JP2020181696A - Organic electroluminescent display device - Google Patents

Abstract

To improve light transmissivity of an organic EL display device.SOLUTION: An organic EL display device 10 includes: a substrate 11 having a first surface and a second surface opposite to the first surface; a plurality of first electrodes 13 arranged in a matrix state on the first surface of the substrate 11; a plurality of organic compound layers 14 respectively positioned on the plurality of first electrodes 13; a plurality of second electrodes 15 which are positioned on the plurality of organic compound layers 14 having a plurality of openings 151 positioned between organic compound layers 14 adjacent to each other in a plan view from a first surface side toward a second surface side; and a lens 18 provided at a position opposed to at least some of the openings 151.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to an organic electroluminescence display device.

An organic EL display device using an organic electroluminescence (EL) element has high visibility due to self-luminous emission, is an all-solid-state display device unlike a liquid crystal display device, is not easily affected by temperature changes, has a large viewing angle, etc. In recent years, it has been put into practical use as a full-color display device because of its advantages. It is known that an organic EL display device used in a smartphone or the like is provided with a proximity sensor or the like including a light receiving element and a light emitting element on the same plane as or different from the organic EL element.

JP-A-2019-33071

In organic EL display devices, it is required to widen the display area on which images and the like are displayed, and in particular, in smartphones and the like where the area of the display area is limited, it is required to expand the display area to the entire screen surface. is there. A smartphone or the like may be provided with an image sensor, a proximity sensor, or the like, but it is difficult to expand the display area over the entire screen unless the organic EL display device has translucency. Generally, in an organic EL display device, since it is necessary to take out the light generated in the organic light emitting layer in a predetermined direction, a metal material or the like having poor light transmission may be used as the cathode electrode. Therefore, it is difficult to use the entire screen composed of the organic EL display device as the display area. In this respect, for example, a transmission area capable of transmitting light is formed between subpixels in the organic EL element, and light (infrared ray, etc.) emitted from the light emitting element is reflected by the object through this transmission area, and the adjacent transmission area It is considered that the entire screen can be configured by an organic EL display device and the display area on which an image or the like is displayed can be expanded by making the light receiving light received by the light receiving element through the light receiving element or enabling imaging through the transmission area.

On the other hand, in order to be able to display a high-definition image, it is also required to increase the pixel density in the organic EL display device. However, when the pixel density is increased, the transmission area located between the sub-pixels tends to be narrowed, so that the transmission performance may deteriorate. In order not to lower the pixel density and not to narrow the transmission area, it is conceivable to reduce the organic compound layer (organic light emitting layer) in the organic EL element, but the brightness of the organic EL display device is lowered. There is a risk.

In view of the above problems, one object of the present disclosure is to provide an organic electroluminescence display device having excellent light transmission performance.

A first aspect of the present disclosure is a substrate having a first surface and a second surface facing the first surface, a plurality of first electrodes located in a matrix on the first surface of the substrate, and the above. The said, which has a plurality of organic compound layers each located on a plurality of first electrodes, and a plurality of openings located between the adjacent organic compound layers in a plan view from the first surface side to the second surface side. It is an organic electroluminescence display device including a second electrode located on a plurality of organic compound layers and a lens provided at a position facing at least a part of the openings.

As a second aspect of the present disclosure, in the first aspect, the lens may be provided at a position facing the opening on the side opposite to the substrate with respect to the second electrode.
As a third aspect of the present disclosure, in the first aspect, the lens may be provided at a position facing the opening on the substrate side with respect to the second electrode.
As a fourth aspect of the present disclosure, in the first aspect, the lens is a first lens provided at a position facing the opening on the side opposite to the substrate with respect to the second electrode. It may include a second lens provided at a position facing the opening on the substrate side with reference to the second electrode.

As a fifth aspect of the present disclosure, in each of the first to fourth aspects, a plan view from the second electrode side toward the first electrode side or a plan view from the first electrode side toward the second electrode side In a plan view, the lens may be provided at a position that does not overlap with the first electrode.

As a sixth aspect of the present disclosure, in the fourth aspect, the light emitted from the organic compound layer is taken out from the second electrode side and viewed from the second electrode side toward the first electrode side. Alternatively, in a plan view from the first electrode side to the second electrode side, the second lens may be provided at a position where a part of the second lens overlaps the organic compound layer.

As a seventh aspect of the present disclosure, in each of the first to sixth aspects, the organic compound layer may include an organic light emitting layer.
As an eighth aspect of the present disclosure, in each of the first to seventh aspects, the lens may include a cylindrical lens.
As a ninth aspect of the present disclosure, in each of the first to seventh aspects, the lens may include a spherical lens.

According to the present disclosure, an organic electroluminescence display device having excellent transmission performance can be provided.

