Patent Publication Number: US-10312476-B2

Title: Display device

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. patent application Ser. No. 15/287,111, filed on Oct. 6, 2016. Further, this application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2016-000096 filed on Jan. 4, 2016,the entire contents of which are incorporated herein by reference. 
    
    
     FIELD 
     The present invention relates to a display device including a plurality of pixels and a method of manufacturing the same, and specifically to a display device including a light emitting element including an organic light emitting layer in each of the plurality of pixels, and a method of manufacturing the same. 
     BACKGROUND 
     Conventionally, LCDs (Liquid Crystal Displays) and OLED (Organic Light Emitting Diode) displays are manufactured as follows. A plurality of displays are manufactured at the same time on a large glass substrate, and then the glass substrate is cut and separated into the plurality of displays individually. In general, the glass substrate is cut by a method using a scribe cutter or a method using laser light irradiation. 
     An LCD and an OLED display are each generally have a structure including two glass substrates bonded together. In the above-described cutting step, the two glass substrates are cut together. However, in the state where the two glass substrates are cut in this manner, terminal portions on one of the two glass substrate, namely, an array substrate having a display circuit and the like formed thereon, are covered with the other glass substrate. Therefore, generally, after the two glass substrates are cut together, another step of cutting only the glass substrate not having the terminal portions thereon to expose the terminal portions is performed. 
     Examples of known technologies for selectively cutting only one of the two substrates bonded together are descried in Japanese Laid-Open Patent Publications Nos. 2004-126054 and 2009-98425. According to the technologies disclosed in these publications, each of liquid crystal display devices individually separated is irradiated with laser light to cut a part of one of the two substrates, namely, a counter substrate, to expose the terminal portion on the other substrate, namely, the array substrate. Both of the publications disclose a technology for providing a metal film below a position along which the counter substrate is to be cut, so that the laser light does not hit the array substrate, which is formed of glass. 
     With the technologies disclosed in the above-mentioned two publications, the step of exposing the terminal portion needs to be performed after the glass substrates are separated into the individual liquid crystal display devices. Namely, the step of laser light irradiation needs to be performed on individual liquid crystal display devices separated from each other from the state of being provided between the large glass substrates. This is a factor decreasing the throughput in the mass-production of the liquid crystal display devices. 
     SUMMARY 
     A method of manufacturing a display device in an embodiment according to the present invention includes forming a first resin layer on a first substrate; forming a plurality of regions on the first resin layer, the plurality of regions each including a display portion, a terminal portion and a light blocking layer located between the display portion and the terminal portion; forming a second resin layer on a second substrate; bonding the first substrate and the second substrate such that the first resin layer and the second resin layer face each other; directing first laser light along a first line and a second line enclosing the plurality of regions such that the first laser light is transmitted through the second substrate to irradiate the first resin layer and the second resin layer with the first laser light; and directing second laser light along a third line parallel to the light blocking layer such that the second laser light is transmitted through the second substrate to irradiate the light blocking layer and the second resin layer with the second laser light. 
