Display device including a frame-like shape oxide semiconductor layer

An aspect of the disclosure, in a non-display region, an oxide semiconductor layer is provided in a frame-like shape along a peripheral edge of a through hole, a first opening is provided in a first inorganic insulating film so as to surround the through hole in a plan view and expose the oxide semiconductor layer in the non-display region, a common functional layer is provided so as to extend from a display region to the non-display region, a second opening is provided in a frame-like shape so as to surround the through hole in a plan view and expose the oxide semiconductor layer in the common functional layer, and a second inorganic insulating film is in contact with the oxide semiconductor layer via the second opening.

TECHNICAL FIELD

The disclosure relates to a display device and a method for manufacturing the same.

BACKGROUND ART

In recent years, a self-luminous type organic electroluminescence (hereinafter also referred to as EL) display device using an organic EL element has attracted attention as a display device that can replace liquid crystal display devices. For this organic EL display device, there has been proposed a structure in which in order to install an electronic component such as a camera or a fingerprint sensor, for example, a non-display region having an island shape is provided inside a display region in which an image is displayed and a through hole penetrating in the thickness direction is provided in the non-display region.

For example, PTL 1 discloses an electronic device including a display panel in which a module hole penetrating through a front face and a back face of a base substrate is provided in a display region, and an electronic module housed in the module hole.

CITATION LIST

Patent Literature

SUMMARY

Technical Problem

The organic EL element includes, for example, a first electrode, an organic EL layer, and a second electrode, which are layered in this order over a substrate. Here, a common functional layer that constitutes the organic EL layer and the second electrode are formed by a vapor deposition using a vapor deposition mask so as to be common to a plurality of subpixels constituting the display region. Thus, when a non-display region having an island shape is disposed inside the display region, it is technically difficult to shield the non-display region with the vapor deposition mask, and thus the common functional layer and the second electrode are also formed in the non-display region. Then, for example, an optical transmittance of the common functional layer reduces performance of the electronic component, and thus the common functional layer formed in the non-display region needs to be removed. Here, in order to remove the common functional layer formed in the non-display region, for example, it is conceived that a metal layer capable of converting light to heat is provided in the non-display region and the metal layer is irradiated with laser light to sublimate the common functional layer. However, the organic EL layer (functional layer) in the display region may be damaged due to stray light of reflected light of the laser light.

The disclosure has been made in view of the above, and an object of the disclosure is to remove a common functional layer of a non-display region while suppressing damage to a functional layer in a display region.

Solution to Problem

To achieve the object described above, a display device according to the disclosure includes: a resin substrate; a thin film transistor layer provided on the resin substrate and including a first inorganic insulating film; a light-emitting element layer provided on the thin film transistor layer and including a plurality of light-emitting elements arranged corresponding to a plurality of subpixels constituting a display region; and a sealing film provided on the light-emitting element layer to cover the light-emitting elements and including a second inorganic insulating film, a frame region being provided around the display region, a non-display region being provided in an island shape within the display region, a through hole penetrating in a thickness direction of the resin substrate being provided in the non-display region, a first electrode, a functional layer, and a second electrode being sequentially layered on each of the light-emitting elements, and the functional layer including a common functional layer provided in common to the plurality of subpixels, wherein an oxide semiconductor layer is provided in a frame-like shape along a peripheral edge of the through hole in the non-display region, a first opening is provided in the first inorganic insulating film to surround the through hole in a plan view and expose the oxide semiconductor layer in the non-display region, the common functional layer is provided to extend from the display region to the non-display region, a second opening is provided in a frame-like shape to surround the through hole in a plan view and expose the oxide semiconductor layer in the common functional layer, and the second inorganic insulating film is in contact with the oxide semiconductor layer via the second opening.

A method for manufacturing a display device according to the disclosure includes: a thin film transistor layer forming step of forming a thin film transistor layer including a first inorganic insulating film on a resin substrate; a light-emitting element layer forming step of forming a light-emitting element layer on the thin film transistor layer, the light-emitting element layer including a plurality of light-emitting elements arranged corresponding to a plurality of subpixels constituting a display region; and a sealing film forming step of forming a sealing film including a second inorganic insulating film on the light-emitting element layer to cover the light-emitting elements, wherein a frame region is provided around the display region, a non-display region is provided in an island shape inside the display region, a through hole penetrating in a thickness direction of the resin substrate in the non-display region, a first electrode, a functional layer, and a second electrode are sequentially layered on the light-emitting elements, and the functional layer includes a common functional layer provided in common to the plurality of subpixels, the thin film transistor layer forming step includes a semiconductor layer forming step of forming an oxide semiconductor layer in an island shape in the non-display region, and a first opening forming step of forming a first opening to expose the oxide semiconductor layer to the first inorganic insulating film in the non-display region, the light-emitting element layer forming step includes a functional layer forming step of forming the common functional layer to cover the oxide semiconductor layer exposed from the first opening and extend from the display region to the non-display region, and a functional layer removal step of removing the common functional layer of a portion covering the oxide semiconductor layer by irradiating the oxide semiconductor layer with laser light, and forming a second opening in the common functional layer to expose the oxide semiconductor layer, a peripheral end of the second opening being surrounded by a peripheral end of the first opening in a plan view, in the sealing film forming step, the second inorganic insulating film is formed to cover the oxide semiconductor layer exposed from the second opening, and the method includes, after the sealing film forming step, a through hole forming step of forming the through hole in the non-display region to be surrounded by the peripheral end of the second opening in a plan view.

Advantageous Effects of Disclosure

According to the disclosure, in the non-display region, the oxide semiconductor layer is provided in a frame-like shape along the peripheral edge of the through hole, and in the first inorganic insulating film, the first opening is provided in the non-display region so as to surround the through hole in a plan view and expose the oxide semiconductor layer, so that it is possible to remove the common functional layer in the non-display region while suppressing damage to the functional layer of the display region.

DESCRIPTION OF EMBODIMENTS

Embodiments of the disclosure will be described below in detail with reference to the drawings. Note that the disclosure is not limited to each embodiment to be described below.

First Embodiment

FIG.1toFIG.12illustrate a first embodiment of a display device and a method for manufacturing the same according to the disclosure. Note that, in each of the following embodiments, an organic EL display device including an organic EL element will be exemplified as a display device including a light-emitting element. Here,FIG.1is a plan view illustrating a schematic configuration of an organic EL display device50aaccording to the present embodiment. Further,FIG.2is a plan view of a display region D of the organic EL display device50a.FIG.3is a cross-sectional view of the organic EL display device50ataken along a line III-III inFIG.1.FIG.4is an equivalent circuit diagram of a thin film transistor layer20constituting the organic EL display device50a. Further,FIG.5is a cross-sectional view of an organic EL layer23constituting the organic EL display device50a.FIG.6andFIG.7are cross-sectional views of a frame region F of the organic EL display device50ataken along a line VI-VI and line VII-VII, respectively, inFIG.1. Further,FIG.8is a plan view of a non-display region N and a periphery of the non-display region N of the organic EL display device50a. Further,FIG.9is a cross-sectional view of the non-display region N of the organic EL display device50ataken along a line IX-IX inFIG.8.

