Abstract:
The present invention relates to a light emitting display device, such as an organic electroluminescent device, and a method for manufacturing the same. Particularly, the present invention relates to reducing electrical resistance between the scan lines and the cathode electrode layers so that scan line signals do not degrade significantly degrade. One way to achieve this is to use materials to form the conducting layers of the scan line and the cathode electrode layers such that the conductivities of the conducting layers and the cathode electrode layer are as identical as possible. For example, if a same metal such as aluminum is used to form both the conducting layer and the cathode electrode layer, the resistance would be significantly lowered. In addition, a large contacting area may be provided.

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates to a light emitting display device, such as an electroluminescent device, and a method for manufacturing the same. Particularly, the present invention relates to a light emitting display device that minimizes a resistance between connecting layers of scan lines and cathode electrode layers. 
   2. Description of the Prior Art 
   A light emitting display device, such as an organic electroluminescent device, emits light having a predetermined wavelength when a certain voltage is applied thereto. 
     FIG. 1   a  is a plane view illustrating a related art organic electroluminescent device. As illustrated, the related art organic electroluminescent device comprises anode electrode layers  100 , cathode electrode layers  102  and scan lines  101 . 
   A plurality of pixels  104  are formed in luminescent areas at the crossings of the anode electrode layers  100  and the cathode electrode layers  102 . The scan lines  101  correspond to the cathode electrode layers  102 . 
     FIG. 1   b  is a cross sectional view illustrating the related art organic electroluminescent device taken along the line I-I′ of  FIG. 1   a . In  FIG. 1   b , each pixel  104  comprises the anode electrode layer  100 , an organic layer  118  and the cathode electrode layer  102  stacked in sequence on a substrate  110 . 
   Also as illustrated in  FIG. 1   b , the scan line  101  comprises a scan line electrode layer  112  and a sub-electrode layer  114  stacked in sequence on the substrate  110 . The sub-electrode layer  114  is made of molybdenum. The sub-electrode layer  114  makes contact with the cathode electrode layer  102 . Thus, scan signals transferred from an integrated circuit chip (not shown) are transferred to the cathode electrode layer  102  through the scan line electrode layer  112  and the sub-electrode layer  114 . 
   The related art device suffers from at least the following problem. The resistance value of the sub-electrode layer  114  is relatively high. Also, the contact area between the sub-electrode layer  114  and the cathode electrode layer  102  is relatively small. As a result, the scan signals transferred to cathode electrode layer  102  through the scan line electrode layer  112  and the sub-electrode layer  114  are significantly reduced. 
   SUMMARY OF THE INVENTION 
   An object of the present invention is to provide a light emitting display device, such as an organic electroluminescent device, having scan lines with low resistance value. 
   Another object of the present invention is to provide a light emitting display device capable of electrically connecting conducting layers of scan lines and cathode electrode layers with similar conductivity with a large contacting area. 
   A light emitting display device according to an embodiment of the present invention, having luminescent areas formed by anode electrode layers and cathode electrode layers intersecting with the anode electrode layers, includes scan lines formed spaced apart from the anode electrode layers, having at least one via hole formed on the upper surface and conducting layers formed from materials with substantially identical conductivity as the cathode electrode layers, wherein the conducting layers are electrically connected to the cathode electrode layers respectively through the at least one via hole. Preferably, the conducting layers and the cathode electrode layers are formed from the same material such as aluminum. 
   Preferably, the scan line has a scan line electrode layer, a first sub-electrode layer, the conducting layer and a second sub-electrode layer stacked in sequence, and the at least one via hole is formed on the second sub-electrode layer, and extending to the conducting layer. Also, the conducting layer and the cathode electrode layer may be formed from aluminum, and the sub-electrode layers may be formed from molybdenum or chrome. 
