JP2009054371A - Display unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display unit that ensures excellent display quality and an extended lifetime. <P>SOLUTION: A display unit which has an active area composed of many pixels comprises an organic insulation film 114 that is divided into an island-shaped pixel center 114C and a pixel peripheral part 114S surrounding the pixel center 114C, a first electrode 60 that is arranged at each pixel on the organic insulation film 114 and extends from the pixel center 114C to the pixel peripheral part 114S, a bulkhead 70 arranged to cover the peripheral edge of the first electrode 60 on the pixel peripheral part 114S of the organic insulation film 114 for separating each pixel, an organic active layer 62 arranged on the first electrode 60, and a second electrode 64 that is arranged on the organic active layer 62 and is shared by many pixels in common. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a display device, and more particularly to a display device having a structure including a self-luminous display element.

  In recent years, organic electroluminescence (EL) display devices have attracted attention as flat display devices. Since this organic EL display device includes an organic EL element that is a self-luminous element, the viewing angle is wide, the backlight can be thinned, the power consumption can be reduced, and the response speed can be reduced. It has the feature of being fast.

  Because of these features, organic EL display devices are attracting attention as potential candidates for next-generation flat display devices that replace liquid crystal display devices. As an organic EL display device, a bottom emission method in which EL light generated in the organic EL element is extracted from the array substrate side and an EL light generated in the organic EL element is extracted from the sealing substrate side to the outside. There is a top emission method.

  The organic EL element is provided on an array substrate together with a pixel circuit and the like, and is configured by holding an organic active layer containing an organic compound having a light emitting function between an anode and a cathode. The anode is arranged for each pixel in order to drive each pixel independently. Each pixel is separated by a partition wall. The organic EL element having such a configuration is configured to include a thin film that easily deteriorates due to the influence of moisture. For this reason, in the case of a configuration in which an organic EL element is simply formed on a substrate, a non-lighting area called a dark spot or pixel shrinkage occurs in a short time, and such an area expands as a product. It becomes unusable.

Therefore, a substrate in which a moisture absorbing material for removing moisture in the organic EL display device is provided on the organic EL element is prepared, and a sealing substrate is provided via a sealing material provided around the substrate on which the organic EL element is arranged. The structure which prevents deterioration by a water | moisture content by sticking together is proposed (for example, refer patent document 1).
JP 2002-299040 A

  In many cases, the organic EL element is arranged on a flattened base so as not to be affected by the unevenness of the lower layer. Such a base is formed by a technique such as spin coating with a resin material.

  In such an organic EL element formation process, for example, in the step of forming the organic active layer and the cathode, pinholes may be formed in the cathode due to the influence of foreign matters such as dust and dirt. Originally, the cathode is formed so as to entirely cover the partition wall, but a part of the partition wall may be exposed from the cathode by the pinhole.

  The partition wall is generally formed by patterning a resin material. Such a resin material may have some moisture permeability in nature. For this reason, there is a mode in which moisture may enter from the pinhole of the cathode and diffuse into the partition wall. In particular, in the case of the configuration in which the organic EL element is disposed on the organic insulating film serving as a base, the partition wall and the organic insulating film are connected at the anode break. For this reason, moisture that has entered from the partition walls is likely to diffuse through the organic insulating film.

  Since the organic EL element is deteriorated by moisture, the luminance is lowered, and there is a case where light is not emitted with normal luminance as time passes. In other words, in the pixels around the pinhole of the cathode, the deterioration of the organic EL element proceeds more rapidly than in the other pixels, leading to unevenness in the light emission luminance. For this reason, there is a possibility of causing a decrease in manufacturing yield.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a display device that has good display quality and can have a long lifetime.

A display device according to an aspect of the present invention includes:
A display device having an active area composed of a plurality of pixels,
An organic insulating film divided into an island-shaped pixel central portion and a pixel peripheral portion surrounding the pixel central portion;
A first electrode disposed on the organic insulating film for each pixel and extending from the pixel central portion to the pixel peripheral portion;
A partition wall is disposed on the periphery of the pixel of the organic insulating film so as to cover the periphery of the first electrode, and separates each pixel.
An organic active layer disposed on the first electrode;
A second electrode disposed on the organic active layer and common to a plurality of pixels;
It is provided with.