As illustrated inFIG.1, the organic EL display device50aincludes, for example, the display region D provided in a rectangular shape and configured to display an image, and the frame region F provided in a frame shape surrounding the display region D. Note that in the present embodiment, the display region D having the rectangular shape has been exemplified, but examples of the rectangular shape include a substantially rectangular shape such as a shape whose sides are arc-shaped, a shape whose corners are arc-shaped, a shape in which a part of a side has a notch and the like.

As illustrated inFIG.2, a plurality of subpixels P are arranged in a matrix shape in the display region D. In addition, in the display region D, for example, a subpixel P including a red light-emitting region Er configured to display a red color, a subpixel P including a green light-emitting region Eg configured to display a green color, and a subpixel P including a blue light-emitting region Eb configured to display a blue color are provided adjacent to one another, as illustrated inFIG.2. Note that one pixel is configured by, for example, the three adjacent subpixels P including the red light-emitting region Er, the green light-emitting region Eg, and the blue light-emitting region Eb in the display region D. Further, as illustrated inFIG.1, the non-display region N is provided in an island shape in the display region D. Here, as illustrated inFIG.1, in order to dispose a camera45, a through hole H penetrating in the thickness direction of a resin substrate layer10, which will be described below, is provided in the non-display region N. Note that a detailed structure and the like of the non-display region N will be described below with reference toFIG.8andFIG.9.

A terminal portion T is provided in an end portion of the frame region F on the right side inFIG.1in such a manner as to extend in one direction (a vertical direction in the drawing). Additionally, as illustrated inFIG.1, in the frame region F, a bending portion B bendable, for example, by 180 degrees (in a U-shape) about a bending axis that is the vertical direction in the drawing is provided on the display region D side of the terminal portion T in such a manner as to extend in one direction (the vertical direction in the drawing). Here, as illustrated inFIG.1,FIG.3, andFIG.6, in the frame region F, a trench G having a substantially C shape is provided in a flattening film19a, which will be described below, in such a manner as to penetrate the flattening film19a. Note that as illustrated inFIG.1, the trench G is provided in a substantially C shape in such a manner as to open on the terminal portion T side in a plan view.

As illustrated inFIG.3,FIG.6,FIG.7, andFIG.9, the organic EL display device50aincludes a resin substrate layer10provided as a resin substrate, a thin film transistor (hereinafter also referred to as TFT) layer20provided on the resin substrate layer10, an organic EL element layer30provided on the TFT layer20, and a sealing film40provided on the organic EL element layer30.

The resin substrate layer10is formed, for example, of a polyimide resin or the like.

As illustrated inFIG.3,FIG.6,FIG.7, andFIG.9, the TFT layer20includes a gate insulating film13, a first interlayer insulating film15, and a second interlayer insulating film17sequentially provided as first inorganic insulating films on the resin substrate layer10, and the flattening film19aprovided on the second interlayer insulating film17. Specifically, as illustrated inFIG.3, the TFT layer20includes a base coat film11provided on the resin substrate layer10side, a plurality of first TFTs9a, a plurality of second TFTs9b, and a plurality of capacitors9cprovided on the base coat film11, and the flattening film19aprovided on the first TFTs9a, the second TFTs9b, and the capacitors9c. Here, in the TFT layer20, as illustrated inFIG.2andFIG.4, a plurality of gate lines14are provided so as to extend parallel to each other in the lateral direction in the drawings. Further, in the TFT layer20, as illustrated inFIG.2andFIG.4, a plurality of source lines18fare provided so as to extend parallel to each other in the vertical direction in the drawings. Further, in the TFT layer20, as illustrated inFIG.2andFIG.4, a plurality of power source lines18gare provided so as to extend parallel to each other in the vertical direction in the drawings. Then, as illustrated inFIG.2, each of the power source lines18gis provided to be adjacent to each of the source lines18f. Further, in the TFT layer20, as illustrated inFIG.4, each of the subpixels P includes the first TFT9a, the second TFT9b, and the capacitor9c.

The base coat film11, the gate insulating film13, the first interlayer insulating film15, and the second interlayer insulating film17are each constituted of a single-layer film or a layered film of an inorganic insulating film of, for example, silicon nitride, silicon oxide, or silicon oxynitride.

The first TFT9ais electrically connected to the corresponding gate line14and source line18fin each of the subpixels P, as illustrated inFIG.4. Additionally, as illustrated inFIG.3, the first TFT9aincludes a semiconductor layer12a, a gate insulating film13, a gate electrode14a, the first interlayer insulating film15, the second interlayer insulating film17, and a source electrode18aand a drain electrode18b, which are sequentially provided on the base coat film11. Here, the semiconductor layer12aincludes, for example, an In—Ga—Zn—O-based semiconductor such as InGaZnO4, is provided in an island shape on the base coat film11as illustrated inFIG.3, and includes a channel region, a source region, and a drain region. Additionally, as illustrated inFIG.3, the gate insulating film13is provided so as to cover the semiconductor layer12a. Additionally, as illustrated inFIG.3, the gate electrode14ais provided on the gate insulating film13, and overlaps with the channel region of the semiconductor layer12a. Additionally, as illustrated inFIG.3, the first interlayer insulating film15and the second interlayer insulating film17are sequentially provided so as to cover the gate electrode14a. Additionally, as illustrated inFIG.3, the source electrode18aand the drain electrode18bare provided being separated from each other on the second interlayer insulating film17. Additionally, as illustrated inFIG.3, the source electrode18aand the drain electrode18bare electrically connected to the source region and the drain region of the semiconductor layer12a, respectively, via each contact hole formed in a layered film including the gate insulating film13, the first interlayer insulating film15, and the second interlayer insulating film17. Note that, in the present embodiment, as a transparent amorphous oxide semiconductor (TaOS) constituting the semiconductor layer12a, an In—Ga—Zn—O-based semiconductor has been exemplified, but another semiconductor such as In—Sn—Zn—O-based, In—Al—Zn—O-based, In—Al—Sn—Zn—O-based, Zn—O-based, In—Zn—O-based, Zn—Ti—O-based, Cd—Ge—O-based, Cd—Pb—O-based, Cd—Zn—O-based, Cd—O-based, Mg—Zn—O-based, In—Ga—Sn—O-based, In—Ga—O-based, Zr—In—Zn—O-based, Hf—In—Zn—O-based, Al—Ga—Zn—O-based, Ga—Zn—O-based, or In—Ga—Zn—O-based semiconductor may be included. Specific examples of the In—Sn—Zn—O-based semiconductor include In2O3—SnO2—ZnO and the like. In addition, examples of the In—Ga—Zn—O-based semiconductor include InGaO3(ZnO)5and the like. As the Zn—O-based semiconductor, a semiconductor of ZnO in an amorphous state, a polycrystalline state, or a microcrystalline state in which the amorphous state and the polycrystalline state are mixed, the ZnO to which an impurity element of at least one kind selected from Group 1 elements, Group 13 elements, Group 14 elements, Group 15 elements, Group 17 elements, and the like is added or no impurity is added, can be used.