   A light emitting display device according to various embodiments of the present invention, having anode electrode layers, insulating layer, organic layers and cathode electrode layers stacked in sequence, includes scan lines formed spaced apart from the anode electrode layers, having conducting layers formed from materials with substantially identical conductivity as the cathode electrode layers; and supporting layers formed between the scan lines and the anode electrode layers, wherein the cathode electrode layers are supported by the supporting layers, and electrically connected to the conducting layers respectively. Preferably, the conducting layers and the cathode electrode layers are formed from same conductive material such as aluminum. 
   Preferably, the scan line has a scan line electrode layer, a first sub-electrode layer, the conducting layer and a second sub-electrode layer stacked in sequence. Also, the conducting layers and the cathode electrode layers can be formed from aluminum and the sub-electrode layers can be formed from molybdenum or chrome. 
   Preferably, the height of supporting layer is same as the total height of scan line electrode layer and first sub-electrode layer. Also, the supporting layer consists of the same substance as the insulating layer. 
   A light emitting display device according to an embodiment of the present invention, having luminescent areas formed by anode electrode layers and cathode electrode layers intersecting with the anode electrode layers, comprises scan lines having conducting layers formed from materials with a conductivity substantially identical as the cathode electrode layers, wherein the conducting layer is exposed through at least a cut-out part formed at the end of the scan line, and electrically connected to the cathode electrode layer filled in the cut-out part. Preferably, the conducting layers and the cathode electrode layers can be formed from a same conducting metal such as aluminum. 
   Preferably, the scan line has a scan line electrode layer, a first sub-electrode layer, the conducting layer and a second sub-electrode layer stacked in sequence. Also, the conducting layers and the cathode electrode layers are formed from aluminum, and the sub-electrode layers are formed from molybdenum or chrome. 
   A light emitting display device according to an embodiment of the present invention, having luminescent areas formed by anode electrode layers and cathode electrode layers intersecting with the anode electrode layers, comprises scan lines formed spaced from the anode electrode layers, having conducting layers formed from materials with substantially identical conductivity as the cathode electrode layers, wherein the conducting layers and the cathode electrode layers are extended to the area between the scan lines and anode electrode layers, and connected respectively. Preferably, the conducting layers and the cathode electrode layers are formed from a same conducting material such as aluminum. 
   Preferably, the scan line has a scan line electrode layer, a first sub-electrode layer, the conducting layer and a second sub-electrode layer stacked in sequence. Also, the conducting layers and the cathode electrode layers are formed from aluminum, and the sub-electrode layers are formed from molybdenum or chrome. 
   A manufacturing method of a light emitting display device according to the present invention, comprises the steps of forming anode electrode layers and scan lines having conducting layers, spaced apart from each other on a substrate; forming insulating layer on the scan line and the anode electrode layer; patterning the insulating layer, and exposing luminescent areas on the anode electrode layer and a part of the conducting layer; forming organic layer on the luminescent area; and forming cathode electrode layer over the exposed conducting layer and the organic layer, and electrically connecting them. 
   Preferably, the scan line is formed by stacking a scan line electrode layer, a first sub-electrode layer, the conducting layer and a second sub-electrode layer in sequence. Also, the cathode electrode layer can be formed from a material with substantially identical conductivity as the conductive layer. Here, the conductive layers and the cathode electrode layers can both be formed from aluminum. 
   A manufacturing method of a light emitting display device according to an embodiment of the present invention comprises the steps of forming anode electrode layers and scan lines having conducting layers, spaced from each other on a substrate; forming insulating layer on the anode electrode layer, and exposing luminescent areas; forming supporting layers between the anode electrode layer and the scan line; forming organic layer on the luminescent area; and forming cathode electrode layer on the organic layer, wherein the cathode electrode layer is supported by the supporting layer and electrically connected the conducting layer. Preferably, the insulating layer and the supporting layer are simultaneously formed. 
   Preferably, the scan line is formed by stacking a scan line electrode layer, a first sub-electrode layer, the conducting layer and a second sub-electrode layer in sequence. Here, the height of supporting layer is substantially the same as the total height of scan line electrode layer and first sub-electrode layer. Also, the cathode electrode layer can be formed from a material with substantially identical conductivity as the conducting layer. Here, the conducting layers and the cathode electrode layers can be formed from aluminum. 