FIG. 1 is a cut end view showing a schematic configuration of a first aspect of an organic electroluminescence (EL) display device according to an embodiment of the present disclosure. FIG. 2 is a cut end view showing a schematic configuration of a second aspect of the organic electroluminescence (EL) display device according to the embodiment of the present disclosure. FIG. 3 is a cut end view showing a schematic configuration of a third aspect of the organic electroluminescence (EL) display device according to the embodiment of the present disclosure. FIG. 4 is a cut end view showing a schematic configuration of a fourth aspect of the organic electroluminescence (EL) display device according to the embodiment of the present disclosure. FIG. 5 is a cut end view showing a schematic configuration of a fifth aspect of the organic electroluminescence (EL) display device according to the embodiment of the present disclosure. FIG. 6 is a plan view showing an example of the positional relationship between the first electrode, the organic compound layer, the second electrode, and the lens in one embodiment of the present disclosure. FIG. 7 is a plan view showing another example of the positional relationship between the first electrode, the organic compound layer, the second electrode, and the lens in one embodiment of the present disclosure. FIG. 8 is a cut end view for explaining a state in which light passes through an opening through a lens in an organic electroluminescence (EL) display device according to an embodiment of the present disclosure. FIG. 9 is a cut end view for explaining the positional relationship between the first electrode, the organic compound layer, and the lens in one embodiment of the present disclosure. FIG. 10A is a cut end view showing one step of a method for manufacturing an organic electroluminescence (EL) display device according to an embodiment of the present disclosure. FIG. 10B is a cut end view showing a step of a method for manufacturing an organic electroluminescence (EL) display device according to an embodiment of the present disclosure, and a step following FIG. 10A. FIG. 10C is a cut end view showing a step of a method for manufacturing an organic electroluminescence (EL) display device according to an embodiment of the present disclosure, and a step following FIG. 10B. FIG. 10D is a cut end view showing a step of a method for manufacturing an organic electroluminescence (EL) display device according to an embodiment of the present disclosure, and a step following FIG. 10C. FIG. 11A is a cut end view showing one step of manufacturing a lens according to the embodiment of the present disclosure. FIG. 11B is a cut end view showing a step of manufacturing the lens according to the embodiment of the present disclosure, which follows the step of FIG. 11A. FIG. 11C is a cut end view showing a step of manufacturing the lens according to the embodiment of the present disclosure, which follows the step of FIG. 11B. FIG. 12A is a cut end view showing one step of manufacturing a lens according to the embodiment of the present disclosure. FIG. 12B is a cut end view showing a step of manufacturing the lens according to the embodiment of the present disclosure, which follows the step of FIG. 12A. FIG. 13A is a cut end view showing one step of manufacturing a lens according to the embodiment of the present disclosure. FIG. 13B is a cut end view showing a step of manufacturing the lens according to the embodiment of the present disclosure, which follows the step of FIG. 13A. FIG. 14A is a cut end view showing one step of manufacturing a lens according to the embodiment of the present disclosure. FIG. 14B is a cut end view showing a step of manufacturing the lens according to the embodiment of the present disclosure, which follows the step of FIG. 14A.

In the present specification and the present drawings, unless otherwise specified, terms such as "board", "sheet", and "film" are not distinguished from each other based solely on the difference in designation. For example, "board" is a concept that includes members that can be called sheets or films. Further, the "plane (sheet surface, film surface)" is a plate-like member (sheet-like member) that is a target when the target plate-like (sheet-like, film-like) member is viewed as a whole and in a broad sense. , A film-like member) that coincides with the plane direction. Further, the normal direction used for a plate-shaped (sheet-shaped, film-shaped) member refers to a normal direction with respect to a surface (sheet surface, film surface) of the member. Furthermore, the terms used in this specification, such as "parallel" and "orthogonal", and the values of length and angle, which specify the shape and geometric conditions and their degrees, are bound by strict meanings. Instead, the interpretation will include the range in which similar functions can be expected.

Unless otherwise specified, the present specification and the present drawings specify shapes, geometric conditions, and their degrees, for example, terms such as "parallel" and "orthogonal", and length and angle values. Is to be interpreted including the range in which similar functions can be expected without being bound by the strict meaning.

In the present specification and the drawings, a configuration such as a member or region is "above (or below)", "above (or below)" another configuration such as another member or region. ) ”Or“ upward (or downward) ”, unless otherwise specified, not only when one configuration is in direct contact with another, but also with one configuration and another. It shall be interpreted including the case where another configuration is included between. Further, unless otherwise specified, the term “upper (or upper or upper) or lower (or lower or lower) may be used for explanation, but the vertical direction may be reversed.

In the present specification and the present drawings, unless otherwise specified, the same parts or parts having similar functions are designated by the same reference numerals or similar reference numerals, and the repeated description thereof may be omitted. In addition, the dimensional ratio of the drawing may differ from the actual ratio for convenience of explanation, or a part of the configuration may be omitted from the drawing.