The second TFT9bis electrically connected to the corresponding first TFT9aand power source line18gin each of the subpixels P, as illustrated inFIG.4. As illustrated inFIG.3, the second TFT9bincludes a semiconductor layer12b, the gate insulating film13, a gate electrode14b, the first interlayer insulating film15, the second interlayer insulating film17, and a source electrode18cand a drain electrode18d, which are sequentially provided on the base coat film11. Here, the semiconductor layer12bincludes, for example, an In—Ga—Zn—O-based semiconductor such as InGaZnO4, as illustrated inFIG.3, is provided in an island shape on the base coat film11, and includes a channel region, a source region, and a drain region. Additionally, as illustrated inFIG.3, the gate insulating film13is provided so as to cover the semiconductor layer12b. Additionally, as illustrated inFIG.3, the gate electrode14bis provided on the gate insulating film13, and overlaps with the channel region of the semiconductor layer12b. Additionally, as illustrated inFIG.3, the first interlayer insulating film15and the second interlayer insulating film17are sequentially provided so as to cover the gate electrode14b. Additionally, as illustrated inFIG.3, the source electrode18cand the drain electrode18dare provided being separated from each other on the second interlayer insulating film17. Additionally, as illustrated inFIG.3, the source electrode18cand the drain electrode18dare electrically connected to the source region and the drain region of the semiconductor layer12b, respectively, via each contact hole formed in a layered film including the gate insulating film13, the first interlayer insulating film15, and the second interlayer insulating film17.

Note that in the present embodiment, the first TFT9aand the second TFT9bare exemplified as being of a top-gate type, but the first TFT9aand the second TFT9bmay be a bottom-gate type TFT.

The capacitor9cis electrically connected to the corresponding first TFT9aand power source line18gin each of the subpixels P, as illustrated inFIG.4. Here, as illustrated inFIG.3, the capacitor9cincludes a lower conductive layer14cformed of the same material as and in the same layer as those of the gate electrodes14aand14b, the first interlayer insulating film15provided so as to cover the lower conductive layer14c, and an upper conductive layer16provided on the first interlayer insulating film15so as to overlap with the lower conductive layer14c. Note that, as illustrated inFIG.3, the upper conductive layer16is electrically connected to the power source line18gvia a contact hole formed in the second interlayer insulating film17.

The flattening film19ais formed of, for example, a positive-working photosensitive resin such as a polyimide resin.

As illustrated inFIG.3, the organic EL element layer30includes a plurality of organic EL elements25arranged in a matrix shape on the flattening film19a. Here, the plurality of organic EL elements25are provided as a plurality of light-emitting elements arranged corresponding to the plurality of subpixels P.

As illustrated inFIG.3, the organic EL element25includes a first electrode21a, an organic EL layer23, and a second electrode24sequentially layered on the TFT layer20. Specifically, as illustrated inFIG.3, the organic EL element25includes the first electrode21aprovided on the flattening film19aof the TFT layer20, the organic EL layer23provided on the first electrode21aas a functional layer, and the second electrode24provided on the organic EL layer23to be common to the plurality of subpixels P.

As illustrated inFIG.3, the first electrode21ais electrically connected to the drain electrode18dof the second TFT9bof each of the subpixels P via a contact hole formed in the flattening film19a. The first electrode21afunctions to inject holes (positive holes) into the organic EL layer23. The first electrode21ais preferably formed of a material having a large work function to improve the hole injection efficiency into the organic EL layer23. Examples of materials constituting the first electrode21ainclude metallic materials such as silver (Ag), aluminum (Al), vanadium (V), cobalt (Co), nickel (Ni), tungsten (W), gold (Au), titanium (Ti), ruthenium (Ru), manganese (Mn), indium (In), ytterbium (Yb), lithium fluoride (LiF), platinum (Pt), palladium (Pd), molybdenum (Mo), iridium (Ir), and tin (Sn). Examples of materials constituting the first electrode21amay include an alloy with astatine (At)/astatine oxide (AtO2). Examples of materials constituting the first electrode21amay include electrically conductive oxides such as tin oxide (SnO), zinc oxide (ZnO), indium tin oxide (ITO), and indium zinc oxide (IZO). The first electrode21amay be formed by layering a plurality of layers formed of any of the materials described above. Note that, examples of compound materials having a large work function include indium tin oxide (ITO) and indium zinc oxide (IZO). Furthermore, a peripheral end portion of the first electrode21ais covered by an edge cover22aprovided in a lattice pattern common to the plurality of subpixels P. Examples of materials constituting the edge cover22ainclude a positive-working photosensitive resin such as polyimide resin, acrylic resin, polysiloxane resin, and novolak resin. Further, as illustrated inFIG.3, a part of a surface of the edge cover22aprojects upward in the drawing and becomes pixel photospacers22peach provided in an island shape as first photospacers.

The organic EL layer23includes a hole injection layer1, a hole transport layer2, a light-emitting layer3, an electron transport layer4, and an electron injection layer5, which are sequentially provided on the first electrode21a, as illustrated inFIG.5.

The hole injection layer1is also referred to as an anode buffer layer, functions to reduce an energy level difference between the first electrode21aand the organic EL layer23to thereby improve the hole injection efficiency from the first electrode21ato the organic EL layer23, and is provided as a common functional layer of an organic vapor deposition layer common to the plurality of subpixels P. Here, examples of materials constituting the hole injection layer1include triazole derivatives, oxadiazole derivatives, imidazole derivatives, polyarylalkane derivatives, pyrazoline derivatives, phenylenediamine derivatives, oxazole derivatives, styrylanthracene derivatives, fluorenone derivatives, hydrazone derivatives, stilbene derivatives and the like. Note that the common functional layer is a functional layer formed using a common metal mask (CMM). This CMM is a mask in which one opening is provided corresponding to one display device, and thus cannot include a pattern that shields the non-display region N having an island shape. Accordingly, the common functional layer is also deposited on the non-display region N. In contrast, an individual functional layer is a functional layer formed using a fine metal mask (FMM). This FMM is a mask in which an opening is provided for each color (e.g., including a functional layer common in red and green). Furthermore, in addition to the hole injection layer1described above, the functional layer includes the hole transport layer2, the light-emitting layer3, the electron transport layer4, the electron injection layer5, and the like.

The electron transport layer4functions to facilitate migration of electrons to the light-emitting layer3efficiently, and is provided as a common functional layer of an inorganic vapor deposition layer common to the plurality of subpixels P. Here, examples of materials constituting the electron transport layer4include oxadiazole derivatives, triazole derivatives, benzoquinone derivatives, naphthoquinone derivatives, anthraquinone derivatives, tetracyanoanthraquinodimethane derivatives, diphenoquinone derivatives, fluorenone derivatives, silole derivatives, metal oxinoid compounds and the like, as organic compounds.