   A manufacturing method of a light emitting display device according to an embodiment of the present invention comprises the steps of forming anode electrode layers and scan lines having conducting layers, spaced apart from each other on a substrate; forming at least a cut-out part at the end of the scan line, and exposing the conducting layer; forming insulating layer on the anode electrode layer, and exposing luminescent areas; forming organic layer on the luminescent area; and forming cathode electrode layer on the organic layer, wherein the cathode electrode layer is formed to fill the cut-out part, and electrically connected to the conducting layer. 
   Preferably, the scan line is formed by stacking a scan line electrode layer, a first sub-electrode layer, the conducting layer and a second sub-electrode layer in sequence. Also, the cathode electrode layer can be formed from a material with substantially identical conductivity as the conducting layer. Here, the conducting layer and the cathode electrode layer can be formed from aluminum. 
   A manufacturing method of a light emitting display device according to an embodiment of the present invention, comprises the steps of forming anode electrode layers and scan lines having conducting layers, spaced apart from each other on a substrate, wherein the conducting layer is extended to the area between the anode electrode layer and the scan line; forming insulating layer on the anode electrode layer, and exposing luminescent areas; forming organic layer on the luminescent area; and forming cathode electrode layer on the organic layer, wherein the cathode electrode layer is connected to the extended conducting layer directly. 
   Preferably, the scan line is formed by stacking a scan line electrode layer, a first sub-electrode layer, the conducting layer and a second sub-electrode layer in sequence. Also, the cathode electrode layer can be formed from a material with substantially identical conductivity as the conducting layer. Here, the conducting layer and the cathode electrode layer can be formed from aluminum. 
   Because the scan line of the light emitting display device according to the embodiments of the present invention has layers with multi-layered structure on the scan line electrode layer, the resistance of the scan line is significantly reduced. 
   Also, because the cathode electrode layer and the conducting layer of the scan line have substantially identical conductivities and are electrically connected through a large contact area, the contact resistance between the cathode electrode layer and the conducting layer is significantly reduced. 

   
     BRIEF DESCRIPTION OF THE DRAWING 
     The present invention will be more clearly understood from the detailed description in conjunction with the following drawings. 
       FIG. 1   a  is a plane view illustrating a related art organic electroluminescent device. 
       FIG. 1   b  is a cross-sectional view of the related art organic electroluminescent device taken along line I-I′ of  FIG. 1   a.    
       FIG. 2   a  is a plane view illustrating a light emitting display device according to a first embodiment of the present invention. 
       FIG. 2   b  is a cross-sectional view illustrating the light emitting display device of  FIG. 2   a  as taken along line II-II′. 
       FIG. 3  is a plane view illustrating a light emitting display device according to a second embodiment of the present invention. 
       FIG. 4   a  to  4   c  is a sectional view illustrating a method of manufacturing a light emitting display device according to an embodiment of the present invention. 
       FIG. 5  is a cross-sectional view illustrating a light emitting display device according to a third embodiment of the present invention. 
       FIG. 6  is a plane view illustrating a light emitting display device according to a fourth embodiment of the present invention. 
       FIG. 7  is a cross-sectional view illustrating the light emitting display device of  FIG. 6  as taken along line VII-VII′. 
       FIG. 8  is a cross-sectional view illustrating the light emitting display device of  FIG. 6  as taken along line VIII-VIII′. 
       FIG. 9  is a cross-sectional view illustrating a light emitting display device according to a fifth embodiment of the present invention. 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   Hereinafter, embodiments of the light emitting display devices and the method of manufacturing the same according to the present invention will be explained in more detail with reference to the accompanying drawings. 
     FIG. 2   a  is a plane view illustrating a light emitting display device according to the first embodiment of the present invention. In  FIG. 2   a , an organic electroluminescent display is illustrated for explanation purposes. However, the invention is not limited to organic electroluminescent displays. 