Unless otherwise specified, this specification and the present drawings may be combined with other embodiments and modifications to the extent that there is no contradiction. Further, other embodiments and modifications thereof can be combined within a range that does not cause a contradiction. Further, the modified examples can be combined as long as there is no contradiction.

Unless otherwise specified in the present specification and the present drawings, when a plurality of steps are disclosed with respect to a method such as a manufacturing method, other steps not disclosed are carried out between the disclosed steps. You may. In addition, the order of the disclosed steps is arbitrary as long as there is no contradiction.

Unless otherwise specified in the present specification and the drawings, the numerical range represented by the symbol "~" includes the numerical values placed before and after the symbol "~". For example, the numerical range defined by the expression "34 to 38% by mass" is the same as the numerical range defined by the expression "34% by mass or more and 38% by mass or less".

Embodiments of the present disclosure will be described with reference to the drawings. The embodiments shown below are examples of the embodiments of the present disclosure, and the present disclosure is not construed as being limited to these embodiments.

FIG. 1 is a cut end view showing a schematic configuration of a first aspect of the organic electroluminescence (EL) display device according to the present embodiment, and FIG. 2 is a cut end view of the organic electroluminescence (EL) display device according to the present embodiment. FIG. 3 is a cut end view showing a schematic configuration of a second aspect, FIG. 3 is a cut end view showing a schematic configuration of a third aspect of the organic electroluminescence (EL) display device according to the present embodiment, and FIG. FIG. 5 is a cut end view showing a schematic configuration of a fourth aspect of the organic electroluminescence (EL) display device according to the present embodiment, and FIG. 5 is a fifth aspect of the organic electroluminescence (EL) display device according to the present embodiment. It is a cut end view which shows the schematic structure.

As shown in FIGS. 1 to 5, the organic EL display device 10 includes a substrate 11 having a TFT element (not shown), a first interlayer insulating film 12, a first electrode 13, an organic compound layer 14, and a second electrode 15. And the second interlayer insulating film 16 may be configured as a laminate including the second interlayer insulating film 16 in this order. In the present embodiment, the organic EL display device 10 may be of the bottom emission type in which the light generated in the organic compound layer 14 is extracted from the substrate 11 side, or the light generated in the organic compound layer 14 is the second. It may be a top emission type taken out from the interlayer insulating film 16 side.

The substrate 11 is a transparent substrate having a first surface 11A and a second surface 11B facing the first surface 11A, and for example, a TFT element may be provided on the first surface 11A side. As the substrate 11, for example, a glass substrate such as alkaline glass, quartz glass, borosilicate glass, non-alkali glass; a sapphire substrate; a resin substrate such as an acrylic resin, a polyester resin, a polycarbonate resin, a polyolefin resin, or a cycloolefin polymer is used. Can be.

The size (size in plan view) and thickness of the substrate 11 can be appropriately set in consideration of the size of the organic EL display device 10 according to the present embodiment, the handleability of the substrate 11, and the like. It is not limited.

Either one of the first electrode 13 and the second electrode 15 may form an anode (anode electrode), and the other of the first electrode 13 and the second electrode 15 may form a cathode (cathode electrode). For example, the first electrode 13 may be an anode electrode and the second electrode 15 may be a cathode electrode. Of course, the first electrode 13 may be the cathode electrode and the second electrode 15 may be the anode electrode. The organic compound layer 14 sandwiched between the first electrode 13 and the second electrode 15 has a hole injection layer, a hole transport layer, an organic light emitting layer, and electron transport from the first electrode 13 side to the second electrode 15 side. It may be a laminated body including a layer and an electron injection layer in this order. When a driving voltage is applied from the first electrode 13 side, holes are injected into the organic light emitting layer from the first electrode 13, and electrons are injected into the organic light emitting layer from the second electrode 15. The energy generated by the bonding of holes and electrons injected into the organic light emitting layer excites the organic material constituting the organic light emitting layer, and the organic light emitting layer emits light when returning from the excited state to the ground state.

