JP2015103359A - Display device, and manufacturing method of display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify processes for connecting auxiliary wirings and an upper electrode.SOLUTION: A display device of the present invention is a display device having a plurality of pixels and includes: pixel electrodes that are provided corresponding to the pixels; a plurality of auxiliary wirings including a first auxiliary wiring having a first end and a second auxiliary wiring having a second end, where the first end and the second end are arranged opposite to each other in a distance shorter than the distance between the auxiliary wirings and the plurality of pixel electrodes in at least a part between the pixel electrodes; an insulating layer that has a first opening exposing a part of the pixel electrodes and a second opening exposing the first end, second end, and portions between the ends, and is arranged on the pixel electrodes and auxiliary wirings; an organic light-emitting layer that is arranged on the pixel electrodes exposed by the first opening and on the insulating layer; and a conductive layer that includes an electrode arranged on the organic light-emitting layer on the pixel electrodes and a connection part that electrically connects the electrode and the auxiliary wirings in the second opening.

Description

  The present invention relates to a technique for improving the image quality of a display device.

  In recent years, display devices using elements that emit light with an intensity corresponding to a supplied current, such as organic EL (Organic Electroluminescence), have been developed. As such a display device, there is a top emission type active matrix organic EL display. According to this display device, the light emitting direction of the light emitting element is opposite to that of a thin film transistor (TFT). Therefore, a light-transmitting metal (thin film) or a transparent conductive oxide is used for an electrode (hereinafter referred to as the upper electrode) on the light emitting direction side (the side opposite to the TFT) of the light emitting element. There is a need. However, it is difficult to reduce the resistance of these, and a luminance distribution in the screen is generated due to a voltage drop.

  This luminance distribution becomes more prominent as the luminance becomes higher and a larger screen is required. Therefore, attempts have been made to reduce the voltage drop by connecting to the upper electrode using the auxiliary wiring (for example, Patent Documents 1 to 4).

JP 2001-195008 A Japanese Patent Laid-Open No. 2001-230086 JP 2005-011810 A JP 2005-093398 A

  When forming an organic EL layer, the more layers that can be formed in common, the easier the manufacturing. In that case, as in the methods disclosed in Patent Documents 3 and 4, a step of removing the organic film formed on the auxiliary wiring is added, or when the organic film is formed on the auxiliary wiring. It is necessary to prevent it from adhering. Therefore, since the process becomes complicated, it can be a factor of reducing the yield during mass production.

  For example, in the method disclosed in Patent Literature 3, a shielding mask for irradiating a laser to only a necessary portion is aligned with a large screen display, or high-definition alignment is performed in a vacuum. It is necessary to perform spot irradiation of the laser many times while performing.

  One of the objects of the present invention is to simplify the process for connecting the auxiliary wiring and the upper electrode.

  According to one embodiment of the present invention, a display device having a plurality of pixels, including a pixel electrode provided corresponding to the pixels, a first auxiliary wiring having a first end, and a second end. A plurality of auxiliary wirings including a second auxiliary wiring, wherein at least a part of the plurality of pixel electrodes is shorter than the distance between the auxiliary wiring and the pixel electrodes, The auxiliary wiring that faces the second end, the first opening that exposes a part of the pixel electrode, and the first end, the second end, and between these ends are exposed. An insulating layer having a second opening and disposed on the pixel electrode and the auxiliary wiring; and an organic light emitting layer disposed on the pixel electrode and the insulating layer exposed by the first opening; An electrode disposed on the organic light emitting layer on the pixel electrode, and Display device characterized by comprising a conductive layer including the auxiliary wiring and connecting portions for electrically connecting the corresponding electrode in the serial second opening is provided.

  According to this display device, the process for connecting the auxiliary wiring and the upper electrode can be simplified.

  In another preferred embodiment, the distance between the end portions may be 5 micrometers to 100 micrometers.

  According to this display device, the organic light emitting layer in the vicinity of the end portions can be efficiently removed.

  In another preferred embodiment, there are a plurality of connection portions between the auxiliary wiring and the conductive layer electrically connected through the second opening, and the connection portions have a connection resistance of 200 kΩ or less. A connection portion may be included.

  According to this display device, the luminance distribution in the screen can be improved.

  In another preferred embodiment, the power supply connection electrode to which power for causing the organic light emitting layer to emit light is supplied, the power supply connection electrode is connected to the conductive layer, and the auxiliary wiring is connected to the conductive layer. It may be indirectly connected through a layer.