The electron injection layer5functions to reduce an energy level difference between the second electrode24and the organic EL layer23to thereby improve the efficiency of electron injection into the organic EL layer23from the second electrode24, and the electron injection layer5can lower the drive voltage of the organic EL element25by this function. Note that the electron injection layer5is also referred to as a cathode buffer layer, and is provided as a common functional layer of an inorganic vapor deposition layer common to the plurality of subpixels P. Here, examples of materials constituting the electron injection layer5include inorganic alkaline compounds, such as lithium fluoride (LiF), magnesium fluoride (MgF2), calcium fluoride (CaF2), strontium fluoride (SrF2), barium fluoride (BaF2) and the like, aluminum oxide (Al2O3), strontium oxide (SrO) and the like.

Note that the common functional layers described above are exemplary, and any of the layers may be an individual functional layer. For example, in a case where the display device is configured by performing color conversion using a quantum-dot light emitting diode (QLED) or the like from a light-emitting layer emitting ultraviolet light or blue light, the light-emitting layer3may be provided as a common functional layer.

As illustrated inFIG.3, the second electrode24is provided so as to cover the organic EL layers23and the edge cover22ato be common to the plurality of subpixels P. In addition, the second electrode24functions to inject electrons into the organic EL layer23. In addition, the second electrode24is preferably formed of a material having a low work function to improve the efficiency of electron injection into the organic EL layer23. Here, examples of materials that may be included in the second electrode24include silver (Ag), aluminum (Al), vanadium (V), cobalt (Co), nickel (Ni), tungsten (W), gold (Au), calcium (Ca), titanium (Ti), yttrium (Y), sodium (Na), ruthenium (Ru), manganese (Mn), indium (In), magnesium (Mg), lithium (Li), ytterbium (Yb), and lithium fluoride (LiF). The second electrode24may be formed of alloys of magnesium (Mg)/copper (Cu), magnesium (Mg)/silver (Ag), sodium (Na)/potassium (K), astatine (At)/astatine oxide (AtO2), lithium (Li)/aluminum (Al), lithium (Li)/calcium (Ca)/aluminum (Al), and lithium fluoride (LiF)/calcium (Ca)/aluminum (Al), for example. In addition, the second electrode24may be formed of electrically conductive oxide, for example, tin oxide (SnO), zinc oxide (ZnO), indium tin oxide (ITO), indium zinc oxide (IZO), or the like. In addition, the second electrode24may be formed by layering a plurality of layers formed of any of the materials described above. Note that, examples of materials having a small work function include magnesium (Mg), lithium (Li), lithium fluoride (LiF), magnesium (Mg)/copper (Cu), magnesium (Mg)/silver (Ag), sodium (Na)/potassium (K), lithium (Li)/aluminum (Al), lithium (Li)/calcium (Ca)/aluminum (Al), lithium fluoride (LiF)/calcium (Ca)/aluminum (Al) and the like.

As illustrated inFIG.3,FIG.6, andFIG.9, the sealing film40is provided so as to cover the organic EL elements25, and functions to protect the organic EL layer23of each of the organic EL elements25from moisture, oxygen, and the like. Specifically, as illustrated inFIG.3,FIG.6, andFIG.9, the sealing film40includes a lower second inorganic insulating film36provided on the resin substrate layer10side so as to cover the second electrode24, an upper second inorganic insulating film38provided on the side opposite to the resin substrate layer10, and an organic insulating film37provided between the lower second inorganic insulating film36and the upper second inorganic insulating film38. Here, the lower second inorganic insulating film36and the upper second inorganic insulating film38are each formed of, for example, an inorganic material such as silicon oxide (SiO2), aluminum oxide (Al2O3), silicon nitride (SiNx (x is a positive number)) such as trisilicon tetranitride (Si3N4), or silicon carbonitride (SiCN). On the other hand, the organic insulating film37is formed of, for example, an organic material such as acrylic resin, polyurea resin, parylene resin, polyimide resin, or polyamide resin.

Additionally, as illustrated inFIG.1andFIG.6, the organic EL display device50aincludes, in the frame region F, a first external dam wall Wa provided in a frame-like shape so as to surround the display region D and overlap with an outer peripheral end portion of the organic insulating film37, and a second external dam wall Wb provided in a frame-like shape so as to surround the first external dam wall Wa.

As illustrated inFIG.6, the first external dam wall Wa includes a first resin layer19bformed of the same material as and in the same layer as those of the flattening film19a, and a second resin layer22cthat is provided on the first resin layer19bvia the first conductive layer21band is formed of the same material as and in the same layer as those of the edge cover22a. Here, as illustrated inFIG.6, the first conductive layer21bis provided in a substantially C shape in such a manner as to overlap with the trench G, the first external dam wall Wa, and the second external dam wall Wb in the frame region F. Note that the first conductive layer21bis formed of the same material as and in the same layer as those of the first electrode21a.

As illustrated inFIG.6, the second external dam wall Wb includes a first resin layer19cformed of the same material as and in the same layer as those of the flattening film19a, and a second resin layer22dthat is provided on the first resin layer19cvia the first conductive layer21band is formed of the same material as and in the same layer as those of the edge cover22a.

As illustrated inFIG.3, andFIG.6, the organic EL display device50aincludes a first frame wiring line18hprovided outside of the trench G in such a manner as to surround the display region D and overlap with the first external dam wall Wa and the second external dam wall Wb, in the frame region F. Here, the first frame wiring line18his electrically connected to a power supply terminal to which a low power supply voltage (ELVSS) is input at the terminal portion T. Further, as illustrated inFIG.6, the first frame wiring line18his electrically connected to the second electrode24via the first conductive layer21b.

In addition, as illustrated inFIG.3, the organic EL display device50aincludes a second frame wiring line18iprovided inside of the trench G in the frame region F. Here, the second frame wiring line18iis electrically connected to a power supply terminal to which a high power supply voltage (ELVDD) is input at the terminal portion T. The second frame wiring line18iis electrically connected, on the display region D side, to the plurality of power source lines18gdisposed in the display region D.

Furthermore, as illustrated inFIG.7, the organic EL display device50aincludes: a lower layer flattening film8aprovided to be filled in a slit S formed in the base coat film11, the gate insulating film13, the first interlayer insulating film15, and the second interlayer insulating film17; a plurality of lead wiring lines18jprovided on the lower layer flattening film8aand the second interlayer insulating film17; and a wiring line covering layer19dprovided so as to cover the plurality of lead wiring lines18j, in the bending portion B.

As illustrated inFIG.7, the slit S is provided to be formed in a groove shape that penetrates the base coat film11, the gate insulating film13, the first interlayer insulating film15, and the second interlayer insulating film17, and proceeds along a direction in which the bending portion B extends so as to expose the surface of the resin substrate layer10.

The lower layer flattening film8ais formed of, for example, an organic resin material such as a polyimide resin.