The first electrode 13 may be made of a transparent conductive material that is relatively easy to transmit light, and the second electrode 15 may be made of a conductive material that is relatively difficult to transmit light. Of course, the second electrode 15 may be made of a conductive material that is relatively easy to transmit light, and the first electrode 13 may be made of a conductive material that is relatively difficult to transmit light. Examples of the transparent conductive material include ITO (Indium Tin Oxide), InZNO (Indium Zinc Oxide), AlZNO (Aluminum Zinc Oxide), and AlTO (Aluminum Tin Oxide). (Indium tin oxide) and the like. Examples of the conductive material that is relatively difficult to transmit light include metal materials such as Mg, Ag, Mg / Ag (magnesium-silver alloy), Al, and Ca. It is considered that these metal materials have a relatively low work function and can efficiently inject electrons into the electron injecting layer of the organic compound layer 14. In addition, "transparency" in this embodiment can be defined by the transmittance (%) of light, and of light having a wavelength corresponding to an application that is required to be transparent or is desirable to be transparent. It may be defined by the transmittance (%). For example, in order to provide the organic EL display device 10 with a proximity sensor including a light emitting element that emits near-infrared light and a light receiving element that receives the near-infrared light, it is required or desirable to be transparent. In some cases, "transparency" can be defined by the transmittance (%) of light having a wavelength of 700 nm to 1400 nm. Further, in order to provide the image pickup element in the organic EL display device 10, it is required to be transparent or it is desirable that it is transparent. “Transparency” depends on the transmittance (%) of light having a wavelength of 400 nm to 700 nm. Can be defined. Specifically, "transparent" means that the transmittance of light in the wavelength range corresponding to each application is 30% or more, and preferably the transmittance of light in the wavelength range corresponding to each application or the like. May be 80% or more. Therefore, for example, the transmittance of light in the wavelength range according to each application in a conductive material that is relatively difficult to transmit light is less than 30%, and preferably the transmittance of light in the wavelength range corresponding to each application or the like. The rate may be 5% or less. The transmittance of light in each wavelength range can be measured using, for example, a spectroscopic haze meter (product name: HSP-150VIR, manufactured by Murakami Color Technology Research Institute).

The first electrode 13 may be provided at a position corresponding to the organic compound layer 14. That is, a plurality of first electrodes 13 are provided in a matrix on the first interlayer insulating film 12. The "matrix-like" means a state in which predetermined members are arranged in parallel at a predetermined pitch in one direction on a predetermined plane and in a direction orthogonal to the one direction. For example, "a plurality of first electrodes 13 are provided in a matrix on the first interlayer insulating film 12" means that each first electrode 13 is provided in one direction (for example, in FIG. It means that they are parallel at a predetermined pitch in each of the first direction D1) shown in 6 and 7 and the direction orthogonal to the one direction (for example, the second direction D2 shown in FIGS. 6 and 7). The pitch of the first electrode 13 parallel to the first direction D1 and the pitch of the first electrode 13 parallel to the second direction may be the same or different.

The plan-view shape of the first electrode 13 may be, for example, a substantially circular shape, an oval shape, a polygonal shape, a striped shape, or the like. In addition, "omitted" is a concept including a manufacturing error at the time of forming the first electrode 13, and for example, in the case of a substantially circular shape, the range of the minor axis when the major axis is 1 is 0.80. , 0.83 and 0.86 may be defined by the value of the first group and the value of the second group including 0.89, 0.92 and 0.95. For example, the lower limit of the minor axis range may be set by any one of the values included in the first group described above. For example, the lower limit of the minor axis range may be 0.80 or more, 0.83 or more, or 0.86 or more. Further, the upper limit of the range of the minor axis may be determined by any one of the values included in the second group described above. For example, the upper limit of the minor axis range may be 0.89 or less, 0.92 or less, or 0.95 or less. The range of the minor axis may be determined by a combination of any one of the values included in the first group described above and any one of the values included in the second group described above, eg, It may be 0.80 or more and 0.95 or less, 0.83 or more and 0.92 or less, or 0.86 or more and 0.89 or less. Further, the range of the minor axis may be determined by any combination of any two of the values included in the first group described above, and may be, for example, 0.80 or more and 0.86 or less. It may be 83 or more and 0.86 or less. Further, the range of the minor axis may be determined by any combination of any two of the values included in the second group described above, and may be, for example, 0.89 or more and 0.95 or less. It may be 92 or more and 0.95 or less.

In a plan view from the second interlayer insulating film 16 to the substrate 11, the first electrode 13 may be surrounded by, for example, an insulating film 17 made of polyimide or the like. That is, the insulating film 17 may be positioned so as to overlap the outer peripheral edge of the first electrode 13 in the plan view.

The second electrode 15 is a common electrode for injecting electrons into each organic compound layer 14. The second electrode 15 has an opening 151 located between the adjacent organic compound layers 14 in a plan view on the first surface 11A side of the substrate 11. As shown in FIGS. 6 and 7, the opening 151 is located substantially in the center of the region surrounded by the four organic compound layers 14 (subpixels) (the rectangular region shown by the alternate long and short dash line in FIGS. 6 and 7). It may be located. When the second electrode 15 is made of a conductive material that is relatively difficult to transmit light, the presence of the opening 151 makes it easy for light traveling in the thickness direction of the organic EL display device 10 to be transmitted.

