Abstract:
An display device comprising a plurality of pixel define units is disclosed. Each pixel define unit comprises patterned pixel define sections, a first electrode layer, an emission layer and a second electrode layer. The patterned pixel define section has a first lateral surface and a second lateral surface opposite to the first lateral surface. The first electrode layer comprises a first sub-electrode and a second sub-electrode. The first and second sub-electrodes are spaced apart from each other and respectively disposed on the first and second lateral surfaces. The emission layer is disposed on the first electrode layer. The second electrode layer is disposed on the emission layer.

Description:
[0001]    This application claims the benefit of Taiwan application Serial No. 101107973, filed Mar. 8, 2012, the subject matter of which is incorporated herein by reference. 
       BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    The invention is related to a display device and method for manufacturing the same, and more particularly to a display device having pixel define units and method for manufacturing the same. 
         [0004]    2. Description of the Related Art 
         [0005]    The light emitting mechanism of an organic light emitting diode (OLED) displayer is electroluminescent mechanism. Because the OLED displayer has lots of advantages such as wide viewing angle, short response time, high luminescence efficiency, low operating voltage, thin panel thickness, can be produced by simple manufacturing process and can be manufactured into large scale panel as well as flexible panel, OLED displayer has developed to be one of the mainstream displayers in market. 
         [0006]    OLED displayer has a three-layer structure which includes a cathode electrode, an anode electrode and an organic material sandwiched between the cathode electrode and the anode electrode. When an electric field being applied to the cathode and the anode electrodes, electrons and electron holes flow into the organic materials respectively and incorporate with each other to form excitons. The exciton-forming process will radiate light during energy releasing procedure. 
         [0007]    However, the mismatch of refractive index between the organic material layer and the two side layers adjacent to the organic material layer trend to induce waveguide effect. Therefore, some of the light generated by the organic material would be totally reflected at the boundaries between the organic material layer as well as the two side layers and incapable to emit light to outside, thereby reducing the luminous efficiency. 
       SUMMARY OF THE INVENTION 
       [0008]    The invention is directed to a display device having a plurality of pixel define units. By utilizing the specific first electrode layer of the pixel define units, light totally reflected in the emission layer and incapable to emit to outside can be reflected. Besides, the specific structure of the first electrode layer can be used to improve the contact area between the first electrode layer and the second electrode layer to improve the luminous efficiency. 
         [0009]    According to a first aspect of the present invention, a display device comprising a first substrate, a second substrate opposite to the first substrate, a plurality of light emitting pixel units and a plurality of pixel define units disposed between the first substrate and the second substrate is disclosed. Each of the pixel define units comprises patterned pixel define sections, a first electrode layer, a emission layer and a second electrode layer. The patterned pixel define section has a first lateral surface and a second lateral surface opposite to the first lateral surface. The first electrode layer comprises a first sub-electrode and a second sub-electrode, the first sub-electrode is disposed on the first lateral surface and the second sub-electrode is disposed on the second lateral surface. The first sub-electrode and the second sub-electrode are spaced apart. The emission layer is disposed on the first electrode layer. The second electrode layer is disposed on the emission layer. 
         [0010]    According to a second aspect of the present invention, a method for manufacturing a display device is disclosed. The method comprises following steps. A first substrate is provided. A plurality of patterned pixel define sections are formed on the first substrate. A first electrode layer is formed on the substrate and the patterned pixel define section. The first electrode layer comprises a first sub-electrode and a second sub-electrode. The first sub-electrode and the second sub-electrodes are spaced apart from each other. A emission layer is form on the first electrode layer. A second electrode layer is formed on the emission layer. A second substrate is provided and the second substrate is opposite to the first substrate. 
         [0011]    The above and other aspects of the invention will become better understood with regard to the following detailed description of the preferred but non-limiting embodiment(s). The following description is made with reference to the accompanying drawings. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0012]      FIG. 1A˜1H  illustrate manufacturing processes of a cross section view of a display device according to one embodiment of the invention. 
           [0013]      FIG. 2A  illustrates a display device according to an embodiment of the invention. 
           [0014]      FIG. 2B  illustrates a display device according to another embodiment to the invention. 
           [0015]      FIG. 3  illustrates a display device according to still another embodiment of the invention. 
           [0016]      FIG. 4  illustrates a display device according to still another one embodiment of the invention. 
           [0017]      FIG. 5  illustrates a display device according to still another one embodiment of the invention. 
           [0018]      FIG. 6  illustrates a display device according to still another one embodiment of the invention. 