  According to this display device, the degree of freedom in the layout of the auxiliary wiring and the power connection electrode can be improved.

  According to an embodiment of the present invention, a method for manufacturing a display device having pixel electrodes corresponding to a plurality of pixels, the first auxiliary wiring having a first end and the second auxiliary wiring having a second end, The first end and the second end at a distance shorter than the distance between the auxiliary wiring and the pixel electrode in at least a part between the plurality of pixel electrodes. A first opening that exposes a part of the pixel electrode, a first end, the second end, and a second opening that exposes between these ends are formed. An insulating layer having a portion on the pixel electrode and the auxiliary wiring, and on the pixel electrode exposed by the first opening, the auxiliary wiring exposed by the second opening, and the insulation An organic light emitting layer is formed on the layer, and the first auxiliary wiring and the first auxiliary wiring are formed. A voltage is applied between the auxiliary wiring to cause a discharge between the ends, and the organic light emitting layer is removed so that at least a part of the auxiliary wiring exposed in the second opening is exposed, Forming an electrode disposed on the organic light emitting layer on the pixel electrode, and a conductive layer including a connection portion that electrically connects the electrode to the auxiliary wiring exposed in the second opening; A method for manufacturing a display device is provided.

  According to the method for manufacturing the display device, the process for connecting the auxiliary wiring and the upper electrode can be simplified.

  According to the present invention, the process for connecting the auxiliary wiring and the upper electrode can be simplified.

It is the schematic which shows the structure of the display apparatus in 1st Embodiment of this invention. It is a figure explaining the layout of the auxiliary wiring in 1st Embodiment of this invention. It is a figure explaining the layout of the 2nd opening part vicinity in 1st Embodiment of this invention. It is the schematic diagram of the cross section seen in the IV-IV 'direction shown in FIG. In the manufacturing method of the display apparatus 1 in 1st Embodiment of this invention, it is a schematic diagram which shows the cross section of the board | substrate with which the pixel electrode and auxiliary wiring were formed. In the manufacturing method of the display apparatus in a 1st embodiment of the present invention, it is a mimetic diagram showing the section of the substrate in which the insulating film was formed. It is a schematic diagram which shows the cross section of the board | substrate with which the organic EL layer was formed in the manufacturing method of the display apparatus in 1st Embodiment of this invention. It is a schematic diagram which shows the cross section of the board | substrate from which the organic EL layer between edge parts was removed in the manufacturing method of the display apparatus in 1st Embodiment of this invention. It is a figure explaining the divided voltage application to the auxiliary wiring of the display apparatus in 2nd Embodiment of this invention. It is a figure explaining the 1st example of the shape of the auxiliary wiring edge part in 3rd Embodiment of this invention. It is a figure explaining the 2nd example of the shape of the auxiliary wiring edge part in 3rd Embodiment of this invention. It is a figure explaining the layout of the auxiliary wiring for contact resistance measurement.

  Hereinafter, a display device according to an embodiment of the present invention will be described in detail with reference to the drawings. The following embodiments are examples of the embodiments of the present invention, and the present invention is not construed as being limited to these embodiments, and various modifications can be made. Further, in the drawings referred to in the present embodiment, the same part or a part having a similar function is denoted by the same reference numeral or a similar reference numeral (a reference numeral simply appended with A, B, etc.) and repeated. The description of may be omitted. In addition, the dimensional ratio in the drawing may be different from the actual ratio for convenience of explanation, or a part of the configuration may be omitted from the drawing. The term “formed on the substrate” includes not only the case of being formed in contact with the substrate but also the case of being formed with another configuration between the substrate and the substrate.

<First Embodiment>
A display device according to a first embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic diagram showing a configuration of a display device according to the first embodiment of the present invention. The display device 1 is a top emission type organic EL display. The display device 1 is used for electronic devices that display images, such as smartphones, mobile phones, personal computers, and televisions. The substrate 10 is formed with elements for driving the display device 1. The substrate 10 is provided with a display area 100, drive circuits 71, 72, 73, 74 provided around the display area 100, and a voltage application unit 70.

