielding wall and the second light-shielding wall.

[0136] [Aspect 4] In the display device described in aspect 1, the light-shielding layer comprises a plurality of island-shaped light-shielding walls, the plurality of island-shaped light-shielding walls surrounding only the corners of the sub-pixels.

[0137] [Aspect 5] In the display device described in aspect 4, the polarizing plate is disposed from the center of the sub-pixel to a plurality of ends of the sub-pixel that are not covered by each of the plurality of island-shaped light-shielding walls.

[0138] [Aspect 6] In the display device described in aspect 1, the light-shielding layer is formed in such a way as to surround the sub-pixel.

[0139] [Aspect 7] In the display device described in aspect 6 The polarizing plate is formed separately from the light-shielding layer. When viewed from above, the polarizing plate overlaps with the center of the sub-pixel.

[0140] [Aspect 8] In any of the display devices described in aspects 1 to 7 A transparent plate is disposed above the light-emitting element, the transparent plate being arranged to surround the polarizing plate. The light-shielding layer is disposed on the transparent plate.

[0141] [Aspect 9] In the display device described in aspect 4 or 5 The sub-pixels are formed into a rectangular shape. The multiple island-shaped light-shielding walls are disposed at each of the four corners of the rectangular sub-pixel.

[0142] [Aspect 10] In any of the display devices described in aspects 1 to 9 Includes a dam that covers the end of the first electrode or the second electrode, and the light-shielding layer overlaps with at least a portion of the dam when viewed from above.

[0143] [Aspect 11] In any of the display devices described in aspects 1 to 10, the light-shielding layer comprises a material that absorbs visible light.

[0144] [Aspect 12] In any of the display devices described in aspects 1 to 10 The device includes a dam that covers the end of the first electrode or the second electrode, and the light-shielding layer is a portion of the upper surface of the dam in which a material that absorbs visible light is formed.

[0145] [Aspect 13] In any of the display devices described in aspects 1 to 12 With any point of the sub-pixel as the origin, an arbitrary angle within the plane relative to a first axis passing through the origin is defined as φ, and an arbitrary angle relative to a second axis is defined as θ. The second axis passes through the origin and is orthogonal to the first axis in the vertical direction from the sub-pixel. When light with an angle φ varying between 0° and 360° and an angle θ varying between 0° and 60° is directed toward the sub-pixel, a shadow area is generated in the sub-pixel through the light-shielding layer. The polarizing plate is positioned outside the shaded area.

[0146] [Aspect 14] In any of the display devices described in aspects 1 to 13, a sealing layer is provided such that the sealing layer covers the polarizing plate and, when viewed from above, at least overlaps with the sub-pixels in their entirety.

[0147] [Aspect 15] In the display device described in aspect 14 When the refractive index of the sealing layer is set to n, and The height of the light-shielding layer is set to H, and When the length of the longest straight line drawn between the light-shielding layer and the polarizing plate, perpendicular to both the light-shielding layer and the polarizing plate, and extending between the light-shielding layer and the polarizing plate, is defined as W, Compared to θ'1 defined using tanθ'1=W / H and 0°<θ'1<90°, when θ1 is defined using sinθ1=n×sinθ'1 and 0°<θ1<90°, The refractive index n, the height H, and the length W of the longest straight line are determined in a manner that satisfies θ1≤45°.

[0148] [Aspect 16] In the display device described in aspect 14 or 15 When the refractive index of the sealing layer is set to n, and The height of the light-shielding layer is set to H, and When the width of the sub-pixel in the direction perpendicular to the light-shielding layer within the surface where the light-shielding layer is formed is set to L, Compared to θ'2 defined using tanθ'2=L / H and 0°<θ'2<90°, when θ2 is defined using sinθ2=n×sinθ'2 and 0°<θ2<90°, the refractive index n, the height H, and the width L of the sub-pixel are determined in a manner that satisfies θ2≥60°.