           [0019]      FIG. 7  illustrates a display device according to still another one embodiment of the invention. 
           [0020]      FIG. 8  illustrates a display device according to still another one embodiment of the invention. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0021]      FIG. 1A˜1H  illustrate manufacturing processes of display device  1  according to an embodiment of the invention. As shown in  FIG. 1A , a first substrate  10  is provided. A pixel define layer  102  is formed on the first substrate  10 . In  FIG. 1B , pixel define layer  102  (shown in  FIG. 1A ) is patterned to form patterned pixel define sections  102 ′. In this embodiment, patterned pixel define sections  102 ′ are semi-cylindrical or semi-elliptical cylinder, and cross sections of the patterned pixel define sections  102 ′ are arc shapes. 
         [0022]    As shown in  FIG. 1C , an electrical conductive material  104  is formed on the first substrate  10  and the patterned pixel define sections  102 ′. As shown in  FIG. 1D , the electrical conductive material  104  on the patterned pixel define sections  102 ′ (shown in  FIG. 1C ) is patterned to form the first electrode layer  104 ′. The first electrode layer  104 ′ comprises a first sub-electrode  104   a  and a second sub-electrode  104   b  spacing apart from the first sub-electrode  104   a  by a spacing w 11 . The patterned pixel define sections  102 ′ has a first lateral surface S 1  and a second lateral surface S 2 , the first sub-electrode  104   a  is disposed on the first lateral surface S 1 , the second sub-electrode  104   b  is disposed on the second lateral surface S 2 . The spacing w 11  is smaller than a maximum width w 12  of the patterned pixel define sections  102 ′. 
         [0023]    As shown in  FIG. 1E , an insulating material  106  is formed to cover the patterned pixel define sections  102 ′ exposed by the spacing w 11  and the first electrode layer  104 ′. As shown in  FIG. 1F , the insulating material  106  (shown in  FIG. 1E ) is patterned to form the insulating layer  106 ′. As shown in  FIG. 1G , the emission layer  108  is formed on the insulating layer  106 ′, and the second electrode layer  110  is formed on the emission layer  108 . As shown in  FIG. 1H , a second substrate  16  is provided. The second substrate  16  is opposite to the first substrate  10 . 
         [0024]    In this embodiment, the display device  1  comprises light emitting pixel unit  12  and pixel define units  14 . In this embodiment, the display device  1  is for example an OLED display device, the light emitting pixel unit  12  is for example an OLED pixel unit, the pixel define units  14  are for example OLED pixel define units. The pixel define units  14  comprise patterned pixel define sections  102 ′, the first electrode layer  104 ′, the insulating layer  106 ′, the emission layer  108  and the second electrode layer  110 . The first electrode layer  104 ′ is for example a reflect electrode layer, the second electrode layer is for example a transparent electrode layer. The insulating layer  106 ′ covers the patterned pixel define sections  102 ′ exposed by the spacing W 11  and parts of the first electrode layer  104 ′. The insulating layer  106 ′ is used for electrical insulating the first electrode layer  104 ′ and the second electrode layer  110 . In particular, as long as the electrical insulation between the first electrode layer  104 ′ and the second electrode layer  110  can be achieved, there is no limitation to the shape of the insulating layer  106 ′. Besides, the height h 11  of the insulating layer  106 ′ is preferably larger than or equal to the height h 12  of the first electrode layer  104 ′. 
         [0025]    In this embodiment, by disposing the first electrode layer  104 ′ on the opposite surfaces of the patterned pixel define sections  102 ′, problems of total reflection of light caused by a refractive index mismatch between the emission layer  108  and the electrode adjacent to the emission layer  108  can be solved. Therefore, the light L transmitted inside the emission layer  108  can be guided to the outside so that the luminous efficiency can be improved. In addition, the less the insulating layer  106 ′ covers the first electrode layer  104 ′, the larger the contact area between the first electrode layer  104 ′ and the emission layer  108  on the patterned pixel define section  102 ′. Therefore, the light emission area of the display device  1  can be improved. 
         [0026]    In this embodiment, the first substrate  10  can be glass substrate or flexible substrate. Besides, the first substrate  10  can be transparent or non-transparent substrate. A color filter, such as a RGB or RGBW color filter can be disposed on the second substrate  16 . 