  In the display region 100, a plurality of pixels whose light emission of the organic EL layer is controlled by the TFT and a control line for controlling the plurality of pixels are formed. In the display area 100, two lines of auxiliary wiring connected to the upper electrode of the organic EL layer are formed. Details of the auxiliary wiring will be described later. The drive circuits 71, 72, 73, and 74 are drivers for controlling the pixel circuits provided in the respective pixels of the display area 100 through control lines. Further, a power supply connection electrode for connecting a power supply for supplying power for causing the organic EL layer to emit light and an upper electrode is provided outside the display region 100. The voltage application unit 70 is connected to a power supply for applying an alternating voltage to the two auxiliary wirings. In addition, although demonstrated in this example as an alternating voltage, the power supply for applying a direct current voltage to two auxiliary wirings may be connected.

  FIG. 2 is a diagram for explaining the layout of the auxiliary wiring in the first embodiment of the present invention. FIG. 2 is a diagram in which a part of the configuration is omitted so that the layout of the auxiliary wiring in the display area 100 can be easily understood.

  The pixel electrodes 110B, 110G, and 110R (hereinafter referred to as the pixel electrode 110 when not distinguished from each other) correspond to pixels whose emission colors are blue, green, and red, respectively. Each pixel electrode 110 is connected to a pixel circuit formed using a TFT. The example of the design value described below is an example in which the pixel pitch PP is 636 μm, but is not limited to this example.

  The auxiliary wirings 210 and 220 (hereinafter referred to as the auxiliary wiring 200 when not distinguished from each other) are two systems of auxiliary wirings formed separately from each other. The auxiliary wiring 200 is provided between adjacent pixel electrodes 110. Note that the auxiliary wiring 200 may be provided between at least some of the pixel electrodes 110. The line widths L1 and L2 of the auxiliary wiring 200 are 66 μm and 22 μm in this example.

  The pixel electrode 110 and the auxiliary wiring 200 are formed of the same conductive film. In this example, the conductive film is formed by stacking a silver alloy (for example, AgPdCu) in the lower layer and a transparent conductive oxide (for example, ITO) in the upper layer. Note that the auxiliary wiring 200 may be formed using a conductive film of a layer different from that of the pixel electrode 110.

  The insulating layer 300 is formed so as to cover the pixel electrode 110 and the auxiliary wiring 200 while exposing a part of the pixel electrode 110 and a part of the auxiliary wiring 200. The insulating layer 300 is made of an organic resin such as polyimide.

  The insulating layer 300 is provided with a first opening 310 that exposes a part of the pixel electrode 110 and a second opening 320 that exposes a part of the auxiliary wiring 200. The first opening 310 connects the pixel electrode 110 and the organic EL layer, and forms a region for flowing current to the organic EL layer. The second opening 320 is a region provided for connecting the upper electrode of the organic EL layer and the auxiliary wiring 200, and is provided between the pixel electrodes 110.

  FIG. 3 is a diagram illustrating a layout in the vicinity of the second opening in the first embodiment of the present invention. A second opening 320 is provided at a portion where the end 210T of the auxiliary wiring 210 and the end 220T of the auxiliary wiring 220 face each other. In this example, the opening dimensions A1 and A2 of the second opening 320 are 15 μm (10 to 20 μm) and 35 μm (30 to 40 μm).

  A distance Wa between the end portion 210T and the end portion 220T (hereinafter also referred to as end-to-end BW) is, for example, 5 μm to 20 μm, and the distance between the pixel electrode 110 and the auxiliary wiring 200 is the closest. It is shorter than Wp (see FIG. 2). Although not shown, the distance between the end portions BW is shorter than any of the distances between the auxiliary wiring 200 and a conductive member other than the auxiliary wiring 200 such as a TFT of the pixel circuit. Is desirable.

  Returning to FIG. 2, the description will be continued. Outside the display region 100, a power supply connection electrode 250 for connecting a power supply for supplying power for causing the organic EL layer to emit light and an upper electrode is provided. The power connection electrode 250 is covered with the insulating layer 300, and a part of the power connection electrode 250 is exposed through the third opening 350.

  FIG. 4 is a schematic diagram of a cross section seen in the IV-IV ′ direction shown in FIG. 2. A substrate 1000 is a substrate including a pixel circuit formed of a TFT or the like on a glass substrate, and the surface is planarized with an insulating film such as polyimide. The pixel electrode 110B is connected to this pixel circuit through a through hole. The pixel electrode 110, the auxiliary wirings 210 and 220, and the power connection electrode 250 are formed of the same conductive film. The insulating layer 300 includes a first opening 310 exposing a part of the pixel electrode 110, a second opening 320 exposing a part of the auxiliary wiring 200, and a third opening exposing a part of the power connection electrode 250. 350 is formed. In FIG. 2 described above, the pixel electrode 110, the auxiliary wirings 210 and 220, the power connection electrode 250, and the insulating layer 300 are shown.