The plurality of lead wiring lines18jare provided so as to extend parallel to each other in a direction orthogonal to the direction in which the bending portion B extends. Here, as illustrated inFIG.7, both end portions of each of the lead wiring lines18jare electrically connected to a first gate conductive layer14cand a second gate conductive layer14d, respectively, via respective contact holes formed in layered films of the first interlayer insulating film15and the second interlayer insulating film17. Note that the lead wiring lines18jare each formed of the same material as and in the same layer as those of the source line18fand the power source line18g. Further, as illustrated inFIG.7, the first gate conductive layer14cis provided between the gate insulating film13and the first interlayer insulating film15, and is electrically connected to signal wiring lines (the gate line14, the source line18f, and the like) extending in the display region D. Further, as illustrated inFIG.7, the second gate conductive layer14dis provided between the gate insulating film13and the first interlayer insulating film15, and is electrically connected to a signal terminal of the terminal portion T. Further, the wiring line covering layer19dis formed of the same material as and in the same layer as those of the flattening film19a.

As illustrated inFIG.3andFIG.6, the organic EL display device50aincludes a plurality of frame photospacers22beach provided in an island shape as second photospacers in such a manner as to project upward in the drawing, on the flattening film19ain the frame region F. Here, the frame photospacers22bare each formed of the same material as and in the same layer as those of the edge cover22a. The frame photospacers22beach may be formed by layering a resin layer formed of the same material as and in the same layer as those of the edge cover22a, and another layer.

As illustrated inFIG.8andFIG.9, the organic EL display device50aincludes a first internal dam wall We and a second internal dam wall Wd each provided in a circular frame shape from the display region D side so as to surround an oxide semiconductor layer12c, which will be described below, in a plan view, in the non-display region N.

As illustrated inFIG.9, the first internal dam wall We includes a first resin layer19eformed of the same material as and in the same layer as those of the flattening film19a, and a second resin layer22ethat is provided on the first resin layer19eand is formed of the same material as and in the same layer as those of the edge cover22a. Here, as illustrated inFIG.9, the first internal dam wall We is provided on the display region D side of the non-display region N so as to overlap with an inner peripheral end portion of the organic insulating film37constituting the sealing film40.

As illustrated inFIG.9, the second internal dam wall Wb includes a first resin layer19fformed of the same material as and in the same layer as those of the flattening film19a, and a second resin layer22fthat is provided on the first resin layer19fand is formed of the same material as and in the same layer as those of the edge cover22a.

Further, as illustrated inFIG.9, the organic EL display device50aincludes a plurality of non-display photospacers22ceach provided in an island shape as third photospacers so as to project upward in the drawing, on the flattening film19aon the display region D side of the first internal dam wall Wc in the non-display region N. Here, the non-display photospacers22care each formed of the same material as and in the same layer as those of the edge cover22a. The non-display photospacers22ceach may be formed by layering a resin layer formed of the same material as and in the same layer as those of the edge cover22a, and another layer.

As illustrated inFIG.8andFIG.9, the organic EL display device50aincludes the oxide semiconductor layer12c(see the dotted portion inFIG.8) provided in a circular frame-shaped island shape along the peripheral edge of the through hole H, that is, along the boundary with the display region D, in the non-display region N. Here, as illustrated inFIG.9, the oxide semiconductor layer12cis provided on the base coat film11, and is formed of the same material as and in the same layer as those of the semiconductor layers12aand12b. Furthermore, as illustrated inFIG.9, the peripheral end portion of the oxide semiconductor layer12con the through hole H side has a side surface flush with the side surface of the through hole H and is provided along the peripheral edge of the through hole H. In addition, as illustrated inFIG.9, the peripheral end portion of the oxide semiconductor layer12con the second internal dam wall Wd side is covered by the gate insulating film13. Furthermore, as illustrated inFIG.8andFIG.9, in the gate insulating film13, the first interlayer insulating film15, and the second interlayer insulating film17, a first opening Ma is provided in the non-display region N so as to surround the through hole H in a plan view and expose the oxide semiconductor layer12c. Note that as illustrated inFIG.9, the peripheral portion of the first opening Ma is provided so as to cover the outer peripheral end portion of the oxide semiconductor layer12cand is configured to function as an etching stopper when the oxide semiconductor layer12cforms the first opening Ma. Furthermore, as illustrated inFIG.9, the second electrode24is provided so as to extend from the display region D to the non-display region N. In addition, as illustrated inFIG.8andFIG.9, a third opening Mc is provided in the second electrode24in a frame-like shape so as to surround the through hole H in a plan view and expose the oxide semiconductor layer12c. Note that, although the hole injection layer1, the hole transport layer2, the electron transport layer4, and the electron injection layer5are not illustrated inFIG.9, the common functional layer including the hole injection layer1, the hole transport layer2, the electron transport layer4, and the electron injection layer5is provided so as to extend from the display region D to the non-display region N as with the second electrode24, and a second opening Mb is provided in a frame-like shape in the common functional layer so as to surround the through hole H in a plan view and expose the oxide semiconductor layer12c. Furthermore, as illustrated inFIG.8andFIG.9, the peripheral ends of the second opening Mb and the third opening Mc coincide with each other, and the oxide semiconductor layer12cand the lower second inorganic insulating film36of the sealing film40are in contact with each other via the second opening Mb and the third opening Mc, as illustrated inFIG.9.

In addition, as illustrated inFIG.8andFIG.9, in the organic EL display device50a, a fourth opening Md is provided in the lower second inorganic insulating film36and the upper second inorganic insulating film38that constitute the sealing film40so as to surround the through hole H, in the non-display region N. Here, as illustrated inFIG.9, the second electrode24is exposed through the fourth opening Md, in the periphery of the through hole H.

As illustrated inFIG.1andFIG.8, the organic EL display device50aincludes a camera45installed as an electronic component inside the through hole H in the non-display region N. Here, the camera45is composed of a charge coupled device (CCD), a complementary metal oxide semiconductor (CMOS) image sensor, or the like, and is mounted inside a housing accommodating the organic EL display device50a. Note that in the present embodiment, the camera45is exemplified as an electronic component, but the electronic component may be a fingerprint sensor or the like.

In the organic EL display device50adescribed above, in each subpixel P, a gate signal is input to the first TFT9avia the gate line14to turn on the first TFT9a, a data signal is written in the gate electrode14bof the second TFT9band the capacitor9cvia the source line18f, and a current from the power source line18gcorresponding to the gate voltage of the second TFT9bis supplied to the organic EL layer23, whereby the light-emitting layer3of the organic EL layer23emits light to display an image. Note that in the organic EL display device50a, even when the first TFT9ais turned off, the gate voltage of the second TFT9bis held by the capacitor9c. Thus, the light emission by the light-emitting layer3is maintained until the gate signal of the next frame is input.

Next, a method for manufacturing the organic EL display device50aaccording to the present embodiment will be described. Note that the method for manufacturing the organic EL display device50aaccording to the present embodiment includes a TFT layer forming step, an organic EL element layer forming step, a sealing film forming step, a flexing step, and a component mounting step. Note thatFIG.10is a cross-sectional view illustrating a functional layer removal step of an organic EL element layer forming step in the method for manufacturing the organic EL display device50a.