  According to the present invention, since the organic insulating film has a structure divided into a pixel peripheral portion where the partition wall is disposed and a pixel central portion mainly contributing to light emission, even if moisture enters the partition wall, It is possible to suppress diffusion from the peripheral portion to the pixel central portion. For this reason, rapid deterioration of some pixels can be suppressed, and unevenness in light emission luminance can be suppressed, so that display quality can be improved and life can be extended. Therefore, the production yield can be improved, and a large amount of desiccant is not required, so that an increase in cost can be suppressed. In particular, in the top emission method, a sufficient countermeasure against moisture can be realized with a small amount of desiccant.

  A display device according to an embodiment of the present invention will be described below with reference to the drawings. In this embodiment, a self-luminous display device such as an organic EL (electroluminescence) display device will be described as an example of the display device.

  As shown in FIG. 1, the organic EL display device 1 includes an array substrate 100 having an active area 102 for displaying an image. The active area 102 is composed of a plurality of pixels PX arranged in a matrix. Further, FIG. 1 shows a color display type organic EL display device 1 as an example, and the active area 102 includes a plurality of types of color pixels, for example, a red pixel PXR, a green pixel PXG, and a blue color corresponding to three primary colors. A pixel PXB is used.

  At least the active area 102 of the array substrate 100 is sealed with a sealing body 200. That is, the array substrate 100 and the sealing body 200 are bonded together by the sealing material 300 arranged in a frame shape so as to surround the active area 102. The sealing material 300 may be a photosensitive resin (for example, an ultraviolet curable resin) or a frit.

  Each pixel PX (R, G, B) includes a pixel circuit 10 and a display element 40 that is driven and controlled by the pixel circuit 10. The pixel circuit 10 shown in FIG. 1 is an example, and it goes without saying that a pixel circuit having another configuration may be applied. In the example shown in FIG. 1, the pixel circuit 10 includes a drive transistor DRT, a first switch SW1, a second switch SW2, a third switch SW3, a storage capacitor element CS, and the like. The drive transistor DRT has a function of controlling the amount of current supplied to the display element 40. The first switch SW1 and the second switch SW2 function as a sample / hold switch. The third switch element SW3 has a function of controlling driving current supply from the driving transistor DRT to the display element 40, that is, on / off of the display element 40. The storage capacitor element CS has a function of holding the potential between the gate and source of the drive transistor DRT.

  The drive transistor DRT is connected between the high potential power supply line P1 and the third switch SW3. The display element 40 is connected between the third switch SW3 and the low potential power line P2. The gate electrodes of the first switch SW1 and the second switch SW2 are connected to the first gate line GL1. The gate electrode of the third switch SW3 is connected to the second gate line GL2. The source electrode of the first switch SW1 is connected to the video signal line SL. The drive transistor DRT, the first switch SW1, the second switch SW2, and the third switch element SW3 are configured by, for example, thin film transistors, and the semiconductor layer is formed of polysilicon here.

  In the case of such a circuit configuration, the first switch SW1 and the second switch SW2 are turned on based on the ON signal supplied from the first gate line GL1, and the high potential is set according to the amount of current flowing through the video signal line SL. A current flows from the power supply line P1 to the drive transistor DRT, and the storage capacitor element CS is charged according to the current flowing through the drive transistor DRT. As a result, the drive transistor DRT can supply the same amount of current as that supplied from the video signal line SL to the display element 40 from the high potential power supply line P1.

  Then, the third switch SW3 is turned on based on the ON signal supplied from the second gate line GL2, and the driving transistor DRT is connected to the first potential from the high potential power supply line P1 according to the capacitance held in the storage capacitor element CS. A predetermined amount of current corresponding to a predetermined luminance is supplied to the display element 40 via the three switch SW3. Thereby, the display element 40 emits light with a predetermined luminance.

  The display element 40 includes an organic EL element 40 (R, G, B) that is a self-luminous display element. That is, the red pixel PXR includes an organic EL element 40R that mainly emits light corresponding to the red wavelength. The green pixel PXG includes an organic EL element 40G that mainly emits light corresponding to the green wavelength. The blue pixel PXB includes an organic EL element 40B that mainly emits light corresponding to the blue wavelength.