  The organic EL layer 400 is formed on the insulating layer 300 in the display region 100. The organic EL layer 400 is removed in the vicinity of the end-to-end BW as described later. As shown in the drawing, a residue 450 of the organic EL layer 400 may exist in the end-to-end BW. The upper electrode 500 is a conductive layer formed on the organic EL layer 400. Since the organic EL layer 400 is removed in the vicinity of the end-to-end BW, the upper electrode 500 is in contact with and electrically connected to the end 210T of the auxiliary wiring 210 and the end 220T of the auxiliary wiring 220. ing. That is, the upper electrode 500 is used to connect the electrode formed on the organic EL layer 400 (the portion where the organic EL layer 400 emits light) on the pixel electrode 110 to the end 210T and the end 220T. It has a connection part.

  In this example, the upper electrode 500 is also formed on the power connection electrode 250. Therefore, power for causing the organic EL layer 400 to emit light is supplied from the power connection electrode 250 to the upper electrode 500 on the pixel electrode 110. In this example, the pixel electrode 110 is used as an anode of the organic EL layer 400. At this time, the auxiliary wiring 200 is indirectly connected to the power connection electrode 250 via the upper electrode 500, and the electrical resistance from the power connection electrode 250 to the upper electrode 500 on the pixel electrode 110 can be reduced. it can. Since the auxiliary wiring 200 is indirectly connected to the power connection electrode 250 through the upper electrode 500, the degree of freedom in layout of the auxiliary wiring and the power connection electrode can be improved. At this time, the power connection electrode 250 and the voltage application unit 70 may be indirectly connected via the upper electrode 500.

  Note that the auxiliary wiring 200 and the power connection electrode 250 may be directly connected. In that case, the upper electrode 500 may be directly connected to the power connection electrode 250 as described above. Alternatively, they may be indirectly connected via the auxiliary wiring 200.

  Then, the manufacturing method of the display apparatus 1 as shown in FIG. 4 is demonstrated using FIGS.

  FIG. 5 is a schematic view showing a cross section of the substrate on which the pixel electrode and the auxiliary wiring are formed in the display device manufacturing method according to the first embodiment of the present invention. A conductive film is formed on the substrate 1000, and the pixel electrode 110, the auxiliary wirings 210 and 220, and the power connection electrode 250 are formed by patterning by photolithography.

  FIG. 6 is a schematic view showing a cross section of a substrate on which an insulating film is formed in the method for manufacturing a display device according to the first embodiment of the present invention. After the process shown in FIG. 5, the insulating film 300 is formed, and the first opening 310, the second opening 320, and the third opening 350 are formed by patterning by photolithography. The insulating film 300 may be made of photosensitive polyimide or the like, and a pattern may be formed by exposure and development.

  FIG. 7 is a schematic view showing a cross section of a substrate on which an organic EL layer is formed in the method for manufacturing a display device according to the first embodiment of the present invention. After the process shown in FIG. 6, oxygen plasma treatment is performed, and an organic EL layer 400 is formed in the display region 100 using a mask or the like. The organic EL layer 400 has a stacked structure of a plurality of organic layers. For example, the organic EL layer 400 has a stacked structure of “m-MTDATA”, “NPB”, “Blue EML”, and “Alq” from the lower layer to the upper layer. Note that “Blue EML” only needs to exist at least on the pixel electrode 110B, and thus may not be formed in other regions. That is, in the description of FIG. 7 and the like, the organic EL layer 400 is described with the same thickness in any region where the film is formed, but the thickness and the laminated structure may be different depending on the region.

  FIG. 8 is a schematic view showing a cross section of the substrate from which the organic EL layer between the end portions is removed in the method for manufacturing the display device according to the first embodiment of the present invention. After the process shown in FIG. 7, an AC voltage is applied between the auxiliary wiring 210 and the auxiliary wiring 220 via the voltage application unit 70. For example, when the frequency is 100 kHz and the effective applied voltage is about 100 to 300 Vrms, a discharge occurs in the end-to-end BW, and the organic EL layer 400 is removed as shown in FIG. At this time, at least a part of the end part 210T of the auxiliary wiring 210 and the end part 220T of the auxiliary wiring 220 is exposed, but a residue 450 of the organic EL layer 400 may remain in a part.