     A display device in an embodiment according to the present invention includes a first resin layer including a display portion, a terminal portion electrically connected with the display portion, and a light blocking layer located between the display portion and the terminal portion, the display portion including a light emitting element including a positive electrode, a light emitting layer and a negative electrode, and the light emitting layer forming the same layer as the positive electrode; and a second resin layer bonded to the first resin layer so as to face the first resin layer. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  schematically shows a structure of an organic EL display device in embodiment 1; 
         FIG. 2  is a cross-sectional view showing the structure of the organic EL display device in embodiment 1; 
         FIG. 3  is a plan view showing the structure of the organic EL display device in embodiment 1; 
         FIG. 4A  is a cross-sectional view showing a step of a method of manufacturing the organic EL display device in embodiment 1; 
         FIG. 4B  is a cross-sectional view showing a step of the method of manufacturing the organic EL display device in embodiment 1; 
         FIG. 5A  is a cross-sectional view showing a step of the method of manufacturing the organic EL display device in embodiment 1; 
         FIG. 5B  is a cross-sectional view showing a step of the method of manufacturing the organic EL display device in embodiment 1; 
         FIG. 6  is a cross-sectional view showing a step of the method of manufacturing the organic EL display device in embodiment 1; 
         FIG. 7  is a cross-sectional view showing a step of the method of manufacturing the organic EL display device in embodiment 1; 
         FIG. 8  is a plan view showing the step, shown in  FIG. 7 , of the method of manufacturing the organic EL display device in embodiment 1; 
         FIG. 9  is a cross-sectional view showing a step of the method of manufacturing the organic EL display device in embodiment 1; 
         FIG. 10  is a plan view showing the step, shown in  FIG. 9 , of the method of manufacturing the organic EL display device in embodiment 1; 
         FIG. 11  is a cross-sectional view showing a step of the method of manufacturing the organic EL display device in embodiment 1; 
         FIG. 12  is a cross-sectional view showing a step of the method of manufacturing the organic EL display device in embodiment 1; 
         FIG. 13  is a cross-sectional view showing a step of the method of manufacturing the organic EL display device in embodiment 1; 
         FIG. 14  is a cross-sectional view showing a step of the method of manufacturing the organic EL display device in embodiment 1; 
         FIG. 15  is a cross-sectional view showing a step of the method of manufacturing the organic EL display device in embodiment 1; and 
         FIG. 16  is a cross-sectional view showing a structure of an organic EL display device in embodiment 2. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     The present invention has an object of providing a simple method of manufacturing a display device having a high throughput, and a display device manufactured by such a method. 
     Hereinafter, embodiments of the present invention will be described with reference to the drawings and the like. The present invention may be carried out in various other embodiments without departing from the gist thereof, and should not be construed as being limited to any of the following embodiments. 
     In the drawings, components may be shown schematically regarding the width, thickness, shape and the like, instead of being shown in accordance with the actual sizes, for the sake of clear illustration. The drawings are merely exemplary and do not limit the interpretations of the present invention in any way. In the specification and the drawings, components that are substantially the same as those shown in a previous drawing(s) bear the identical reference signs thereto, and overlapping descriptions thereof may be omitted. 
     In this specification and the claims, an expression that a component or area is “on” another component or area encompasses a case where such a component or area is in contact with the another component or area and also a case where such a component or area is above or below the another component or area, namely, a case where still another component or area is provided between such a component or area and the another component or area, unless otherwise specified. 
     (Embodiment 1) 
     &lt;Structure of the Display Device&gt; 
       FIG. 1  schematically shows a structure of an organic EL display device  10  in embodiment 1. The organic EL display device  10  includes a first resin layer  101 , a display portion (display region)  102  provided on the first resin layer  101 , a terminal portion  103  provided on the first resin layer  101  and supplying an external signal to the display portion  102 , a light blocking layer  104  located between the display portion  102  and the terminal portion  103 , and a second resin layer  105  located to face the first resin layer  101 . The display portion  102  includes a plurality of pixels  102   a  located therein. The light blocking layer  104  has a role described below. 
     Although not shown in  FIG. 1 , the first resin layer  101  may have various circuits such as a gate driver circuit, a source driver circuit, a logic circuit and the like provided thereon in addition to the display portion  102 . The various circuits may be formed of thin film transistors in the same step as the display portion  102 , or may be provided as external integrated circuits. 
       FIG. 2  shows a cross-sectional structure of the organic EL display device  10  in embodiment 1. As described above, the display portion  102  and the terminal portion  103  are provided on the first resin layer  101 . The display portion  102  and the terminal portion  103  are connected with each other via a plurality of lines  106 . The lines  106  have a role of transmitting a signal to the plurality of pixels  102   a  included in the display portion  102 , and are usually formed of a metal material. 
     As shown in  FIG. 1 , the display portion  102  includes the plurality of pixels  102   a . Each of the pixels  102   a  includes a plurality of thin film transistors forming a pixel circuit. The structure and the location of each pixel  102   a  are of a known technology. The above-described lines  106  may be formed in the same step as electrodes or lines electrically connected with the thin film transistors. 