         [0027]      FIG. 2A  illustrates a display device  2 A according to another embodiment of the invention. As shown in  FIG. 2A , the display device  2 A comprises a first substrate  20 , a second substrate  26 , light emitting pixel units  22  and pixel define units  24 . The light emitting pixel units  22  and pixel define units  24  are interlacedly arranged between the first substrate  20  and the second substrate  26 . The structures and the manufacturing processes of the pixel define units  24  in  FIG. 2A  and that of the pixel define units in  14   FIG. 1H  are similar. The pixel define units  24  comprises patterned pixel define sections  202 , the first electrode layer  204 , the insulating layer  206 , the emission layer  208  and the second electrode layer  210 . The first electrode layer  204  comprises a first sub-electrode  204   a  and a second sub-electrode  204   b.  The minimum distance between the first sub-electrode  204   a  and the second sub-electrode  204   b  is spacing w 21 , and the spacing w 21  is smaller than the maximum width w 22  of the patterned pixel define section  202 . 
         [0028]    In particular, the insulating layer  206  in this embodiment covers at least the patterned pixel define section  202  exposed from the spacing w 21 . Besides, the height h 21  of the insulating layer  206  is preferably larger than or equal to the height h 22  of the first electrode layer  204 . 
         [0029]    By disposing the first electrode layer  204  on the opposite surfaces of the patterned pixel define sections  202 , problems of the total reflection of light caused by the refractive index mismatch between the emission layer  208  and the electrode layers adjacent to the emission layer  208  can be solved. Therefore, the light L transmitted inside the emission layer  208  is guided to the outside and the luminous efficiency can be improved. Moreover, since the insulating layer  206  covers merely the patterned pixel define section  202  exposed from the spacing w 21 , contact areas between the first electrode layer  204  and emission layer  208  on the patterned pixel define sections  202  can be increased and light emitting area of the display device  2 A can also be increased. 
         [0030]    In this embodiment, the first substrate  20  can be glass substrate or flexible substrate. Besides, the first substrate  20  can be transparent or non-transparent substrate. The color filter, such as RGB color filter or RGBW color filter can be disposed on the second substrate  26 . 
         [0031]      FIG. 2B  illustrates a display device  2 B according to another one embodiment of the invention. As shown in  FIG. 2B , the display device  2 B comprises a first substrate  20 ′, a second substrate  26 ′, light emitting pixel units  22 ′ and pixel define units  24 ′. The light emitting pixel units  22 ′ and pixel define units  24 ′ are interlacedly arranged between the first substrate  20 ′ and the second substrate  26 ′. 
         [0032]    In  FIG. 2B , the pixel define unit  24 ′ comprise patterned pixel define sections  202 ′, a first electrode layer  204 ′, an emission layer  208 ′ and a second electrode layer  210 ′. The structure and manufacturing processes of the pixel define units  24 ′ are similar to that of the pixel define units  14  in  FIG. 1H . The difference between the pixel define units  14  and the pixel define units  24 ′ is that the pixel define units  24 ′ lacks of the insulating layer. Therefore, the manufacturing process of the insulating layer can be omitted. 
         [0033]    In this embodiment, the first substrate  20 ′ can be a glass substrate or a flexible substrate. The first substrate  20 ′ can be transparent or non-transparent. A color filter, such as a RGB or RGBW color filter can be disposed on the second substrate  26 . 
         [0034]      FIG. 3  illustrates a display device  3  according to another one embodiment of the invention. As shown in  FIG. 3 , the display device  3  comprises a first substrate  30 , a second substrate  36 , light emitting pixel units  32  and pixel define units  34 . The light emitting pixel units  32  and pixel define units  34  are interlacedly arranged between the first substrate  30  and the second substrate  36 . The pixel define units  34  in  FIG. 3  comprises patterned pixel define sections  302 , a first electrode layer  304 , an insulating layer  306 , an emission layer  308  and a second electrode layer  310 . The structure and the manufacturing processes of the pixel define units  34  are similar to the pixel define units  14  in  FIG. 1H , the differences between the pixel define units  14  and the pixel define units  34  are described below. 
         [0035]    As shown in  FIG. 3 , a cross section of one of the patterned pixel define sections  302  is trapezoid shape and has a base angle θ 1 . The base angle θ 1  ranges between 1 degree to 89 degrees. Preferably, the base angle θ 1  ranges between 30 degrees to 45 degrees. The first electrode layer  304  comprises a first sub-electrode  304   a  and a second sub-electrode  304   b.  A minimum distance between the first sub-electrode  304   a  and the second sub-electrode  304   b  is spacing w 31 . The spacing w 31  is smaller than the maximum width w 32  of the patterned pixel define sections  302 . The insulating layer  306  covers the patterned pixel define sections  302  exposed from the spacing w 31  to provide electrical insulation between the first electrode layer  304  and the second electrode layer  310 . The insulating layer  306  corresponds to the spacing w 31  has a height h 31 . Preferably, the height h 31  of the insulating layer  306  is larger than or equal to the height h 32  of the first electrode layer  304 . 