  In this example, when removing the organic EL layer 400 by discharge, a voltage is applied to all the auxiliary wirings 200 existing in the display region 100, and discharge is performed at all end-to-end BWs. However, a short circuit may be caused in the end-to-end BW due to the discharge generated in some end-to-end BW. In that case, it may be difficult to discharge in the end-to-end BW constituted by the same auxiliary wirings 210 and 220 as the end-to-end BW. Therefore, there is a case where the discharge is not necessarily performed at all the end-to-end BWs.

  When the upper electrode 500 is formed after the step shown in FIG. 8, the structure shown in FIG. 4 is obtained. In this example, the upper electrode has a laminated structure in which the lower layer is LiF and the upper layer is MgAg. In this example, the upper electrode 500 is used as the cathode of the organic EL layer 400. Note that the display device 1 further seals at least the display region 100 using a transparent sealing glass in a nitrogen atmosphere. At this time, the periphery of the substrate is surrounded by a UV curable resin or the like, and the inside is sealed.

  The distance between the end portions BW is desirably 5 μm or more and 100 μm or less in order to remove the organic EL film 400 and expose a part of the end portions 210T and 220T. When the distance between the end portions BW is less than 5 μm, in the case of a large-screen display device, it is difficult to accurately form a pattern, and there is a risk that a short-circuit portion is formed. On the other hand, if the distance between the end portions BW becomes too large, the conditions for causing discharge become severe, and it is necessary to increase the applied voltage. Therefore, the possibility of heat and electrical damage due to discharge to the TFT increases. End up. For this reason, there is a restriction on the layout, for example, it is necessary to further increase the distance between the pixel electrode 110 and the auxiliary wiring 200. Therefore, it is more desirable that the distance between the end portions BW is 20 μm or less.

  In addition, the smaller the electrical resistance of the connection portion between the auxiliary wiring 200 and the upper electrode 500, the more advantageous is the uniformity of screen luminance and the reduction of power consumption. For example, when one connection portion is formed for each pixel, considering the threshold voltage of the TFT of the pixel circuit, the voltage drop at the connection portion is 2 V or less in order to ensure the uniformity of screen luminance. It is desirable to suppress. In this case, the electrical resistance of the connection portion is desirably 200 kΩ or less in a high-luminance display in which the peak current of one pixel required for light emission of the organic EL layer is 100 μA. Further, it is more desirable that the voltage drop at the connection portion is suppressed to 0.5 V or less, that is, the electric resistance is 50 kΩ or less.

  Note that the number of connection portions may be one for a plurality of pixels instead of one for one pixel. For example, if there is one location for N pixels, in order to suppress the voltage drop at the connection portion to 2 V or less, the electrical resistance of the connection portion per location is 200 kΩ × (1 / N) or less. Preferably, the voltage drop is suppressed to 0.5 V or less, that is, the electric resistance is preferably 50 kΩ × (1 / N) or less.

  As described above, in the display device 1 according to the first embodiment of the present invention, the voltage is applied to the auxiliary wiring 200 before the upper electrode 500 is formed, and a discharge is generated in the end-to-end BW to generate the organic EL layer 400. Remove. Therefore, when the upper electrode 500 is formed, since at least a part of the end portion 210T and the end portion 220T is exposed, the upper electrode 500 and the auxiliary wiring 200 can be electrically connected.

  As described above, since the organic EL layer in the vicinity of the end-to-end BW can be electrically removed by electric discharge, there is no need to perform precise mask alignment, selective laser irradiation, or the like as in the prior art. Therefore, the process can be simplified. As a result, it is possible to improve the luminance distribution in the screen by suppressing the voltage drop of the upper electrode while suppressing an increase in the defect occurrence probability of the screen.

Second Embodiment
In the first embodiment, when the discharge is performed between the end portions BW, a voltage is applied to all the auxiliary wirings 200 in the display region 100, and the discharge is promoted in all the end portion BWs. In the second embodiment, the display area 100 is discharged in a plurality of parts.