The various organic EL elements 40 (R, G, B) have basically the same configuration, and are disposed on the wiring board 120 as shown in FIG. The wiring board 120 includes an insulating layer such as an undercoat layer 111, a gate insulating film 112, an interlayer insulating film 113, and an organic insulating film 114 on an insulating support substrate 101 such as a glass substrate or a plastic sheet. , And various switches SW, driving transistors DRT, storage capacitor elements Cs, various wirings (gate lines, video signal lines, power supply lines, etc.), and the like. The undercoat layer 111, the gate insulating film 112, and the interlayer insulating film 113 are formed of an inorganic material having a lower water permeability than the resin material, such as a silicon oxide film (SiO ₂ ) or a silicon nitride film (SiN). Yes. Note that a passivation film formed of an inorganic material (such as a silicon oxide film or a silicon nitride film) may be disposed between the interlayer insulating film 113 and the organic insulating film 114 as necessary.

  That is, in the example shown in FIG. 2, the semiconductor layer 21 of the transistor element (the third switch SW3 in the circuit configuration shown in FIG. 1) 20 is disposed on the undercoat layer 111. ing. The semiconductor layer 21 is covered with the gate insulating film 112. On the gate insulating film 112, the gate electrode 20G of the transistor element 20 and the like are disposed. The gate electrode 20G is covered with an interlayer insulating film 113. On the interlayer insulating film 113, the source electrode 20S and the drain electrode 20D of the transistor element 20 are disposed. The source electrode 20S and the drain electrode 20D are in contact with the semiconductor layer 21 through contact holes that penetrate the gate insulating film 112 and the interlayer insulating film 113 to the semiconductor layer 21, respectively.

  The source electrode 20S and the drain electrode 20D are covered with an organic insulating film 114. Such an organic insulating film 114 is formed by a technique such as coating with a resin material in order to alleviate the influence of the unevenness of the lower layer and flatten the surface.

  The organic EL element 40 is disposed on the organic insulating film 114. The organic EL element 40 has a configuration in which an organic active layer 62 is held between a first electrode 60 and a second electrode 64, and a detailed structure will be described below.

  That is, the first electrode 60 is disposed on the organic insulating film 114 in an independent island shape for each color pixel PX, and functions as an anode. The first electrode 60 is in contact with the drain electrode 20D through a contact hole CH that penetrates the organic insulating film 114 to the drain electrode 20D. The first electrode 60 is formed of a transmissive layer 60T formed of a light-transmitting conductive material such as indium tin oxide (ITO) and a light-reflective conductive material such as aluminum (Al). It is comprised by the laminated body which laminated | stacked the reflecting layer 60R. The first electrode 60 may be composed of a single transmission layer or a single reflection layer.

  The organic active layer 62 is disposed on the first electrode 60 and includes at least a light emitting layer. The organic active layer 62 can include functional layers other than the light emitting layer, and includes, for example, functional layers such as a hole injection layer, a hole transport layer, a blocking layer, an electron transport layer, an electron injection layer, and a buffer layer. it can. Such an organic active layer 62 may be composed of a single layer in which a plurality of functional layers are combined, or may have a multilayer structure in which the functional layers are laminated. In the organic active layer 62, the light emitting layer may be an organic material, and layers other than the light emitting layer may be an inorganic material or an organic material. In the organic active layer 62, the functional layer other than the light emitting layer may be a common layer. The light emitting layer is formed of an organic compound having a light emitting function that emits red, green, or blue light.

  The organic active layer 62 may include a thin film formed of a polymer material. Such a thin film can be formed by a selective coating method such as an inkjet method. The organic active layer 62 may include a thin film formed of a low molecular material. Such a thin film can be formed by a technique such as mask vapor deposition.

  The second electrode 64 is common to the plurality of color pixels PX, is disposed on the organic active layer 62 of each color pixel PX, and functions as a cathode. The second electrode 64 may include a semi-transmissive layer. That is, the second electrode 64 is disposed between a transmissive layer formed using a light-transmitting conductive material such as ITO, and between the transmissive layer and the organic active layer 62. Silver (Ag) and magnesium (Mg) It may be a two-layer structure with a semi-transparent layer formed of a mixture thereof or a semi-transparent layer electrode. Needless to say, the second electrode 64 may be formed of a single transmissive layer.

  In addition, the array substrate 100 includes a partition wall 70 that separates at least adjacent color pixels PX (R, G, B) in the active area 102. The partition wall 70 is disposed on the organic insulating film 114 so as to cover the periphery of each first electrode 60, and is formed in a lattice shape or a stripe shape in the active area 102. Such a partition 70 is formed by patterning a resin material, for example. The partition wall 70 is covered with the second electrode 64.