The opening 151 included in the second electrode 15 may have a substantially circular shape (see FIGS. 6 and 7), an oval shape, a polygonal shape, or the like. By increasing the opening area (total opening area) of the opening 151 as much as possible, the transmission performance of the organic EL display device 10 can be improved. It is considered that the larger the opening area (total opening area) of the opening 151, the larger the electric resistance of the second electrode 15 and the larger the power consumption. That is, it can be said that there is a trade-off relationship between the transmission performance and the magnitude of power consumption in the organic EL display device 10. Further, in order to increase the opening area (total opening area) of the opening 151, it is conceivable to reduce the size of the organic compound layer 14 or increase the pitch of the adjacent organic compound layers 14. However, it is presumed that if the size of the organic compound layer 14 is reduced, the brightness of the organic EL display device is reduced. Further, if the pitch of the adjacent organic compound layers 14 is increased, it is presumed that the image displayed on the organic EL display device becomes coarse. As will be described later, the organic EL display device 10 according to the present embodiment has an effect that the lens 18 can be provided to improve the transmission performance and suppress the increase in power consumption. obtain. Further, by providing the lens 18, it is not necessary to reduce the size of the organic compound layer 14 or increase the pitch of the adjacent organic compound layer 14 for the purpose of improving the transmittance, and the organic EL The effect that the brightness of the display device 10 can be increased, the pixel density can be increased, and a high-definition image can be displayed is also achieved.

The size of the opening 151 is such that the first electrode 13 is covered by the second electrode 15 in a plan view from the second interlayer insulating film 16 to the substrate 11, and the resistance of the second electrode 15 becomes large and consumed. It suffices as long as the electric power does not become too large, and is not particularly limited.

The organic compound layer 14 arranged between the pair of the first electrode 13 and the second electrode 15 is a red organic compound layer 14R, a green organic compound layer 14G, and a blue organic compound, each of which constitutes a unit pixel of an organic EL display device. The compound layer 14B may be contained, or a white organic compound layer may be contained. The red organic compound layer 14R, the green organic compound layer 14G, and the blue organic compound layer 14B emit red light, green light, and blue light, respectively. The white organic compound layer emits white light. When the organic compound layer 14 includes the white organic compound layer, a color filter may be provided as long as the organic EL display device 10 displays an image or the like in color. Even when the organic compound layer 14 includes the red organic compound layer 14R, the green organic compound layer 14G, and the blue organic compound layer 14B, a color filter having a coloring layer corresponding to each organic compound layer 14R, 14G, 14B is provided. It may be. The materials constituting the red organic compound layer 14R, the green organic compound layer 14G, and the blue organic compound layer 14B are particularly those containing a fluorescent organic compound that emits light in a desired color when a predetermined voltage is applied. It is not limited. Examples of the fluorescent organic compound include quinolinol complex, oxazole complex, various laser dyes, polyparaphenylene vinylene and the like. Since the organic compound layer 14 is provided on the first electrode 13 arranged in a matrix on the first interlayer insulating film 12, the organic compound layer 14 is also provided in a mattrix shape.

The TFT element can control the voltage selectively applied from the pair of the first electrode 13 and the second electrode 15 to the red organic compound layer 14R, the green organic compound layer 14G, and the blue organic compound layer 14B. As the TFT element, a known example, a polycrystalline silicon TFT or the like can be used. The TFT element is connected to the first electrode 13 via a wiring electrode that penetrates the first interlayer insulating film 12 formed on the TFT element.

As the material constituting the first interlayer insulating film 12 and the second interlayer insulating film 16, for example, a material having an insulating property can be used. Examples of the material constituting the first interlayer insulating film 12 and the second interlayer insulating film 16 include an inorganic material such as silicon oxide and a resin material such as a photoresist and an acrylic resin.

An insulating film having a thickness of about 0.2 nm to 3.0 nm may be provided between the second electrode 15 and the organic compound layer 14 (electron injection layer). It is presumed that the provision of this insulating film facilitates the injection of electrons from the second electrode 15 into the organic compound layer 14 (electron injection layer) due to the tunnel effect. Examples of the material constituting the insulating film include lithium fluoride (LiF), alumina (Al ₂ O ₃ ), polymethyl methacrylate (PMMA) and the like. When the insulating film is provided between the second electrode 15 and the organic compound layer 14, the organic compound layer 14 is a hole injection layer from the first electrode 13 side toward the second electrode 15 side. , The hole transport layer, the organic light emitting layer and the electron transport layer may be included in this order. In this case, it is considered that the insulating film can function as an electron injection layer.