TFT Layer Forming Step

For example, by using a known method, the TFT layer20is formed by forming the base coat film11, the first TFT9a, the second TFT9b, the capacitor9c, and the flattening film19aon a surface of the resin substrate layer10formed on a glass substrate.

Here, when the semiconductor layer12aof the first TFT9aand the semiconductor layer12bof the second TFT9bare formed, the oxide semiconductor layer12cis formed in an island shape in the non-display region N (semiconductor layer forming step). Furthermore, when a contact hole is formed in the step of forming the first TFT9aand the second TFT9b, the first opening Ma is formed in the gate insulating film13, the first interlayer insulating film15, and the second interlayer insulating film17so as to expose the oxide semiconductor layer12c, in the non-display region N (first opening forming step).

Organic EL Element Layer Forming Step (Light-emitting Element Layer Forming Step) First, on the flattening film19aof the TFT layer20, which is formed in the TFT layer forming step described above, the first electrode21aand the edge cover22aare formed by using a known method.

Subsequently, the hole injection layer1, the hole transport layer2, the light-emitting layer3, the electron transport layer4, and the electron injection layer5are sequentially formed on the first electrode21aexposed from the edge cover22aby, for example, a vacuum vapor deposition technique to form the organic EL layer23(functional layer forming step). Note that when the hole injection layer1, the hole transport layer2, the electron transport layer4, and the electron injection layer5are formed, the CMM is used as the vapor deposition mask, and when the light-emitting layer3is formed, the FMM is used as the vapor deposition mask.

Thereafter, the second electrode24is formed using the CMM by, for example, the vacuum vapor deposition technique so as to cover the organic EL layer23and extend from the display region D to the non-display region N.

Furthermore, as illustrated inFIG.10, the oxide semiconductor layer12cis scanned in an annular shape in a plan view while being irradiated with laser light L having a wavelength of the ultraviolet range (for example, about 300 nm to 400 nm) to remove the hole injection layer1, the hole transport layer2, the electron transport layer4, the electron injection layer5, and the second electrode24in a portion covering the oxide semiconductor layer12c, whereby the second opening Mb is formed in the hole injection layer1, the hole transport layer2, the electron transport layer4, and the electron injection layer5in such a manner that the peripheral end of the second opening Mb is surrounded by the first opening Ma in a plan view and the oxide semiconductor layer12cis exposed, and the third opening Mc is formed in the second electrode24(functional layer removal step). Here, in the functional layer removal step, energy of the laser light L is converted to heat by irradiating the oxide semiconductor layer12cwith the laser light L, and at least the hole injection layer1of the lowest layer is sublimated and removed. With the sublimation of at least the hole injection layer1of the lowest layer, the upper layer thereof is detached from the oxide semiconductor layer12cand removed. At least one layer of the hole transport layer2, the electron transport layer4, and the electron injection layer5above the hole injection layer1may also be sublimated and removed. Furthermore, the second electrode24is detached and removed with sublimation of the lower layer thereof.

As described above, the organic EL element25is formed to form the organic EL element layer30.

Sealing Film Forming Step

First, on a surface of the substrate on which the organic EL element layer30formed in the organic EL element layer forming step described above is formed, the lower second inorganic insulating film36is formed using a mask by, for example, forming an inorganic insulating film such as a silicon nitride film, a silicon oxide film, or a silicon oxynitride film, by a plasma chemical vapor deposition (CVD) method. Thus, the lower second inorganic insulating film36can be formed in the non-display region N so as to cover the oxide semiconductor layer12cexposed from the second opening Mb and the third opening Mc.

Subsequently, on a surface of the substrate on which the lower second inorganic insulating film36is formed, an organic resin material such as an acrylic resin is film-formed by using, for example, an ink-jet method to form the organic insulating film37.

Thereafter, on the substrate on which the organic insulating film37is formed, the upper second inorganic insulating film38is formed using a mask by, for example, forming an inorganic insulating film such as a silicon nitride film, a silicon oxide film, and a silicon oxynitride film, by the plasma CVD method.

Furthermore, after a resist pattern is formed on the upper second inorganic insulating film38, the upper second inorganic insulating film38and the lower second inorganic insulating film36exposed from the resist pattern are removed by dry etching in the non-display region N to form the fourth opening Md, thereby forming the sealing film40.

Flexing Step

First, after a protective sheet (not illustrated) is bonded to a surface of the substrate on which the sealing film40is formed in the sealing film forming step, by irradiation with laser light from the glass substrate side of the resin substrate layer10, the glass substrate is peeled off from a lower surface of the resin substrate layer10, and subsequently, a protective sheet (not illustrated) is bonded to the lower surface of the resin substrate layer10from which the glass substrate has been peeled off.

Furthermore, the second electrode24, the oxide semiconductor layer12c, the base coat film11, and the resin substrate layer10exposed from the fourth opening Md are irradiated with laser light while being scanned in an annular shape by, for example, using a yttrium aluminum garnet (YAG) laser to form the through hole H so as to be surrounded by the peripheral end of the fourth opening Md (through hole forming step).

Component Mounting Step

The camera45is mounted in, for example, a housing accommodating the device body so as to be installed inside the through hole H formed in the aforementioned flexing step.

The organic EL display device50aof the present embodiment can be manufactured in this manner.

Note that in the present embodiment, the organic EL display device50ain which the second electrode24is provided to be exposed from the sealing film40in the periphery of the through hole His exemplified. However, the disclosure may be embodied by organic EL display devices50band50cin which the resin substrate layer10and the oxide semiconductor layer12care provided so as to be exposed from the sealing film40in the periphery of the through hole H.

The organic EL display device50band the organic EL display device50cwill be described below.

First Modified Example

FIG.11is a cross-sectional view of a non-display region N of the organic EL display device50bof a first modified example, and is a view corresponding toFIG.9. Note that, in the following modified examples, portions identical to those inFIG.1toFIG.10are denoted by the same reference signs, and their detailed descriptions are omitted.

In the organic EL display device50b, in the periphery of the through hole H of the non-display region N, the second electrode24, the oxide semiconductor layer12c, and the base coat film11(seeFIG.9) exposed from the fourth opening Md formed in the sealing film40of the present embodiment are further removed, and thus the upper surface of the resin substrate layer10is provided so as to be exposed from the fourth opening Md, as illustrated inFIG.11. Note that the configuration of the display region D and the frame region F of the organic EL display device50bis substantially the same as the configuration of the display region D and the frame region F of the organic EL display device50aof the present embodiment.

According to the organic EL display device50bhaving the configuration described above, the second electrode24, the oxide semiconductor layer12c, and the base coat film11are not disposed in the portion that is irradiated with the laser light L when forming the through hole H. Thus, when the through hole H is formed, generation of cracks can be suppressed in the second electrode24, the oxide semiconductor layer12c, and the base coat film11.

Second Modified Example

FIG.12is a cross-sectional view of a non-display region N of the organic EL display device50caccording to a second modified example, and is a view corresponding toFIG.9.