         [0036]    By disposing the first electrode layer  304  on the opposite surfaces of the patterned pixel define section  302 , problems of the total reflection of light caused by the refractive index mismatch between the emission layer  308  and the electrode layers adjacent to the emission layer  308  can be solved. Therefore, the light L transmitted inside the emission layer  308  is guided to the outside so that the luminous efficiency can be improved. Moreover, since the insulating layer  306  merely covers the patterned pixel define section  302  exposed from the spacing w 21 , contact areas between the first electrode layer  304  and emission layer  308  on the patterned pixel define section  302  can be increased and the light emitting area of the display device  3  can also be increased. 
         [0037]    In this embodiment, the first substrate  30  can be a glass substrate or a flexible substrate. Besides, the first substrate  30  can be transparent or non-transparent. The color filter, such as RGB color filter or RGBW color filter can be disposed on the second substrate  36 . 
         [0038]      FIG. 4  illustrates a display device  4  according to another one embodiment of the invention. As shown in  FIG. 4 , the display device  4  comprises a first substrate  40 , a second substrate  46 , light emitting pixel units  42  and pixel define units  44 . The light emitting pixel units  42  and pixel define units  44  are interlacedly arranged between the first substrate  40  and the second substrate  46 . 
         [0039]    The pixel define units  44  in  FIG. 4  comprises patterned pixel define sections  402 , a first electrode layer  404 , an insulating layer  406 , an emission layer  408  and a second electrode layer  410 . The structure and the manufacturing processes of the pixel define units  44  are similar to that of the pixel define units  34  in  FIG. 3 . Differences between the pixel define units  44  and the pixel define units  34  are that the insulating layer  406  of the pixel define units  44  covers the not only the patterned pixel define section  402  exposed from the spacing w 41 , but also covers a part of the first electrode layer  404 . Therefore, the electrical insulation between the first electrode layer  404  and the second electrode layer  410  can be improved. 
         [0040]    In this embodiment, the first electrode layer  404  comprises a first sub-electrode  404   a  and a second sub-electrode  404   b,  a minimum distance between the first sub-electrode  404   a  and the second sub-electrode  404   b  is the spacing w 41 . The spacing w 41  is smaller than a width w 42  (maximum width of the patterned pixel define section  402 ). A height of the insulating layer  406  in the spacing w 41  is height h 41 . Preferably, the height h 41  is larger than or equal to a height h 42  of the first electrode layer  404 . A cross section of one of the patterned pixel define sections  402  is a trapezoid shape with a base angle θ 2 . A range of the base angle θ 2  can be equal to the base angle θ 1  in  FIG. 3 . 
         [0041]    In this embodiment, the total reflection of light caused by the refractive index mismatch between the emission layer  408  and electrodes adjacent to the emission layer  408  can be solved by disposing the first electrode layer  404  on opposite side surfaces of the patterned pixel define section  402 , so as to guide the light L transmitting in the emission layer  408  to the outside. Therefore, the luminous efficiency can be increased. In addition, the less area the insulating layer  406  covers the first electrode layer  404 , the more contact area between the first electrode layer  404  and the emission layer  408  on the patterned pixel define sections  402 . Therefore, the luminous area of the display device  4  can be increased. 
         [0042]    In this embodiment, the first substrate  40  can be a glass substrate or a flexible substrate. Besides, the first substrate  40  can be transparent or non-transparent. A color filter, such as a RGB or RGBW color filter can be disposed on the second substrate  46 . 
         [0043]      FIG. 5  illustrates a display device  5  according to another embodiment of the invention. As shown in  FIG. 5 , the display device  5  comprises a first substrate  50 , a second substrate  56  and, light emitting pixel units  52  and pixel define units  54 . The light emitting pixel units  52  and pixel define units  54  are interlacedly arranged between the first substrate  50  and the second substrate  56 . 
         [0044]    In  FIG. 5 , the pixel define units  54  comprises patterned pixel define sections  502 , a first electrode layer  504 , an emission layer  508  and the second electrode layer  510 . The structure and the manufacturing process of the pixel define units  54  is similar to that of the pixel define units  34  in  FIG. 3 . The differences between the pixel define units  54  and the pixel define units  34  are that the pixel define units  54  requires no insulating layer. Therefore, the manufacturing process of the insulating layer can be omitted. 