  The first embodiment will be described below.

  As shown in FIGS. 3 and 4, according to the first embodiment, the organic insulating film 114 is divided into an island-shaped pixel central portion 114C and a pixel peripheral portion 114S surrounding the pixel central portion 114C. . That is, in the organic insulating film 114, a loop-shaped groove G is formed for each color pixel. The groove G penetrates the organic insulating film 114 and reaches the lower insulating film, that is, the interlayer insulating film 113. Such a groove G can be formed in the same process as the contact hole CH, and it is not necessary to add a separate process for forming the groove G.

  Such a groove G divides the organic insulating film 114 into a pixel central portion 114C and a pixel peripheral portion 114S in each color pixel. That is, the pixel central portion 114C is formed inside the groove G, and the pixel peripheral portion 114S is formed outside the groove G.

  The first electrode 60 extends from the pixel central portion 114C to the pixel peripheral portion 114S and is disposed so as to cover the groove G, and is electrically connected between the pixel central portion 114C and the pixel peripheral portion 114S. Yes. Such a first electrode 60 is electrically connected to the drain electrode 20D of the transistor element 20 through a contact hole CH formed in the pixel peripheral portion 114S.

  The partition wall 70 is disposed on the pixel peripheral portion 114 </ b> S so as to cover the periphery of the first electrode 60. The pixel peripheral portion 114S is exposed from between the first electrodes 60 arranged in an island shape for each color pixel. For this reason, the partition wall 70 is partially connected to the pixel peripheral portion 114S. However, since the pixel peripheral portion 114S and the pixel central portion 114C are divided by the groove G, the partition wall 70 and the pixel central portion 114C are separated.

  According to the first embodiment, even if moisture enters from the partition wall 70 through the pinhole of the second electrode 64, the moisture does not diffuse into the pixel peripheral portion 114S of the organic insulating film 114. In addition, it becomes possible to suppress the diffusion of moisture to the pixel central portion 114C which mainly contributes to light emission. As a result, rapid deterioration of some of the color pixels PX can be suppressed, and unevenness in light emission luminance can be suppressed, so that display quality can be improved and life can be extended.

  The organic insulating film 114 is disposed on the interlayer insulating film 113 formed of an inorganic material with low water permeability. For this reason, it is possible to suppress diffusion of moisture from the pixel peripheral portion 114S to the pixel central portion 114C via the base of the organic insulating film 114 only by forming the groove G penetrating the organic insulating film 114. Thereby, it is possible to further suppress the deterioration of the color pixel PX.

  Next, a second embodiment will be described.

  As shown in FIGS. 5 and 6, according to the second embodiment, the organic insulating film 114 is divided into an island-shaped pixel central portion 114C and a pixel peripheral portion 114S surrounding the pixel central portion 114C. . That is, in the second embodiment, the organic insulating film 114 is formed with a plurality of vertical grooves GY and a plurality of horizontal grooves GX for each color pixel. In the example shown here, two vertical grooves GY1 and GY2 are formed, and two horizontal grooves GX1 and GX2 are formed so as to intersect these vertical grooves. That is, a sharp symbol (#)-shaped groove is formed in the organic insulating film 114 for each color pixel.

  These vertical grooves GY and horizontal grooves GX penetrate the organic insulating film 114 and reach the lower insulating film, that is, the interlayer insulating film 113. Such vertical grooves GY and horizontal grooves GX can be formed in the same process as the contact holes CH.

  Such vertical grooves GY and horizontal grooves GX divide the organic insulating film 114 into nine 3 × 3 regions in each color pixel. That is, in the example shown in FIG. 5, when attention is paid to the color pixel PX in the center of the drawing, the organic insulating film 114 is divided into nine regions A1 to A9. The pixel center portion 114C corresponds to the center region A5 and is formed on the inner side surrounded by the two vertical grooves GY1 and GY2 and the two horizontal grooves GX1 and GX2. The pixel peripheral portion 114S corresponds to the peripheral eight regions A1 to A4 and A6 to A9.

  The first electrode 60 extends from the pixel central portion 114C to the pixel peripheral portion 114S and is disposed so as to cover the groove G, and is electrically connected between the pixel central portion 114C and the pixel peripheral portion 114S. Yes. Such a first electrode 60 is electrically connected to the drain electrode 20D of the transistor element 20 through a contact hole CH formed in the pixel peripheral portion 114S, that is, the region A2.