In the organic EL display device50c, as illustrated inFIG.12, the second opening Mb formed in the hole injection layer1, the hole transport layer2, the electron transport layer4, and the electron injection layer5, and the third opening Mc formed in the second electrode24are provided so as to extend to the peripheral edge of the through hole H. Note that the configuration of the display region D and the frame region F of the organic EL display device50cis substantially the same as the configuration of the display region D and the frame region F of the organic EL display device50aof the present embodiment.

The organic EL display device50chaving the configuration described above can be manufactured by scanning the oxide semiconductor layer12cin a circular shape rather than an annular shape in a plan view while irradiating the oxide semiconductor layer12cwith the laser light L to remove the second electrode24(hole injection layer1, hole transport layer2, electron transport layer4, and electron injection layer5, seeFIG.9) on the through hole H side, in the functional layer removal step of the present embodiment.

As described above, according to the organic EL display devices50ato50cand the method for manufacturing the same of the present embodiment including the modified examples, the oxide semiconductor layer12cis provided in a circular frame shape in the non-display region N in an island shape disposed inside the display region D. Furthermore, the first opening Ma is provided in the gate insulating film13, the first interlayer insulating film15, and the second interlayer insulating film17of the TFT layer20in the non-display region N so as to expose the oxide semiconductor layer12c. Accordingly, in the functional layer removal step of the organic EL element layer forming step, the oxide semiconductor layer12cexposed from the gate insulating film13, the first interlayer insulating film15, and the second interlayer insulating film17is irradiated with the laser light L to convert energy of the laser light L to heat, so that the hole injection layer1, the hole transport layer2, the electron transport layer4, and the electron injection layer5as the common functional layer and the second electrode24, which are formed in the non-display region N, can be removed. Here, the oxide semiconductor layer12chas a lower light reflectance than that of a metal layer, for example, and thus even if the oxide semiconductor layer12cis irradiated with the laser light L, reflection of the laser light L is suppressed, so that damage to the organic EL layer23due to stray light of the reflected light of the laser light L can be suppressed. As a result, damage to the organic EL layer23provided in each subpixel P in the display region D is suppressed, so that the common functional layer in the non-display region N can be removed while suppressing damage to the organic EL layer23in the display region D. In addition, as described above, the oxide semiconductor layer12chas a low light reflectance, and thus damage to a laser light irradiation device caused by the reflected light of the laser light L can be suppressed. Furthermore, the oxide semiconductor layer12chas a low light reflectance, and thus reflection due to external light can be suppressed, so that a reduction in display quality due to unnecessary reflected light can be suppressed.

In addition, according to the organic EL display devices50ato50cand the method for manufacturing the same of the present embodiment including the modified examples, in the non-display region N, the lower second inorganic insulating film36and the oxide semiconductor layer12care in contact with each other via the second opening Mb formed in the hole injection layer1, the hole transport layer2, the electron transport layer4, and the electron injection layer5and the third opening Mc formed in the second electrode24. Thus, sealing performance due to the sealing film40can be reliably ensured.

Second Embodiment

FIG.13illustrates a second embodiment of a display device and a method for manufacturing the same according to the disclosure. Here,FIG.13is a cross-sectional view of a non-display region of an organic EL display device50daccording to the present embodiment, and is a view corresponding toFIG.9. Note that, in the following embodiment, portions identical to those inFIG.1toFIG.12are denoted by the same reference signs, and their detailed descriptions are omitted.

In the first embodiment described above, the organic EL display devices50ato50cin which the surface between the fourth opening Md and the through hole H is provided flat in the non-display region N are exemplified. However, the disclosure may be embodied by the organic EL display device50din which a structure having a convex shape is provided between the fourth opening Md and the through hole H.

As with the organic EL display device50aof the first embodiment described above, the organic EL display device50dincludes the display region D provided in a rectangular shape in which an image is displayed and the frame region F provided in a frame-like shape in a periphery of the display region D.

The configuration of the display region D and the frame region F of the organic EL display device50dis substantially the same as the configuration of the display region D and the frame region F of the organic EL display device50aaccording to the first embodiment described above.

As illustrated inFIG.13, the organic EL display device50dincludes the first internal dam wall We and the second internal dam wall Wd each provided in a circular frame shape from the display region D side so as to surround an oxide semiconductor layer12d, which will be described below, in a plan view, in the non-display region N.

As illustrated inFIG.13, the organic EL display device50dincludes a plurality of non-display photospacers22ceach provided in an island shape as the third photospacers so as to project upward in the drawing, on the flattening film19aon the display region D side of the first internal dam wall We in the non-display region N.

As illustrated inFIG.13, the organic EL display device50dincludes the oxide semiconductor layer12dprovided in an island shape having a triple concentric circular frame shape in the non-display region N along the peripheral edge of the through hole H, that is, along the boundary with the display region D. Here, the oxide semiconductor layer12dis provided on the base coat film11, and is formed of the same material as and in the same layer as those of the semiconductor layers12aand12b. In addition, as illustrated inFIG.13, the peripheral end portion of the oxide semiconductor layer12don the through hole H side has a side surface flush with the side surface of the through hole H and is provided along the peripheral edge of the through hole H. Furthermore, as illustrated inFIG.13, the peripheral end portion of the oxide semiconductor layer12don the second internal dam wall Wd side is covered by the gate insulating film13. In addition, as illustrated inFIG.13, the first opening Ma is provided in the gate insulating film13, the first interlayer insulating film15, and the second interlayer insulating film17so as to surround the through hole H in a plan view and expose the oxide semiconductor layer12d, in the non-display region N. Note that, as illustrated inFIG.13, the peripheral portion of the first opening Ma is provided so as to cover the outer peripheral end portion of the oxide semiconductor layer12d, and is configured to function as an etching stopper when the oxide semiconductor layer12dforms the first opening Ma. As illustrated inFIG.13, the second electrode24is provided so as to extend from the display region D to the non-display region N. In addition, as illustrated inFIG.13, the third opening Mc is provided in a frame-like shape in the second electrode24so as to surround the through hole H in a plan view and expose the oxide semiconductor layer12d. Note that although the hole injection layer1, the hole transport layer2, the electron transport layer4, and the electron injection layer5are not illustrated inFIG.13, the common functional layer including the hole injection layer1, the hole transport layer2, the electron transport layer4, and the electron injection layer5is provided so as to extend from the display region D to the non-display region N as with the second electrode24, and the second opening Mb is provided in a frame-like shape in the common functional layer so as to surround the through hole H in a plan view and expose the oxide semiconductor layer12d. Furthermore, as illustrated inFIG.13, the peripheral ends of the second opening Mb and the third opening Mc coincide with each other, and the oxide semiconductor layer12dand the lower second inorganic insulating film36of the sealing film40are in contact with each other via the second opening Mb and the third opening Mc.

As illustrated inFIG.13, the organic EL display device50dincludes, in the non-display region N, a pair of layered thick film portions E provided in a frame-like shape so as to surround the through hole H, between the first opening Ma and the through hole H, specifically between the fourth opening Md and the through hole H.