     As shown in  FIG. 2 , the display portion  102  includes an insulating layer  107  acting as a flattening layer. The insulating layer  107  may be formed of a resin such as polyimide, acrylic resin or the like or a siloxane-based inorganic insulating material. In the organic EL display device  10  in this embodiment, the insulating layer  107  is provided in the display portion  102  and also in a portion between the display portion  102  and the terminal portion  103 . A reason for this will be described below. It is preferable that the insulating layer  107  is not provided on the terminal portion  103  because the terminal portion  103  is exposed in the organic EL display device  10  as a finished product. 
     In the display portion  102 , a positive electrode  108 , an organic EL layer  109  including a light emitting layer, and a negative electrode  110  are provided on the insulating layer  107 . An organic EL element  111  as the light emitting element includes the positive electrode  108 , the organic EL layer  109  and the negative electrode  110 . A region enclosed by a bank  112  formed of an insulating material acts as the pixel  102   a . The positive electrode  108  acts as a pixel electrode located in each of the plurality of pixels  102   a . The negative electrode  110  is an electrode common to all the plurality of pixels  102   a , and is provided in the entirety of the display portion  102 . 
     Basically, the positive electrode  108 , the organic EL layer  109  and the negative electrode  110  have a structure provided by a known technology. It is preferable that the positive electrode  108  partially contain a metal material. In the organic EL display device  10  in this embodiment, the positive electrode  108  is formed of a stacked film including a transparent conductive layer formed of ITO (indium-tin-oxide) or the like and a metal layer formed of silver or the like. More specifically, the positive electrode  108  has a structure including two transparent conductive layers and a metal layer sandwiched between the two transparent conductive layers. 
     In the organic EL display device  10  in this embodiment, the light blocking layer  104  is formed in the same step as the positive electrode  108 . Therefore, the light blocking layer  104  may have the same layer structure as that of the positive electrode  108 . In this embodiment, the light blocking layer  104  may have, for example, a structure including two transparent conductive layers and a metal layer sandwiched between the two transparent conductive layers. Needless to say, the light blocking layer  104  does not need to have completely the same layer structure as that of the positive electrode  108 , but may have a part of the structure of the positive electrode  108 . It should be noted that the light blocking layer  104  needs to include a metal layer having a light blocking property. In this embodiment, the metal layer formed of silver or the like included in the positive electrode  108  acts as a metal layer having a light blocking property. 
     As described above, the insulating layer  107  needs to be provided below a position where the light blocking layer  104  is to be provided.  FIG. 3  shows a structure of the organic EL display device  10  in this embodiment as seen in a plan view.  FIG. 3  does not show the second resin layer  105 . 
     As described above, the display portion  102  and the terminal portion  103  are connected with each other via the plurality of lines  106 . Therefore, the light blocking layer  104  cross the plurality of lines  106 . For this reason, it is preferable that the light blocking layer  104  and the plurality of lines  106  are insulated from each other. In order to realize this, the organic EL display device  10  in this embodiment, as shown in  FIG. 2 , includes the insulating layer  107  below the light blocking layer  104  to insulate the light blocking layer  104  and the lines  106  from each other. 
     As described above, in the organic EL display device  10  in this embodiment, a part of the metal material used for the positive electrode  108  included in the organic EL element  111  is used to form the light blocking layer  104 . A conductive layer located below the insulating layer  107  is used to form the lines  106 . Because of such a structure, the light blocking layer  104  and the lines  106  are insulated from each other without any specific step being added. In the case where the insulating layer  107  is formed of a material having a low dielectric constant (e.g., resin material), a capacitance formed between the light blocking layer  104  and the lines  106  is small. 
     Still referring to  FIG. 2 , the organic EL element  111  is covered with a protective layer  113 . The protective layer  113  may be formed of, for example, silicon nitride, but is not limited to being formed of silicon nitride. The protective layer  113  is provided to cover the entirety of the first resin layer  101  and then is partially etched away as described below. Specifically, a part of the protective layer  113  that corresponds to a region where the first resin layer  101  and the second resin layer  105  do not overlap each other as seen in a plan view (corresponding to a region including the terminal portion  103 ) is selectively removed. As described below, such a step of removal may be performed by etching by use of the second resin layer  105  as a mask. 