         [0045]    In this embodiment, a cross section of the patterned pixel define section  502  is trapezoid shaped and has a base angle θ 3 . A range of the base angle θ 3  is the same as that of the base angle θ 1  in  FIG. 3 . The first electrode layer  504  comprises a first sub-electrode  504   a  and a second sub-electrode  504   b.  A minimum distance between the first sub-electrode  504   a  and the second sub-electrode  504   b  is spacing w 51 . The spacing w 51  is smaller than a width w 52  of the patterned pixel define section  502 . The width w 52  is a maximum width of the patterned pixel define section  502 . 
         [0046]    In this embodiment, the first substrate  50  can be glass substrate or flexible substrate. Besides, the first substrate  50  can be transparent or non-transparent substrate. A color filter, such as a RGB or RGBW color filter can be disposed on the second substrate  56 . 
         [0047]      FIG. 6  illustrates a display device  6  according to another one embodiment of the invention. As shown in  FIG. 6 , the display device  6  comprises a first substrate  60 , a second substrate  66 , light emitting pixel units  62  and pixel define units  64 . The light emitting pixel units  62  and pixel define units  64  are interlacedly arranged between the first substrate  60  and the second substrate  66 . The pixel define units  64  in  FIG. 6  comprises patterned pixel define sections  602 , a first electrode layer  604 , an insulating layer  606 , an emission layer  608  and a second electrode layer  610 . The structure and manufacturing processes of the pixel define units  64  are similar to that of the pixel define units  14  in  FIG. 1H  and are not described herein. 
         [0048]    As shown in  FIG. 6 , a cross section of the patterned pixel define section  602  is triangle shaped and has a base angle θ 4 . The base angle θ 4  ranges between 1 degree to 89 degrees. Preferably, the base angle θ 4  ranges between 30 degrees to 45 degrees. The first electrode layer  604  comprises the first sub-electrode  604   a  and the second sub-electrode  604   b.  A minimum distance between the first sub-electrode  604   a  and the second sub-electrode  604   b  is spacing w 61 . The spacing w 61  is smaller than a width w 62  of the patterned pixel define section  602 . The width w 62  is a maximum width of the patterned pixel define section  602 . The insulating layer  606  covers the patterned pixel define section  602  exposed from the spacing w 61 , and provides electrical insulation between the first electrode layer  604  and the second electrode layer  610 . Besides, the first sub-electrode  604   a  or the second sub-electrode  604   b  are dispose on side surfaces of the patterned pixel define sections  602  with a vertical height h 61 . Preferably, the vertical height h 61  is larger than a width h 62  of the first electrode layer  604 . 
         [0049]    By disposing the first electrode layer  604  on the opposite surfaces of the patterned pixel define section  602 , problems of the total reflection of light caused by the refractive index mismatch between the emission layer  608  and the electrode layers adjacent to the emission layer  608  can be solved. Therefore, the light L transmitted inside the emission layer  608  is guided to the outside so that the luminous efficiency can be improved. Moreover, since the insulating layer  606  covers merely the patterned pixel define sections  602  exposed from the spacing w 61 , contact areas between the first electrode layer  604  and emission layer  608  on the patterned pixel define section  602  can be increased and the light emitting area of the display device  6  can also be increased. 
         [0050]    In this embodiment, the first substrate  60  can be glass substrate or flexible substrate. Besides, the first substrate  60  can be transparent or non-transparent substrate. A color filter, such as a RGB or RGBW color filter can be disposed on the second substrate  66 . 
         [0051]      FIG. 7  illustrates a display device  7  according to another embodiment of the invention. As shown in  FIG. 7 , the display device  7  comprises a first substrate  70 , a second substrate  76 , light emitting pixel units  72  and pixel define units  74 . The light emitting pixel units  72  and pixel define units  74  are interlacedly arranged between the first substrate  70  and the second substrate  76 . 
         [0052]    The pixel define units  74  in  FIG. 7  comprises patterned pixel define sections  702 , a first electrode layer  704 , an insulating layer  706 , an emission layer  708  and a second electrode layer  710 . The structures and the manufacturing processes of the pixel define units  74  are similar to that of the pixel define units  64  in  FIG. 6 . The differences between the pixel define units  74  and the pixel define units  64  are that the insulating layer  706  of the pixel define units  74  covers not only the patterned pixel define section  702  exposed from the spacing w 71 , but also a part of the first electrode layer  704 . Therefore, the electrical insulation between the first electrode layer  704  and the second electrode layer  710  can be improved. 