[0149] [Aspect 17] The display device described in any one of aspects 1 to 16 includes: a quarter-wave plate disposed between the light-emitting element and the polarizing plate, which, when viewed from above, at least overlaps with the polarizing plate.

[0150] [Additional Items] This invention is not limited to the embodiments described above, and various modifications can be made within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of this invention. Moreover, new technical features can be formed by combining the technical methods disclosed in each embodiment. Industrial practicality

[0151] This invention can be used in display devices. Explanation of reference numerals in the attached figures

[0152] 1 substrate 2. The first electrode that reflects visible light 2t Second electrode that transmits visible light 7. Second electrode that transmits visible light 7r The first electrode that reflects visible light 8 1 / 4 wavelength plate 9, 9a, 9b polarizing plates 10, 10a, 10b, 10c, 10d, 10e Light-shielding layers 11 Sealed Glass 12 Sealing layer 13 Transparent panels 14 Sealing layer 15. Materials that absorb visible light 19. Inspection of polarizing plates 20, 20a Light-emitting elements Display devices 30, 30a, 30b, 30c, and 30d DA display area NDA border area PIX pixels RSP, GSP, BSP subpixels LD light emission direction

Claims

1. A display device, characterized in that, include: A light-emitting element is disposed on a substrate and includes: a first electrode that reflects visible light, a second electrode that transmits visible light, and a light-emitting layer disposed between the first electrode and the second electrode; Sub-pixel, which is the light-emitting area of ​​the light-emitting element when viewed from above; A polarizing plate, which, when viewed from above, is positioned above the light-emitting element in the light-emitting direction, which is the direction of light emitted from the light-emitting element, to overlap with a portion of the sub-pixel; as well as A light-shielding layer, at least a portion of which surrounds the sub-pixel, is positioned higher than the polarizer in the light emission direction. The light-shielding layer comprises multiple island-shaped light-shielding walls, which surround only the corners of the sub-pixel. The polarizing plate is positioned from the center of the sub-pixel to multiple ends of the sub-pixel that are not covered by each of the multiple island-shaped light-shielding walls.

2. The display device according to claim 1, characterized in that, The light-shielding layer comprises: a first light-shielding wall in the shape of a straight line, which is formed along each of the two opposite sides of the sub-pixel; and a second light-shielding wall in the shape of a straight line.

3. The display device according to claim 2, characterized in that, The polarizing plate includes a portion that is separated from the light-shielding layer and is formed into a straight line at the midpoint between the first light-shielding wall and the second light-shielding wall.

4. The display device according to claim 1, characterized in that, The light-shielding layer is formed in a manner that surrounds the sub-pixel.

5. The display device according to claim 4, characterized in that, The polarizing plate is formed separately from the light-shielding layer. When viewed from above, the polarizing plate overlaps with the center of the sub-pixel.

6. The display device according to any one of claims 1 to 5, characterized in that, A transparent plate is disposed above the light-emitting element, the transparent plate being arranged to surround the polarizing plate. The light-shielding layer is disposed on the transparent plate.

7. The display device according to claim 1, characterized in that, The sub-pixels are formed into a rectangular shape. The multiple island-shaped light-shielding walls are disposed at each of the four corners of the rectangular sub-pixel.

8. The display device according to any one of claims 1 to 5, characterized in that, Includes a dam that covers the end of the first electrode or the second electrode. When viewed from above, the shading layer overlaps with at least a portion of the embankment.

9. The display device according to any one of claims 1 to 5, characterized in that, The light-shielding layer contains a material that absorbs visible light.

10. The display device according to any one of claims 1 to 5, characterized in that, Includes a dam that covers the end of the first electrode or the second electrode. The light-shielding layer is a portion of the upper surface of the embankment in which a material that absorbs visible light is formed.