     The second resin layer  105  has color filters  114  and a black mask (light blocking layer)  115  formed thereon. Neither the color filters  114  nor the black mask  115  is indispensable, and the color filters  114  or the black mask  115  may be omitted appropriately. For example, in the organic EL display device  10  in this embodiment, the color filters  114  are provided because the organic EL layer  109  is formed of a white organic EL layer. In the case where organic EL layers that emit light of different colors are provided in different pixels, the color filters  114  may be omitted. Needless to say, even in such a case, the color filters  114  of colors corresponding to the colors of the light emitted by the respective organic EL layers may be provided in order to improve the color purity. The color filters  114  and the black mask  115  may each be formed of a known material. 
     The first resin layer  101  and the second resin layer  105  are bonded together with a sealing member  116 . In the organic EL display device  10  in this embodiment, the sealing member  116  is formed of a resin material. The sealing member  116  may be formed of any other known material. In this example, the first resin layer  101  and the second resin layer  105  are bonded together with the sealing member  116 . Alternatively, the sealing member  116  may be omitted. For example, the protective layer  113  may be formed of a resin material, which may also be used to bond the first resin layer  101  and the second resin layer  105 . 
     &lt;Method of Manufacturing the Display Device  10 &gt; 
     Hereinafter, with reference to  FIG. 4  through  FIG. 15 , a method of manufacturing the organic EL display device  10  in embodiment 1 having the above-described structure will be described. 
     First, with reference to  FIG. 4A  and  FIG. 4B , a step of manufacturing an array substrate including the display portion  102  (substrate including a pixel array including the plurality of pixels), among the elements of the organic EL display device  10 , will be described. As shown in  FIG. 4A , a first resin layer  32  is formed on a first substrate  31 . The first substrate  31  may be formed of any appropriate material. In this embodiment, the first substrate  31  is formed of glass. In this embodiment, the first resin layer  32  is formed of a polyimide resin, and has a thickness of 10 to 30 μm (typically, 20 μm). The first resin layer  32  may be formed of any other resin such as an acrylic resin or the like instead of polyimide. 
     Next, a display portion  33  and a terminal portion  34  are formed on the first resin layer  32 . Specifically, for forming the display portion  33 , thin film transistors (not shown) are formed by a known method to form a plurality of pixel circuits. In this embodiment, in the step of forming the display portion  33 , lines  35  are formed of a metal material such as aluminum or the like. As shown in  FIG. 3 , ends of the lines  35  (in  FIG. 3 , the lines  106 ) are assembled together to form the terminal portion  34  (in  FIG. 3 , the terminal portion  103 ). After the thin film transistors are formed, an insulating layer  36  is formed to cover the thin film transistors. In this embodiment, as described above with reference to  FIG. 2  and  FIG. 3 , the insulating layer  36  (in  FIG. 2 , the insulating layer  107 ) is formed even in a region below a region where a light blocking layer  38  (in  FIG. 2 , the light blocking layer  104 ) is to be formed later. 
     Next, as shown in  FIG. 4B , an organic EL element  37  is formed on the insulating layer  36 .  FIG. 4B  shows one organic EL element  37 , but in actuality, an organic EL element  37  is formed in each of the pixels. As described above with reference to  FIG. 2 , the organic EL element  37  (in  FIG. 2 , the organic EL element  111 ) includes a positive electrode, an organic EL layer and a negative electrode. 
     In this embodiment, the light blocking layer  38  is formed in the same step as, and of the same materials as, the positive electrode in the organic EL element  37 . Specifically, the positive electrode and the light blocking layer  38  having a structure including two transparent conductive layers formed of ITO and a metal layer formed of silver that is sandwiched between the two transparent conductive layers are formed. Needless to say, the light blocking layer  38  is not limited to having the above-described structure, but may have any other structure as long as including a metal layer having a light blocking property. A specific role of the light blocking layer  38  will be described below. 