   As shown in  FIG. 2   a , the organic electroluminescent device embodiment of the present invention includes anode electrode layers  200 , cathode electrode layers  202  and scan lines  201 . 
   A plurality of pixels  204  are formed in luminescent areas at the crossings of the anode electrode layers  200  and the cathode electrode layers  202 . ITO layers are preferred to form the anode electrode layers  200 , and metal layers are preferred to form the cathode electrode layers  202 . The pixels  204  emit light when a sufficient voltage differential exists between the corresponding anode electrode layer  200  and the cathode electrode layer  202 . For example, a positive voltage may be applied to the anode electrode layers  200  and a negative voltage may be applied to the cathode electrode layers  202 . Note that scan lines  201  correspond to the cathode electrode layers  202  respectively. 
     FIG. 2   b  is a cross-sectional view illustrating the light emitting display device of  FIG. 2   a  as taken along line II-II′. As illustrated in  FIG. 2   b , each pixel  204  (also referred to as a pixel area or a unit pixel) includes the anode electrode layer  200 , a luminescent layer  222  and the cathode electrode layer  202 . An example of the luminescent layer  222  is an organic layer. The pixel area may be thought of generally as an area of the substrate covered by the organic layer  222 . The organic layer  222  may comprise a hole transporting layer (HTL), an emitting layer (EML) and an electron transporting layer (ETL). 
   Also as illustrated in  FIG. 2   b , each scan line  201  (also referred to as a scan line area) includes a scan line electrode layer  212 , a first sub-electrode layer  214 , the conducting layer  216  and a second sub-electrode layer  218 , stacked on the substrate  210 . The layers  212 ,  214 ,  216  and  218  may be stacked in the sequence as shown. The scan line area may be thought of generally as an area of the substrate covered by the scan line electrode layer  212 . 
   The first sub-electrode layer  214  prevents oxidation resulting from the contact of the scan line electrode layer  212  and the conducting layer  216 , which may be a metal layer. Molybdenum (Mo) or chrome materials may be used to form the first sub-electrode layer  214 . 
   The second sub-electrode layer  218  prevents oxidation of the conducting layer  216 . Again, molybdenum or chrome material may be used to form the second sub-electrode layer  218 . When moisture penetrates the conducting layer  216  in the process of manufacturing the light emitting display device, the second sub-electrode layer  218  prevents the moisture from penetrating the conducting layer  216 . 
   The conducting layer  216  can be formed from a metal material such as aluminum. 
   As illustrated in  FIG. 2   b , the scan line  201  includes a multi-layered structure on the scan line electrode layer  212 , which is different from the related art organic electroluminescent device with one-layered structure on the scan line electrode layer. The multi-layered structure significantly lowers the resistance value when compared to the related art device. As a result, the scan signals transferred to the cathode electrode layer  202  through the scan line  201  and through the multi-layered structure of the present embodiment is reduced significantly less than through the related art device as illustrated in  FIG. 1   b.    
   Referring back to  FIG. 2   b , an insulating layer  220  is disposed on the second sub-electrode layer  218  and a via hole  208  is formed on the scan line  201  through the insulating layer  220  and the second sub-electrode layer  218  to expose a portion of the conducting layer  216 . The cathode electrode layer  202  can be deposited in the via hole  208 . Indeed, the upper surface of the conducting layer  216  can directly contact the cathode electrode layer  202  through the via hole  208 . 
     FIG. 2   b  depicts the layers as being disposed “on” each other, i.e. in physical contact with each other. As examples, the first sub-electrode layer  214  is depicted as being on the scan line electrode layer  212 , the conducting layer  216  is depicted as being on the first sub-electrode layer  214 , etc. 
   However, this is not a strict requirement. The layers may be disposed “over” another layer. All that is necessary is that there is electrical communication between the layers such that the scan signals from the scan line electrode layer  212  can be transferred to the cathode electrode layer  202  through the multilayered structure. 