  FIG. 9 is a diagram illustrating divided voltage application to the auxiliary wiring of the display device according to the second embodiment of the present invention. In display device 1A, the display area is divided into two areas, display areas 100A1 and 100A2. The display device 1 is provided with a voltage applying unit 70A1 for applying a voltage to the auxiliary wiring 200 in the display region 100A1, and a voltage applying unit 70A2 for applying a voltage to the auxiliary wiring 200 in the display region 100A2. If it does in this way, the increase in the electric current by processing a large area at a time can be suppressed, and generation | occurrence | production of the malfunction of the burning by an excessive electric current can be suppressed. Further, even when a short circuit occurs in some of the plurality of end-to-end portions BW due to the discharge in the display region 100A1, it is possible to prevent the discharge in the display region 100A2 from being affected.

<Third Embodiment>
In the first embodiment, the end 210T of the auxiliary wiring 210 and the end 220T of the auxiliary wiring 220 have a rectangular shape, but may have different shapes. In the third embodiment, two examples will be described as the shapes of the end portions 210T and 220T.

  FIG. 10 is a diagram illustrating a first example of the shape of the auxiliary wiring end portion according to the third embodiment of the present invention. In the first example shown in FIG. 10, both are triangular ends 210TB and 220TB. The distance between the end portion 210TB and the end portion 220TB is a distance between vertices.

  FIG. 11 is a diagram illustrating a second example of the shape of the auxiliary wiring end portion according to the third embodiment of the present invention. In the second example shown in FIG. 11, one end 210TB is the same as the first example, but the end 220TC has a rectangular shape. However, unlike the case of the first embodiment, it is wider than the line width of the auxiliary wiring 220. Note that the end portion 210TB may have the same shape as the end portion 220TC, or may have a shape in which the end portion 210TB and the end portion 220TC are interchanged.

[Example 1]
The electrical resistance (hereinafter referred to as contact resistance) of the connecting portion between the auxiliary wiring and the upper electrode was measured with a configuration similar to the configuration in the first embodiment.

  FIG. 12 is a diagram for explaining a layout of auxiliary wiring for contact resistance measurement. In this embodiment, two systems of auxiliary wirings BL1 and BL2 are assumed, and end-to-end BWs where the auxiliary wirings BL1 and BL2 face each other are provided corresponding to two sides of each pixel pix. In this figure, the pixels pix are arranged in 6 rows and 6 columns, but in the embodiment described below, pixels pix are arranged in 10 rows and 10 columns. The pixel pitch of the pixel pix was 318 μm.

  First, a pixel circuit was formed on the substrate with TFTs using low-temperature polysilicon, polyimide 2 μm was formed, and then a through hole for connection to the pixel electrode was formed. Then, pixel electrodes corresponding to the pixels pix and auxiliary wirings BL1 and BL2 were formed. The pixel electrode and the two electrically separated auxiliary wirings BL1 and BL2 are formed of a laminated electrode film having a lower layer made of a silver alloy (150 nm) and an upper layer made of ITO (20 nm). Subsequently, an insulating film was formed in which the ends facing the auxiliary wirings BL1 and BL2 and the BW between the ends were opened. The distance between the end portions BW was the same in every portion, and four types of experimental samples of 5 μm, 10 μm, 15 μm, and 20 μm were prepared. Note that the distance (closest portion) between the auxiliary wirings BL1 and BL2 and the pixel electrode is formed to be larger than 20 μm.

  After performing oxygen plasma treatment on the surface, an organic EL layer having a stacked structure of m-MTDATA (50 nm), NPB (70 nm), Blue EML (30 nm), and Alq (30 nm) was formed from the lower layer to the upper layer. . At this time, a mask was applied during the deposition of each layer so that the organic EL layer was not formed on the energization pad portions of the auxiliary wirings BL1 and BL2.

  Then, an alternating voltage was applied from the energizing pad portion to the two systems of auxiliary wirings BL1 and BL2 using an alternating current power supply AG in a nitrogen atmosphere. This alternating voltage was performed in the range of a frequency of 100 kHz and an effective applied voltage of 100 V to 300 Vrms. Discharge occurred in the end-to-end BW due to the application of the AC voltage, and the organic EL layer was removed in the vicinity of one or more end-to-end BW.

  Thereafter, an upper electrode was formed so as to cover the auxiliary wirings BL1 and BL2 around the pixel pix, and the region including the pixel pix and its periphery was sealed with a glass substrate. In the upper electrode, the lower layer was LiF (1 nm), and the upper layer was MgAg (Mg: Ag = 10: 1) (15 nm). Note that the upper electrode and the cathode power supply are indirectly connected via an auxiliary wiring.