  The partition wall 70 is disposed on the pixel peripheral portion 114 </ b> S so as to cover the periphery of the first electrode 60. The pixel peripheral portion 114S is exposed from between the first electrodes 60 arranged in an island shape for each color pixel. For this reason, the partition wall 70 is partially connected to the pixel peripheral portion 114S. However, since the pixel peripheral portion 114S and the pixel central portion 114C are divided by the vertical groove GY and the horizontal groove GX, the partition wall 70 and the pixel central portion 114C are separated. Further, the pixel peripheral portion 114S is also divided into a plurality of regions by the vertical grooves GY and the horizontal grooves GX.

  According to the second embodiment, since the pixel central portion 114C and the pixel peripheral portion 114S are divided, even if moisture enters from the partition wall 70 through the pinhole of the second electrode 64, the organic portion It becomes possible to suppress the diffusion of moisture from the pixel peripheral portion 114S of the insulating film 114 to the pixel central portion 114C. In addition, since the pixel peripheral portion 114S is divided into a plurality of regions, it is possible to suppress diffusion of moisture that has entered from the partition wall 70 in the pixel peripheral portion 114S.

  Thereby, it is possible to suppress the rapid deterioration of some of the color pixels PX as compared with the first embodiment described above.

  Next, the effect of the organic EL display device according to this embodiment was verified.

  First, a glass substrate (support substrate) having a size (400 mm × 500 mm) capable of forming 24 array substrates having a diagonal size of 3.5 inches in the active area 102 is prepared, and three types (A, B, C) are prepared. ) Sample was prepared.

  The sample A has a configuration including a solid organic insulating film 114 having a full surface without grooves. The first electrode 60 includes a reflective layer 60R disposed on the organic insulating film 114 and a transmissive layer 60T stacked on the reflective layer 60R, and a transistor element through a contact hole formed in the organic insulating film 114. 20 is electrically connected. That is, the organic insulating film 114 is exposed from between the first electrodes 60 of the adjacent color pixels, and is connected to the partition wall 70 at the exposed portion. The partition walls 70 are formed in a lattice shape on the organic insulating film 114.

  Sample B corresponds to the first embodiment, and includes an organic insulating film 114 divided into a pixel central portion 114C and a pixel peripheral portion 114S by a groove G as shown in FIG. Like the sample A, the first electrode 60 includes a reflective layer 60R and a transmissive layer 60T, extends to the pixel central portion 114C and the pixel peripheral portion 114S, and is a transistor element through a contact hole formed in the pixel peripheral portion 114S. 20 is connected. The partition wall 70 is formed in a lattice shape on the pixel peripheral portion 114S.

  The sample C corresponds to the second embodiment, and has a configuration including the organic insulating film 114 divided into nine by the vertical groove GY and the horizontal groove GX as shown in FIG. Like the sample A, the first electrode 60 includes a reflective layer 60R and a transmissive layer 60T, extends to the pixel central portion 114C and the pixel peripheral portion 114S, and is a transistor element through a contact hole formed in the pixel peripheral portion 114S. 20 is connected. The partition wall 70 is formed in a lattice shape on the pixel peripheral portion 114S.

With respect to the three types of samples described above, each substrate on which the first electrode 60 and the partition wall 70 are formed is set in a resistance heating type organic EL film forming apparatus, and the organic active layer 62 serves as a hole transport layer. After depositing NPD to a thickness of 200 nm, Alq ₃ functioning as a light emitting layer / electron transport layer is deposited to a thickness of 50 nm, and MgAg is deposited to a thickness of 2 nm as an electron injection layer / damage buffer layer. A film was formed. Then, ITO having a film thickness of 100 nm was formed as the second electrode 64 on the substrate on which these organic active layers had been formed, using the plasma coating method.

  The active area 102 of each sample was sealed with a sealing body 200. That is, an ultraviolet curable resin material was applied in a frame shape on the sealing body 200, and then bonded to the array substrate of each sample, and the resin material was cured by ultraviolet irradiation under a predetermined condition. Thereby, an organic EL element is arrange | positioned in airtight space. After cleaving the substrate pair of each sample, peripheral circuits were mounted, and 24 organic EL display devices were created for each sample. In addition, in order to confirm a remarkable effect in a short time for each sample, a normally necessary desiccant was not installed in the airtight space.