In the organic EL display device 10 according to the present embodiment, the lens 18 may be provided at a position facing the opening 151 of the second electrode 15. Generally, in an organic EL display device including a second electrode (cathode electrode) having an opening, in the thickness direction thereof (for example, in the case of the organic EL display device 10 shown in FIG. 1, the substrate 11 to the second interlayer insulating film 16 Most of the light traveling in the direction toward or vice versa is difficult to pass through the organic EL display device. It is considered that the light transmitted through the organic EL display device (for example, external light) passes through the opening of the second electrode, but the material through which the second electrode is relatively difficult to transmit light (for example, magnesium, etc.) It is presumed that this is because a large amount of light is reflected on the surface of the second electrode when it is made of a metal material such as silver or magnesium-silver alloy. As a result, there is a problem that it is difficult to improve the transmittance of the organic EL display device. In the organic EL display device 10 according to the present embodiment, the lens 18 is provided at a position facing the opening 151 of the second electrode 15, and when the lens 18 is not provided, the second electrode 15 is provided. Even if the light travels in a direction that is reflected on the surface of the lens 18, it is focused toward the opening 151 through the lens 18 and easily passes through the opening 151, so that the transmittance is improved. (See Fig. 8).

The lens 18 may be provided at a position facing all the openings 151 of the second electrode 15, or may be provided at a position facing a part of the openings 151. When the organic EL display device 10 according to the present embodiment is a so-called transmissive organic EL display device 10 in which the back surface side of the organic EL display device 10 can be visually recognized when the observer side is the front surface. The lens 18 may be provided at a position facing all the openings 151, but the lens may be provided at a position facing a part of the openings 151 according to the light transmittance required by the organic EL display device 10. 18 may be provided. Further, in a device including the organic EL display device 10 (for example, a smartphone or the like), a light emitting element that emits infrared light through one opening 151 and a light receiving element that receives the infrared light through the other opening 151 are included. When a proximity sensor or the like is provided, the lens 18 may be provided at a position facing the opening 151 through which the infrared light passes.

As a first aspect (see FIG. 1) of the organic EL display device 10, the lens 18 is opened in a side view in a state where the first substrate 11 is positioned downward and the second interlayer insulating film 16 is positioned upward. It may be provided above the portion 151, for example, at a position facing the opening 151 on the second interlayer insulating film 16.

As a second aspect of the organic EL display device 10 (see FIG. 2), in a side view in a state where the first substrate 11 is positioned downward and the second interlayer insulating film 16 is positioned upward, the lens 18 is opened. It may be provided at a position facing the opening 151 below the portion 151, for example, below the insulating film 17 surrounding the first electrode 13.

As the third aspect (see FIG. 3) and the fourth aspect (FIG. 4 aspect) of the organic EL display device 10, the first substrate 11 is positioned downward and the second interlayer insulating film 16 is positioned upward. In the side view, the lens 18 is provided above the opening 151, for example, at a position facing the opening 151 on the second interlayer insulating film 16, and below the opening 151, for example. It may include a second lens 182 provided at a position facing the opening 151 below the insulating film 17 surrounding the first electrode 13. In this case, when the first lens 181 is provided above the opening 151, the second lens 182 may not be provided below the opening 151, and the second lens 182 may not be provided below the opening 151. When the lens 182 is provided, the first lens 181 may not be provided above the opening 151 (see FIG. 3). Further, the first lens 181 may be provided above the opening 151, and the second lens 182 may be provided below the opening 151 (see FIG. 4).

As a fifth aspect (see FIG. 5) of the organic EL display device 10, the lens 18 is opened in a side view in a state where the first substrate 11 is positioned downward and the second interlayer insulating film 16 is positioned upward. It may be provided above the portion 151, for example, at a position facing the opening 151 on the second interlayer insulating film 16 as well as a position facing the organic compound layer 14. In the top emission type organic EL display device 10 in which the light generated in the organic compound layer 14 is taken out from the second interlayer insulating film 16 side, the light generated in the organic compound layer 14 is taken out through the lens 18 and is organic. The brightness of the EL display device 10 can be further increased.

The shape of the lens 18 is not particularly limited, and may be, for example, a spherical lens or a cylindrical lens. When the shape of the lens 18 is a spherical lens, the lens 18 may be provided for each opening 151 (see FIG. 6). When the shape of the lens 18 is a cylindrical lens, the lens 18 may be provided for a plurality of openings 151 (see FIG. 7).

The material constituting the lens 18 may be a material having light transmittance, for example, a resin material (organic material) such as a photosensitive resist material, or an inorganic material such as SiO _2. Good. The material constituting the lens 18 can be selected with a relatively high degree of freedom depending on the optical design.