11. A display device, characterized in that, include: A light-emitting element is disposed on a substrate and includes: a first electrode that reflects visible light, a second electrode that transmits visible light, and a light-emitting layer disposed between the first electrode and the second electrode; Sub-pixel, which is the light-emitting area of ​​the light-emitting element when viewed from above; A polarizing plate, which, when viewed from above, is positioned above the light-emitting element in the light-emitting direction, which is the direction of light emitted from the light-emitting element, to overlap with a portion of the sub-pixel; as well as A light-shielding layer, at least a portion of which surrounds the sub-pixel, is positioned higher than the polarizer in the light emission direction. With any point of the sub-pixel as the origin, an arbitrary angle within the plane relative to a first axis passing through the origin is defined as φ, and an arbitrary angle relative to a second axis is defined as θ. The second axis passes through the origin and is orthogonal to the first axis in the vertical direction from the sub-pixel. When light with an angle φ varying between 0° and 360° and an angle θ varying between 0° and 60° is directed toward the sub-pixel, a shadow area is generated in the sub-pixel through the light-shielding layer. The polarizing plate is positioned outside the shaded area.

12. The display device according to any one of claims 1 to 5 and 11, characterized in that, A sealing layer is provided such that the sealing layer covers the polarizing plate and, when viewed from above, at least overlaps with the sub-pixel as a whole.

13. A display device, characterized in that, include: A light-emitting element is disposed on a substrate and includes: a first electrode that reflects visible light, a second electrode that transmits visible light, and a light-emitting layer disposed between the first electrode and the second electrode; Sub-pixel, which is the light-emitting area of ​​the light-emitting element when viewed from above; A polarizing plate, which, when viewed from above, is positioned above the light-emitting element in the light-emitting direction, which is the direction of light emitted from the light-emitting element, to overlap with a portion of the sub-pixel; as well as A light-shielding layer, at least a portion of which surrounds the sub-pixel, is positioned higher than the polarizer in the light emission direction. A sealing layer is provided such that it covers the polarizing plate and, when viewed from above, at least entirely overlaps with the sub-pixels. When the refractive index of the sealing layer is set to n, and The height of the light-shielding layer is set to H, and When the length of the longest straight line drawn between the light-shielding layer and the polarizing plate, perpendicular to both the light-shielding layer and the polarizing plate, and extending between the light-shielding layer and the polarizing plate, is defined as W, Compared to θ'1 defined by tanθ'1=W / H and 0°<θ'1<90°, When θ1 is defined as sinθ1 = n × sinθ'1 and 0° < θ1 < 90° The refractive index n, the height H, and the length W of the longest straight line are determined in a manner that satisfies θ1≤45°.

14. A display device, characterized in that, include: A light-emitting element is disposed on a substrate and includes: a first electrode that reflects visible light, a second electrode that transmits visible light, and a light-emitting layer disposed between the first electrode and the second electrode; Sub-pixel, which is the light-emitting area of ​​the light-emitting element when viewed from above; A polarizing plate, which, when viewed from above, is positioned above the light-emitting element in the light-emitting direction, which is the direction of light emitted from the light-emitting element, to overlap with a portion of the sub-pixel; as well as A light-shielding layer, at least a portion of which surrounds the sub-pixel, is positioned higher than the polarizer in the light emission direction. A sealing layer is provided such that it covers the polarizing plate and, when viewed from above, at least entirely overlaps with the sub-pixels. When the refractive index of the sealing layer is set to n, and The height of the light-shielding layer is set to H, and When the width of the sub-pixel in the direction perpendicular to the light-shielding layer within the surface where the light-shielding layer is formed is set to L, Compared to θ'2 defined by tanθ'2=L / H and 0°<θ'2<90°, When θ2 is defined using sinθ2=n×sinθ'2 and 0°<θ2<90° The refractive index n, the height H, and the width L of the sub-pixel are determined in a manner that satisfies θ2≥60°.

15. The display device according to any one of claims 1 to 5 and 11, 13 and 14, characterized in that, include: A quarter-wavelength plate is disposed between the light-emitting element and the polarizing plate, which, when viewed from above, overlaps at least with the polarizing plate.

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