  These 3x24 organic EL display devices are left in a high-temperature, high-humidity environment (85 ° C x 85% RH), and the display is checked after a lapse of a predetermined time to show the state of deterioration due to moisture such as dark spots. It was observed visually. The result is shown in FIG.

From the results shown in FIG. 7, in the sample A having the configuration in which the organic insulating film and the partition wall are connected, the occurrence of dark spots was confirmed before the other samples (after about 20 hours), and the influence of moisture It was confirmed that deterioration is likely to proceed. On the other hand, for samples B and C having a configuration in which the organic insulating film is divided into the pixel central portion and the pixel peripheral portion, it was confirmed that the occurrence of deterioration due to the influence of moisture such as dark spots can be delayed. For sample B, dark spots were confirmed after about 30 hours, and for sample C, dark spots were confirmed after about 35 hours. In particular, it was confirmed that in the configuration in which the pixel peripheral portion is divided into a plurality of regions as in Sample C, the diffusion of moisture is further suppressed and the progress of the deterioration of the organic EL element can be suppressed. Samples B and C were observed with a microscope, and although a dark spot was partially generated in the periphery of the pixel, the light emission luminance at the center of the pixel was sufficient, which affected visual evaluation. It has been found that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the stage of implementation. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

  For example, the partition wall 70 may have at least one dividing portion on one side per pixel. That is, since the partition wall 70 is formed in a lattice shape or a stripe shape, moisture that has entered the partition wall 70 is likely to diffuse along the direction in which the partition wall 70 extends. Therefore, by dividing a part of the partition wall 70, it is possible to suppress the diffusion of moisture in the partition wall 70.

FIG. 1 is a diagram schematically showing a configuration of an organic EL display device according to an embodiment of the present invention. FIG. 2 is a cross-sectional view schematically showing a structure when the organic EL display device shown in FIG. 1 is cut. FIG. 3 is a plan view schematically showing the shape of the array substrate of the organic EL display device according to the first embodiment, particularly the shape of the organic insulating film. FIG. 4 is a cross-sectional view schematically showing a structure when the array substrate according to the first embodiment shown in FIG. 3 is cut along IV-IV. FIG. 5 is a plan view schematically showing the shape of the array substrate, in particular, the organic insulating film, of the organic EL display device according to the second embodiment. FIG. 6 is a cross-sectional view schematically showing a structure when the array substrate according to the second embodiment shown in FIG. 5 is cut along VI-VI. FIG. 7 is a diagram illustrating a verification result of the effect obtained by dividing the organic insulating film into the pixel central portion and the pixel peripheral portion.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Organic EL display device PX (R, G, B) ... Color pixel 10 ... Pixel circuit DRT ... Drive transistor SW1 ... First switch SW2 ... Second switch SW3 ... Third switch Cs ... Storage capacitor element 40 ... Organic EL element DESCRIPTION OF SYMBOLS 60 ... 1st electrode 62 ... Organic active layer 64 ... 2nd electrode 70 ... Partition 100 ... Array substrate 102 ... Active area 104 ... Peripheral area 114 ... Organic insulating film G ... Groove GY ... Vertical groove GX ... Horizontal groove 120 ... Wiring board 200 ... sealed body

Claims (4)

A display device having an active area composed of a plurality of pixels,
An organic insulating film divided into an island-shaped pixel central portion and a pixel peripheral portion surrounding the pixel central portion;
A first electrode disposed on the organic insulating film for each pixel and extending from the pixel central portion to the pixel peripheral portion;
A partition wall is disposed on the periphery of the pixel of the organic insulating film so as to cover the periphery of the first electrode, and separates each pixel.
An organic active layer disposed on the first electrode;
A second electrode disposed on the organic active layer and common to a plurality of pixels;
A display device comprising: In the organic insulating film, a loop-shaped groove is formed for each pixel,
The display device according to claim 1, wherein the pixel central portion is formed inside the groove. In the organic insulating film, a plurality of vertical grooves and a plurality of horizontal grooves are formed for each pixel,
The display device according to claim 1, wherein the central portion of the pixel is formed inside a plurality of vertical grooves and horizontal grooves.   The display device according to claim 1, wherein the organic insulating film is disposed on an insulating film formed of an inorganic material.

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