In a plan view from the second electrode 15 side to the first electrode 13 side, the size of the lens 18 is such that the light incident on the lens 18 (for example, external light) passes through the opening 151, that is, the opening. The size may be large enough to cover the portion 151, but the size may be such that a part of the lens 18 does not overlap the light emitting region 14A of the organic compound layer 14 so as not to overlap the first electrode 13. It may be of any size. In the organic EL display device 10 according to the present embodiment, it is presumed that light is emitted in a part of the light emitting region 14A of the organic compound layer 14. In the present embodiment, since the outer peripheral edge of the first electrode 13 is covered with the insulating layer 17, the region on the first electrode 13 surrounded by the insulating layer 17 comes into direct contact with the organic compound layer 14. ing. Since holes are injected into the organic compound layer 14 from the region on the first electrode 13 in the thickness direction of the organic EL display device 10, the region corresponding to the region in the organic compound layer 14 emits light. It is considered to be region 14A (see FIG. 9). Therefore, when a part of the lens 18 overlaps the light emitting region 14A of the organic compound layer 14, a part of the light generated in the organic compound layer 14 and taken out to the second interlayer insulating film 16 side or the substrate 11 side is a lens. It will pass through 18. As a result, the direction in which light is extracted in the organic EL display device 10 changes, which may make it difficult to display an image or the like in high definition. Therefore, the size of the lens 18 is such that it does not overlap the light emitting region 14A of the organic compound layer 14, preferably the size that does not overlap the first electrode 13, and the lens 18 emits light of the organic compound layer 14. By being provided at a position that does not overlap with the region 14A, preferably at a position that does not overlap with the first electrode 13, light can be extracted in a desired direction, and an image or the like can be displayed in high definition. Can be played.

When the organic EL display device 10 according to the present embodiment is a top emission type that extracts light generated in the organic compound layer 14 from the second interlayer insulating film 16 side, it is from the first electrode 13 side to the second electrode side. The size of the second lens 182 provided at the position facing the opening 151 is such that a part of the second lens 182 overlaps the light emitting region 14A and the first electrode 13 of the organic compound layer 14. It may be the size. In this case, since the light generated in the organic compound layer 14 is taken out from the side opposite to the second lens 182 and does not pass through the second lens 182, the direction in which the light is taken out in the organic EL display device 10 This is because there is no risk of the problem of changing.

In the organic EL display device 10 having the above-described configuration, the thickness direction of the organic EL display device 10 (for example, in the case of the organic EL display device 10 shown in FIG. 1, the direction from the substrate 11 toward the second interlayer insulating film 16). Light traveling in the opposite direction (or vice versa) passes through the lens 18 (first lens 181 and / or second lens 182) provided at a position facing the opening 151 and the opening 151. Since the light is focused toward, the light transmission rate in the thickness direction of the organic EL display device 10 can be improved. Therefore, according to the present disclosure, it is possible to provide an organic EL display device 10 having excellent transmission performance.

An example of a manufacturing method of the organic EL display device 10 having the above-described configuration will be described. 10A to 10D are cut end views for explaining each step of the manufacturing method of the organic EL display device 10 according to the present embodiment. In the following, a method of manufacturing the organic EL display device 10 having the configuration shown in FIG. 1 will be described as an example.

A substrate 11 having a first surface 11A and a second surface 11B facing the first surface 11A and having a TFT element (not shown) and a first interlayer insulating film 12 on the first surface 11A is prepared. The first electrode 13 is formed at a predetermined position on the one-thin film transistor insulating film 12 (see FIG. 10A). For example, a thin-film deposition mask having through holes corresponding to the first electrode 13 is prepared, and a material constituting the first electrode 13 (for example, a transparent conductive material such as ITO or InZNO) is first passed through the vapor deposition mask. The first electrode 13 may be formed by vacuum-depositing at a predetermined position on the interlayer insulating film 12. Further, a material constituting the first electrode 13 (for example, a transparent conductive material such as ITO or InZNO) is formed on the first interlayer insulating film 12, and the first interlayer insulating film 12 is subjected to a photolithography method. The first electrode 13 may be formed at a predetermined position. A through hole via may be formed in the first interlayer insulating film 12 at a predetermined position (position where the first electrode 13 is formed) on the first interlayer insulating film 12, and the first interlayer insulating film 12 may have a through hole via at the predetermined position. By forming the one electrode 13, the first electrode 13 and the TFT element can be electrically connected to each other via the through-hole via.

Next, an insulating film (for example, polyimide) covering the first electrode 13 and the first interlayer insulating film 12 is formed by a conventionally known coating method (for example, a die coating method, a spin coating method, etc.), and the insulating film is patterned. As a result, an insulating film 17 surrounding the first electrode 13 is formed (see FIG. 10B).

Subsequently, the organic compound layer 14 is formed on the exposed first electrode 13 (see FIG. 10C). For example, a vapor deposition mask having through holes corresponding to the organic compound layer 14 is prepared, and a fluorescent organic compound such as a material constituting the organic compound layer 14 (for example, a quinolinol complex, an oxazole complex, various laser dyes, or polyparaphenylene vinylene) is prepared. Etc.) may be vacuum-deposited on the first electrode 13 via a vapor deposition mask to form the organic compound layer 14. If desired, an insulating film having a thickness of about 0.2 nm to 3.0 nm (for example, lithium fluoride (LiF) or the like) may be formed on the organic compound layer 14.