     After the organic EL layer  37  is formed, a protective layer  39  is formed to cover the entirety of the first substrate  31 . In this embodiment, the protective layer  39  is formed of silicon nitride. At this point, the array substrate including the display portion  33 , among the elements of the organic EL display device  10 , is manufactured.  FIG. 4A  and  FIG. 4B  each show a region corresponding to one array substrate. In actuality, a plurality of such regions are formed on the first substrate  31 , which is large-sized. Namely, a plurality of regions each including the display portion  33 , the terminal portion  34 , and the light blocking layer  38  located between the display portion  33  and the terminal portion  34  are formed on the first substrate  31 . 
     Next, with reference to  FIG. 5A  and  FIG. 5B , a step of manufacturing, among the elements of the organic EL display device  10 , a counter substrate facing the array substrate will be described. 
     As shown in  FIG. 5A , a second resin layer  42  is formed on a second substrate  41 . The second substrate  41  may be formed of a transparent material such as glass, quartz or the like. In this embodiment, the second substrate  41  is formed of glass, like the first substrate  31 . In this embodiment, the second resin layer  42  is formed of a polyimide resin, and has a thickness of 10 to 30 μm (typically, 20 μm). The second resin layer  42  may be formed of any other resin such as an acrylic resin or the like instead of polyimide. 
     Next, as shown in  FIG. 5B , a color filter  43  and a black mask  44  are formed on the second resin layer  42 . In this embodiment, the color filter  43  and the black mask  44  are formed. Either one of, or both of, the color filter  43  and the black mask  44  may be omitted. 
     In  FIG. 5B , the color filter  43  is shown as being formed in one region. In actuality, a plurality of types of color filters  43  transmitting light of wavelengths corresponding to the colors of the light emitted in the respective pixels are formed. The black mask  44  may be formed of a metal material such as chromium or the like, or a resin material containing a black pigment dispersed therein. The color filter  43  and the black mask  44  may each have a structure provided by a known technology. 
     At this point, among the elements of the organic EL display device  10 , the counter substrate to be located to face the array substrate is manufactured.  FIG. 5A  and  FIG. 5B  each show a region corresponding to one counter substrate. In actuality, a plurality of such regions are formed on the second substrate  41 , which is large-sized. Namely, a plurality of regions each including the color filter  34  and the black mask  44  are formed on the second substrate  41 . 
     Next, as shown in  FIG. 6 , the array substrate (represented by reference sign  51 ) manufactured by the steps shown in  FIG. 4A  and  FIG. 4B , and the counter substrate (represented by reference sign  52 ) manufactured by the steps shown in  FIG. 5A  and  FIG. 5B , are bonded together with a sealing member  45 . Thus, a plurality of the organic EL display devices  10  are manufactured in the state of being provided between the first and second substrates  31  and  41 . 
     After the array substrate  51  and the counter substrate  52  are bonded together, as shown in  FIG. 7  and  FIG. 8 , the assembly of the array substrate  51  and the counter substrate  52  is separated into the plurality of individual organic EL display devices  10  by use of first laser light  61 .  FIG. 7  is a cross-sectional view and  FIG. 8  is a plan view both showing how the assembly of the array substrate  51  and the counter substrate  52  is irradiated with the first laser light  61 . 
     As shown in  FIG. 7 , in this embodiment, the assembly of the array substrate  51  and the counter substrate  52  is irradiated with the first laser light  61  directed toward the second substrate  41  formed of glass. The second resin layer  42 , the protective layer  39 , the lines  35  and the first resin layer  32  are cut by the first laser light  61  transmitted through the second substrate  41 . In this example, the first laser light  61  is directed toward the second substrate  41 . Alternatively, the first laser light  61  may be directed toward the first substrate  31  as long as the first substrate  31  is transparent. 
     The first laser light  61  may be, for example, excimer laser light, but is not limited to this. The wavelength and the power of the first laser light  61  may be appropriately selected in consideration of various parameters including the material of each of the first substrate  31  and the second substrate  41 , the materials of the elements to be cut, the heat-resistant temperature of each of the first resin layer  32  and the second resin layer  42 , and the like. 