         [0053]    In this embodiment, the triangle shaped patterned pixel define section  702  has a base angle θ 5 . A range of the base angle θ 5  is the same as the base angle θ 4  in  FIG. 6 . The first electrode layer  704  comprises a first sub-electrode  704   a  and a second sub-electrode  704   b.  The minimum distance between the first sub-electrode  704   a  and the second sub-electrode  704   b  is a width of the spacing w 71 . The width of the spacing w 71  is smaller than the maximum width w 72  of the patterned pixel define section  702 . Besides, the first sub-electrode  704   a  or the second sub-electrode  704   b  are disposed on opposite side surfaces of the patterned pixel define sections  702  with a vertical height h 71 . Preferably, the vertical height h 71  is larger than a width h 72  of the first electrode layer  704 . 
         [0054]    In this embodiment, by disposing the first electrode layer  704  on the opposite surfaces of the patterned pixel define sections  702 , problems of the total reflection of light caused by the refractive index mismatch between the emission layer  708  and the electrode layers adjacent to the emission layer  708  can be improved. Therefore, the light L transmitted inside the emission layer  708  is guided to the outside and the luminous efficiency can be improved. Moreover, since the insulating layer  706  covers merely the patterned pixel define sections  702  exposed from the spacing w 71 , contact areas between the first electrode layer  704  and emission layer  708  on the patterned pixel define sections  702  can be increased and the light emitting area of the display device  7  can also be increased. 
         [0055]    In this embodiment, the first substrate  70  can be glass substrate or flexible substrate. Besides, the first substrate  70  can be transparent or non-transparent substrate. A color filter, such as a RGB or RGBW color filter can be disposed on the second substrate  76 . 
         [0056]      FIG. 8  illustrates a display device  8  according to another embodiment of the invention. As shown in  FIG. 8 , the display device  8  comprises a first substrate  80 , a second substrate  86 , light emitting pixel units  82  and pixel define units  84 . The light emitting pixel units  82  and pixel define units  84  are interlacedly arranged between the first substrate  80  and the second substrate  86 . 
         [0057]    In  FIG. 8 , the pixel define units  84  comprises patterned pixel define sections  802 , a first electrode layer  804 , an emission layer  808  and a second electrode layer  810 . The structures and the manufacturing processes of pixel define units  84  are similar to that of the pixel define units  64  in  FIG. 6 . The differences between the pixel define units  84  and the pixel define units  64  are that the pixel define units  84  require no an insulating layer, so that the manufacturing process of an insulating layer can be omitted. 
         [0058]    In this embodiment, the triangle shaped patterned pixel define section  802  has a base angle θ 6 . A range of base angle θ 6  can be the same as the range of the base angle θ 4  in  FIG. 6 . The first electrode layer  804  comprises a first sub-electrode  804   a  and a second sub-electrode  804   b.  The minimum distance between the first sub-electrode  804   a  and the second sub-electrode  804   b  is a width of the spacing w 81 , the width of the spacing w 81  is smaller than the maximum width w 82  of the patterned pixel define section  802 . Besides, the first sub-electrode  804   a  or the second sub-electrode  804   b  are dispose on opposite side surfaces of the patterned pixel define sections  802  with a vertical height h 81 . Preferably, the vertical height h 81  is larger than a width h 82  of the first electrode layer  804 . 
         [0059]    In this embodiment, the first substrate  80  can be glass substrate or flexible substrate. Besides, the first substrate  80  can be transparent or non-transparent substrate. A color filter, such as a RGB or RGBW color filter can be disposed on the second substrate  86 . 
         [0060]    Based on the above, a display device according to the embodiments described above can be manufactured by uncomplicated manufacturing processes. By disposing an electrode layer on opposite side surfaces of patterned pixel define sections of the display device, the total reflection of light caused by a refractive index mismatch between the emission layer and the electrode adjacent to the emission layer can be destroyed. Therefore, the light transmitted inside the emission layer can be guided to the outside so that the luminous efficiency of the display device can be improved. 
         [0061]    While the invention has been described by way of example and in terms of the preferred embodiment(s), it is to be understood that the invention is not limited thereto. On the contrary, it is intended to cover various modifications and similar arrangements and procedures, and the scope of the appended claims therefore should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements and procedures.