As illustrated inFIG.13, each of the layered thick film portions E includes the base coat film11, the gate insulating film13, a thick film gate metal layer14e, the first interlayer insulating film15, a thick film intermediate metal layer16d, the second interlayer insulating film17, and a thick film source metal layer18m, which are sequentially provided as a plurality of inorganic films in this order, over the resin substrate layer10. Here, the total thickness of the plurality of inorganic films (base coat film11to thick film source metal layer18m) in each of the layered thick film portions E is greater than the total thickness of the plurality of inorganic films (base coat film11to oxide semiconductor layer12d) in the through hole H.

As illustrated inFIG.13, in the organic EL display device50d, in the non-display region N, a resin layer19gis provided in a frame-like shape so as to surround the through hole H in a plan view between the first opening Ma and the through hole H, specifically between the fourth opening Md and the through hole H. Here, the resin layer19gis formed of the same material as and in the same layer as those of the flattening film19a. In addition, as illustrated inFIG.13, a plurality of fourth photospacers22gare each provided in an island shape on the resin layer19g. Note that as illustrated inFIG.13, a height Hd of each of the fourth photospacers22gfrom the upper face of the resin substrate layer10is the same as a height Ha of each of the pixel photospacers22p(seeFIG.3), a height Hb of each of the frame photospacers22b(seeFIG.6), and a height Hc of each of the non-display photospacers22c, from the upper face of the resin substrate layer10. In addition, as illustrated inFIG.13, the pair of layered thick film portions E are provided inside the resin layer19g. Furthermore, as illustrated inFIG.13, the lower second inorganic insulating film36and the upper second inorganic insulating film38of the sealing film40are provided so as to surround the resin layer19gand the layered thick film portions E.

The organic EL display device50dincludes a camera45installed as an electronic component inside the through hole H in the non-display region N.

Similarly to the organic EL display device50aof the first embodiment, the organic EL display device50ddescribed above is flexible and is configured to display an image by causing the light-emitting layer3of the organic EL layer23to emit light as required, via the first TFT9aand the second TFT9bin each of the subpixels P.

The organic EL display device50dof the present embodiment can be manufactured by forming the layered thick film portion E when forming the first TFT9aand the second TFT9b, forming the resin layer19gwhen forming the flattening film19a, and forming the fourth photospacers22gwhen forming the edge cover22ain the method for manufacturing the organic EL display device50aof the first embodiment.

As described above, according to the organic EL display device50dand the method for manufacturing the same of the present embodiment, the oxide semiconductor layer12dis provided in a circular frame shape in the non-display region N in an island shape disposed inside the display region D. Furthermore, the first opening Ma is provided in the gate insulating film13, the first interlayer insulating film15, and the second interlayer insulating film17of the TFT layer20in the non-display region N so as to expose the oxide semiconductor layer12d. Accordingly, in the functional layer removal step of the organic EL element layer forming step, the oxide semiconductor layer12dexposed from the gate insulating film13, the first interlayer insulating film15, and the second interlayer insulating film17is irradiated with the laser light L to convert energy of the laser light L to heat, so that the hole injection layer1, the hole transport layer2, the electron transport layer4, the electron injection layer5, and the second electrode24formed in the non-display region N can be removed. Here, the oxide semiconductor layer12dhas a lower light reflectance than that of the metal layer, for example, and thus even if the oxide semiconductor layer12dis irradiated with the laser light L, reflection of the laser light L is suppressed, so that damage to the organic EL layer23due to the reflected light of the laser light L can be suppressed. As a result, damage to the organic EL layer23provided in each subpixel P in the display region D is suppressed, so that the common functional layer in the non-display region N can be removed while suppressing damage to the organic EL layer23in the display region D. In addition, as described above, the oxide semiconductor layer12dhas a low light reflectance, and thus damage to the laser light irradiation device caused by the reflected light of the laser light L can be suppressed. Furthermore, the oxide semiconductor layer12dhas a low light reflectance, and thus reflection due to external light can be suppressed, so that a reduction in display quality due to unnecessary reflected light can be suppressed.

In addition, according to the organic EL display device50dand the method for manufacturing the same of the present embodiment, in the non-display region N, the lower second inorganic insulating film36and the oxide semiconductor layer12dare in contact with each other via the second opening Mb formed in the hole injection layer1, the hole transport layer2, the electron transport layer4, and the electron injection layer5and the third opening Mc formed in the second electrode24, and thus sealing performance due to the sealing film40can be reliably ensured.

Furthermore, according to the organic EL display device50dand the method for manufacturing the same of the present embodiment, acoustic compliances (volume/(density×sound velocity2)) of the plurality of inorganic films constituting each of the layered thick film portions E are almost the same. Thus, by disposing the layered thick film portions E having a thickness greater than the total film thickness of the inorganic films in the through holes H in the periphery of the through hole H, propagation of cracks formed on the side surface of the through hole H to the display region D side can be suppressed.

Other Embodiments

In each of the embodiments described above, the organic EL layer having a five-layered structure including the hole injection layer, the hole transport layer, the light-emitting layer, the electron transport layer, and the electron injection layer is exemplified, but the organic EL layer may have a three-layered structure including a hole injection-cum-transport layer, a light-emitting layer, and an electron transport-cum-injection layer, for example.

In each of the embodiments described above, the organic EL display device including the first electrode as an anode and the second electrode as a cathode is exemplified. The disclosure is also applicable to an organic EL display device in which the layered structure of the organic EL layer is reversed with the first electrode being a cathode and the second electrode being an anode.

In the above-described embodiments, the example of the organic EL display device in which the electrode of the TFT connected to the first electrode serves as the drain electrode is given. However, the disclosure is also applicable to an organic EL display device in which the electrode of the TFT connected to the first electrode is referred to as the source electrode.

In the embodiments described above, the organic EL display devices50ato50deach having the through hole H formed in a circular shape in a plan view are exemplified, but the through hole H may have a polygonal shape such as a rectangular shape in a plan view, for example.

In the embodiments described above, the organic EL display devices50ato50deach including the sealing film40in which the organic insulating film37is provided between the lower second inorganic insulating film36and the upper second inorganic insulating film38are exemplified, but the disclosure is also applicable to an organic EL display device obtained by forming an organic vapor deposition film between the lower second inorganic insulating film36and the upper second inorganic insulating film38, and then ashing the organic vapor deposition film to cover foreign matters with the organic vapor deposition film. According to such a configuration of the sealing film, even if a foreign matter is present on the display region, the sealing performance can be ensured by the upper second inorganic insulating film, and the reliability can be improved.

In addition, in each of the embodiments described above, the organic EL display device is exemplified and described as the display device. The disclosure is, however, not limited to the organic EL display device and also applicable to any flexible display device. For example, the disclosure is applicable to a flexible display device including QLEDs or the like that are light-emitting elements using a quantum dot containing layer.

INDUSTRIAL APPLICABILITY

As described above, the disclosure is useful for a flexible display device.