     As shown in  FIG. 8 , the first laser light  61  is directed along first lines  62  and second lines  63  enclosing regions  71  each including the display portion  33 , the terminal portion  34  and the light blocking layer  38  (regions enclosed by the chain lines). Namely, the first laser light  61  is directed along the first lines  62  and the second lines  63  crossing each other. As a result, the regions  71  are separated from each other (it should be noted that in the state shown in  FIG. 8 , the regions  71  are still continuous to each other by the first substrate  31  and the second substrate  32 ). 
     Next, as shown in  FIG. 9  and  FIG. 10 , the second resin layer  42  is selectively cut by second laser light  64 .  FIG. 9  is a cross-sectional view and  FIG. 10  is a plan view both showing how the assembly of the array substrate  51  and the counter substrate  52  is irradiated with the second laser light  64 . 
     As shown in  FIG. 9 , in this embodiment, the assembly of the array substrate  51  and the counter substrate  52  is irradiated with the second laser light  64  directed toward the second substrate  41  formed of glass. In this embodiment, the second laser light  64  is blocked by the light blocking layer  38  in this step. Therefore, the second laser light  64  does not influence any of the insulating layer  36 , the lines  35  and the first resin layer  32  located below the light blocking layer  38 . For this reason, the second resin layer  42  is selectively cut by the second laser light  64  transmitted through the second substrate  41 . Thus, it is preferable that the second laser light  64  has a spot diameter (diameter of an area to be irradiated with the second laser light  64 ) that is less than, or equal to, a line width of the light blocking layer  38 . For example, in the case where the spot diameter of the second laser light  64  is 10 μm, the line width of the light blocking layer  38  may be 15 to 30 μm (preferably, 20 to 25 μm). 
     The second laser light  64  may be, for example, excimer laser light, but is not limited to this. The wavelength and the power of the second laser light  64  may be appropriately selected in consideration of various parameters including the material of the second substrate  41 , the material of the second resin layer  42 , the heat-resistant temperature of the second resin layer  42 , and the like. 
     As shown in  FIG. 10 , the second laser light  64  is directed along third lines  65  parallel to the light blocking layers  38 . In this manner, the second resin layer  42  is cut along lines crossing regions between the display portions  33  and the terminal portions  34 . 
     In the manner described above, the step of cutting the first resin layer  32  and the second resin layer  42  by use of the first laser light  61 , and the step of cutting the second resin layer  42  by use of the second laser light  64 , are finished. In this embodiment, the step of cutting by use of the first laser light  61  and the step of cutting by use of the second resin layer  42  may be performed in an opposite order. 
     Next, as shown in  FIG. 11 , the assembly of the array substrate  51  and the counter substrate  52  is irradiated with third laser light  66  directed toward the second substrate  41  in the state where a light blocking mask  73  is provided on the second substrate  41 . In this step, a part of an interface between the second substrate  41  and the second resin layer  42  is selectively supplied with energy by the third laser light  66 , which has power lower than that of each of the first laser light  61  and the second laser light  64 . As a result, the adhesiveness between the second substrate  41  and the second resin layer  42  at the part of the interface is decreased. 
     Then, as shown in  FIG. 12 , the second substrate  41  is removed. In the part irradiated with the third laser light  66 , the second resin layer  42  is peeled off from the second substrate  41 . As a result, the second resin layer  42  is left above the first substrate  31 . By contrast, in the part not irradiated with the third laser light  66 , the second resin layer  42  is removed together with the second substrate  41 . In this manner, mere removal of the second substrate  41  results in a part of the second resin layer  42  that is in the region above the terminal portion  34  is selectively removed. 
     Next, the protective layer  39  is etched in a self-aligned manner by use of the second resin layer  42  as a mask, so that as shown in  FIG. 13 , a part of the line  35  is exposed. Thus, the terminal portion  34  is exposed. Namely, exposure of the terminal portion  34  of the organic EL display device  10  is finished. It is preferable that the etching performed on the protective layer  39  is dry etching. A reason for this is that the etching is performed after the organic EL element  37  is formed and thus it is preferable to avoid, as much as possible, the organic EL element  37  from being exposed to moisture. In this embodiment, the protective layer  39  is formed of silicon nitride. Therefore, the dry etching on the protective layer  39  may be performed by use of, for example, a known gas material such as CF 4  (carbon fluoride) gas or the like. 