The second electrode 15 is formed on the organic compound layer 14, and the second interlayer insulating film 16 is formed on the second electrode 15 (see FIG. 10D). For example, a metal constituting the second electrode 15 (for example, magnesium (Mg), silver (Ag), magnesium-silver alloy (Mg / Ag), etc.) is vacuum-deposited to cover the organic compound layer 14 and the insulating film 17. The second electrode 15 may be formed by forming a layer and forming an opening 151 by patterning the metal layer.

Next, the lens 18 is formed at a position facing the opening 151 of the second electrode 15.
As a method of forming the lens 18, for example, a negative photosensitive resist film 20 is formed on the second interlayer insulating film 16 (see FIG. 11A), and the second electrode 15 is used as a mask and exposed from the substrate 11 side (FIG. 11A). (See 11B), the lens 18 may be formed at a position facing the opening 151 by developing (see FIG. 11C). The exposure light L is irradiated to the negative photosensitive resist film 20 through the opening 151 of the second electrode 15, but a diffraction phenomenon of the exposure light may occur in the vicinity of the edge of the opening 151. As a result, the exposure amount distribution is formed on the negative type photosensitive resist film 20 that is irradiated with the exposure light L through the opening 151, so that the lens 18 can be formed at a position facing the opening 151.

As another method for forming the lens 18, for example, a negative photosensitive resist film 20 is formed on the second interlayer insulating film 16 (see FIG. 11A), and the light-shielding portion 31, the semi-transmissive portion 32, and the translucent portion 33 are formed. The lens 18 may be formed at a position facing the opening 151 by exposing through a multi-gradation exposure mask 30 having at least (see FIG. 12A) and developing the lens 18 (see FIG. 12B).

As another method for forming the lens 18, for example, a resin such as a material (for example, a photosensitive (ultraviolet curable) resist material) constituting the lens 18 is located at a position facing the opening 151 on the second interlayer insulating film 16. A lens 18 may be formed by dropping a droplet 40 of a material or the like by an inkjet method (see FIG. 13A) and irradiating the droplet 40 of the material with, for example, ultraviolet UV or the like to cure it (FIG. 13B). reference). Further, a material 50 (for example, a resin material such as a photosensitive (ultraviolet curable) resist material) constituting the lens 18 is applied to a position of the second interlayer insulating film 16 facing the opening 151, and the lens 18 is formed. After molding using a plate 60 (a transparent plate or the like made of quartz glass or the like) having a recess 61 corresponding to the above, and exposing through the plate 60 to cure the material 50 (see FIG. 14A). The lens 18 may be formed by removing the mold (see FIG. 14B).

By forming the lens 18 at a position corresponding to the opening 151 of the second electrode 15 as described above, the organic EL display device 10 according to the present embodiment can be manufactured. According to the organic EL display device 10 manufactured in this way, the light transmittance in the thickness direction of the organic EL display device 10 can be improved.

The embodiments described above are described for facilitating the understanding of the present disclosure, and are not described for limiting the present disclosure. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present disclosure.

Claims (9)

A substrate having a first surface and a second surface facing the first surface,
A plurality of first electrodes located in a matrix on the first surface of the substrate,
A plurality of organic compound layers each located on the plurality of first electrodes,
A second electrode located on the plurality of organic compound layers having a plurality of openings located between the adjacent organic compound layers in a plan view from the first surface side to the second surface side.
An organic electroluminescence display device including a lens provided at a position facing at least a part of the opening. The organic electroluminescence display device according to claim 1, wherein the lens is provided at a position facing the opening on the side opposite to the substrate with respect to the second electrode. The organic electroluminescence display device according to claim 1, wherein the lens is provided at a position facing the opening on the substrate side with reference to the second electrode. The lens faces the first lens provided at a position facing the opening on the side opposite to the substrate with respect to the second electrode and the opening facing the opening on the substrate side with reference to the second electrode. The organic electroluminescence display device according to claim 1, which includes a second lens provided at a position where the lens is formed. The lens is provided at a position that does not overlap with the first electrode in a plan view from the second electrode side toward the first electrode side or a plan view from the first electrode side toward the second electrode side. The organic electroluminescence display device according to any one of claims 1 to 4. The light emitted in the organic compound layer is taken out from the second electrode side.
In a plan view from the second electrode side to the first electrode side or a plan view from the first electrode side to the second electrode side, the second lens is a part of the organic compound. The organic electroluminescence display device according to claim 4, which is provided at a position overlapping the layers. The organic electroluminescence display device according to any one of claims 1 to 6, wherein the organic compound layer includes an organic light emitting layer. The organic electroluminescence display device according to any one of claims 1 to 7, wherein the lens includes a cylindrical lens. The organic electroluminescence display device according to any one of claims 1 to 7, wherein the lens includes a spherical lens.

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