  When the organic EL display thus produced was driven, the driving voltage was 7.4 A and the light emission efficiency was 4.5 cd / A at a current of 3 mA under any conditions. Moreover, when the electrical resistance of the connection part was measured, the average per location was 133 (ohm).

[Comparative Example 1]
The upper electrode and the cathode power source are not indirectly connected via the auxiliary wiring, but the upper electrode and the cathode power source are directly connected. A. Therefore, as in Example 1 above, the upper electrode and the auxiliary wiring are connected in the portion where the organic EL layer is removed, and the upper electrode and the cathode power source are indirectly connected through the auxiliary wiring. However, it does not significantly affect the light emission of the organic EL layer, that is, the electrical resistance of the contact portion between the upper electrode and the auxiliary electrode in Example 1 can be realized as a resistance that does not cause a problem with the light emission of the organic EL layer. It was confirmed that

[Comparative Example 2]
When the organic EL layer was not removed by discharge in Example 1, the electrical resistance of the connection portion was not less than the measurement limit (1 GΩ). Although the upper electrode and the cathode power source are indirectly connected through an auxiliary wiring, the resistance of the connection portion is higher than the measurement limit, so that no current flows and the organic EL layer cannot be lit.

DESCRIPTION OF SYMBOLS 1 ... Display apparatus, 10 ... Board | substrate, 70 ... Voltage application part, 71, 72, 73, 74 ... Drive circuit, 100 ... Display area, 110, 110B, 110G, 100R ... Pixel electrode, 210, 220 ... Auxiliary wiring, 210T , 220T ... end, 250 ... power connection electrode, 300 ... insulating layer, 310 ... first opening, 320 ... second opening, 350 ... third opening, 400 ... organic EL layer, 450 ... residue, 500 ... Upper electrode, 1000 ... Substrate

Claims (5)

A display device having a plurality of pixels,
A pixel electrode provided corresponding to the pixel;
A plurality of auxiliary wirings including a first auxiliary wiring having a first end and a second auxiliary wiring having a second end, wherein at least part of the plurality of pixel electrodes, An auxiliary wiring in which the first end and the second end are opposed to each other at a distance shorter than a distance from the pixel electrode;
A first opening that exposes a part of the pixel electrode; a first end; the second end; and a second opening that exposes a gap between the first end, the pixel electrode, and the auxiliary wiring. An insulating layer disposed on top;
An organic light emitting layer disposed on the pixel electrode and the insulating layer exposed by the first opening;
A conductive layer including an electrode disposed on the organic light emitting layer on the pixel electrode, and a connection portion that electrically connects the auxiliary wiring and the electrode in the second opening;
A display device comprising:   The display device according to claim 1, wherein a distance between the end portions is 5 μm to 100 μm. There are a plurality of connecting portions between the auxiliary wiring and the conductive layer electrically connected in the second opening,
The display device according to claim 1, wherein the plurality of connection portions include connection portions having a connection resistance of 200 kΩ or less. A power connection electrode to which power for causing the organic light emitting layer to emit light is supplied;
4. The power supply connection electrode according to claim 1, wherein the conductive layer is connected to the auxiliary wiring and indirectly connected to the auxiliary wiring via the conductive layer. 5. Display device. A method of manufacturing a display device having a pixel electrode corresponding to a plurality of pixels,
A plurality of auxiliary wirings including a first auxiliary wiring having a first end and a second auxiliary wiring having a second end, wherein at least part of the plurality of pixel electrodes, Forming an auxiliary wiring in which the first end and the second end face each other at a distance shorter than a distance from the pixel electrode;
An insulating layer having a first opening exposing a part of the pixel electrode, the first end, the second end, and a second opening exposing between the ends, the pixel electrode and Formed on the auxiliary wiring,
Forming an organic light emitting layer on the pixel electrode exposed by the first opening, the auxiliary wiring exposed by the second opening, and the insulating layer;
A voltage is applied between the first auxiliary wiring and the second auxiliary wiring to cause a discharge between the end portions, so that at least a part of the auxiliary wiring exposed in the second opening is exposed. To remove the organic light emitting layer,
Forming an electrode disposed on the organic light emitting layer on the pixel electrode, and a conductive layer including a connection portion that electrically connects the electrode to the auxiliary wiring exposed in the second opening;
A method for manufacturing a display device, comprising:

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