     In this embodiment, as described above with reference to  FIG. 9 , the second resin layer  42  is cut above the light blocking layer  38 . Therefore, when the dry etching is performed by use of the second resin layer  42  as a mask, at least a part of the light blocking layer  38  is exposed. However, in this embodiment, the light blocking layer  38  is of the same layer structure as the positive electrode included in the organic EL element  37 . Therefore, the light blocking layer  38  includes an uppermost layer formed of a transparent conductive material such as ITO or the like. This provides an advantage that even in the case where the light blocking layer  38  includes a metal layer containing silver, aluminum or the like having a light blocking property, such a metal layer is not exposed, and the problem of corrosion or the like is minimized. 
     Next, as shown in  FIG. 14 , the resultant assembly is irradiated with fourth laser light  67  directed toward the entirety of the first substrate  31 . In this step, like in the step described above with reference to  FIG. 11 , an interface between the first substrate  31  and the first resin layer  32  is supplied with energy by the fourth laser light  67 , which has power lower than that of each of the first laser light  61  and the second laser light  64 . As a result, the adhesiveness between the first substrate  31  and the first resin layer  32  at the interface is decreased. Then, the first substrate  31  is peeled off from the first resin layer  32  and thus is removed. As a result, the organic EL display device  10  shown in  FIG. 15  is manufactured. 
     As described above, in this embodiment, an element used for the positive electrode included in the organic EL element  37  is used for the light blocking layer  38 , and thus a part of the second resin layer  42  that is in the region above the terminal portion  34  is selectively removed without any step being added to the method of manufacturing the organic EL display device  10 . Before the first substrate  31  and the second substrate  32  are removed, the step of cutting the first resin layer  32  and the second resin layer  42  is finished. Therefore, mere removal of the second substrate  41  results in the organic EL display devices  10  being separated from each other and also results in a part of the second resin layer  42  that is in the region above the terminal portion  34  being removed. Namely, the terminal portions  34  are exposed in the same step in all the organic EL display devices  10 . Thus, a simple method of manufacturing a display device having a high throughput is provided. 
     (Embodiment 2) 
       FIG. 16  shows a cross-sectional structure of an organic EL display device  20  in embodiment 2. Unlike in embodiment 1, in the organic EL display device  20  in embodiment 2, the insulating layer is left below the sealing member without being etched away and the light blocking layer is located also below the sealing member. 
     As shown in  FIG. 16 , an insulating layer  81  is selectively etched so as to be removed from the region where the terminal portion  103  is to be formed but so as to be left in the display portion  102  and in a region below a region where the sealing member  116  is to be formed. Such a structure decreases the amount of the material of the sealing member  116  and thus decreases the manufacturing cost. 
     In this embodiment, a light blocking layer  82  is located also below the sealing member  116 . Such a structure allows the light blocking layer  82  to act as an etching stopper and thus to suppress etching gas used for the protective layer  113  and the laser light from entering the display portion  102 . Especially, this structure prevents the inconvenience that the insulating layer  81  located below the sealing member  116  from being etched away. 
     The organic EL display device  20  in this embodiment may be manufactured by a method similar to the manufacturing method in embodiment 1, and the method of manufacturing the organic EL display device  20  provides effects similar to those of embodiment 1 described above. 
     The above-described embodiments according to the present invention may be appropriately combined together as long as no contradiction occurs. Any embodiment obtained as a result of any addition, deletion, or design change of an element or any addition, deletion or condition change of a step being performed appropriately by a person of ordinary skill in the art with respect to any of the above-described embodiments is encompassed in the scope of the present invention as long as including the gist of the present invention. 
     Even a function or effect other than the function or effect provided by the above-described embodiments but is apparent from the description of this specification or would have been obvious to a person of ordinary skill in the art is construed as being provided by the present invention.