   To lower the overall resistance, it is preferred that the electrical conductivities of the conducting layer  216  and the cathode electrode layer  202  be essentially identical to each other. For example, if both the conducting layer  216  and the cathode electrode layer  202  are formed from the same material such as aluminum, then the conductivities of the two layers would be identical to each other. 
   This multilayered structure lowers the overall resistance so that the scan line signal from the scan line electrode layer  212  is transferred to the cathode electrode layer  202  without any significant degradation. As seen, the contact area between the first sub-electrode layer  214  and the conducting layer  216  is large to thereby reduce the resistance. Also, even though the contact area between the conducting layer  216  and the cathode electrode layer  202  may be relatively small, because the conductivities of these layers are substantially identical, the resistance is also lowered. As a result, the light emitting display device of the present invention can reduce power consumption more than the related art organic electroluminescent device. 
   The structure of the scan line  201  of the light emitting display device according to the first embodiment of the present invention can be applied to the data lines as well. 
     FIG. 3  is a plane view illustrating a light emitting display according to a second embodiment of the present invention. Again for explanatory purposes only, an organic electroluminescent device is illustrated. As shown, the organic electroluminescent device includes anode electrode layers  200 , cathode electrode layers  202  and scan lines  201 . The remaining elements are similar to the elements of  FIG. 2   a . Therefore, the description for them is omitted. 
   In  FIG. 3 , a plurality of via holes  308  are formed on each scan line  201  rather than a single via hole  208  (see  FIGS. 2   a  and  2   b ). Thus, the total area of the conducting layer  216  exposed through the via holes  308 , through which the cathode electrode layer  202  electrically communicates with the conducting layer  216 , is larger than that of the first embodiment as illustrated in  FIG. 2   a . The second embodiment allows the the contact resistance value between the conducting layer  216  and the cathode electrode layer  202  to be lowered even further. 
     FIG. 4   a  to  4   c  are views illustrating a method of manufacturing a light emitting display device. 
   As illustrated in  FIG. 4   a , an anode electrode layer  402  and a scan line electrode layer  404  are deposited on a substrate  400 . For example, ITO layers are deposited on the substrate  400 , and then the ITO layers are patterned to form the anode electrode layer  402  and the scan line electrode layer  404 . 
   Then, a first sub-electrode layer  406 , a conducting layer  408  and a second sub-electrode substance  410  are deposited on the scan line electrode layer  404  in sequence. Here, aluminum may be used for the conducting layer  408  and molybdenum or chrome may be used for the first sub-electrode layer  406  and/or the second sub-electrode substance  410 . Then, the insulating substance  412  is deposited to cover the anode electrode layers  402 , the second sub-electrode substance  410  and the substrate  400 . 
   As illustrated in  FIG. 4   b , the second sub-electrode substance  410  and the insulating substance  412  are etched to form an insulating layer  414 , a second sub-electrode layer  416  and a via hole  418  to expose a portion of the conducting layer  408  in the scan line area. Also, a portion of the anode electrode layer  402  in the pixel area may be exposed through the etching process. 
   As illustrated in  FIG. 4   c , an organic layer  420  is deposited on the anode electrode layer  402 . A cathode electrode layer  422  is then deposited on the exposed area of the conducting layer  408 , the insulating layer  414  and the organic layer  420  to electrically connect the organic layer  420  and the conducting layer  408 . 
     FIG. 5  is a cross-sectional view illustrating a light emitting display device according to a third embodiment of the present invention. The device of the third embodiment includes anode electrode layers  502 , cathode electrode layers  524  and scan lines  501 . The remaining elements except for the scan lines  501  are similar to the elements of the first embodiment illustrated in  FIG. 2   a . Therefore, the description for them is omitted. 
   The scan line  501  includes a scan line electrode layer  512 , a first sub-electrode layer  506 , a conducting layer  508  and a second sub-electrode layer  516 , stacked on a substrate  500 . 
   A supporting layer  514  is formed over the space between the scan line  501  and the anode electrode layer  502 , i.e. between the scan line area and the pixel area. The height of the supporting layer  514  is such that a cathode electrode layer  524  is supported by the supporting layer  514  to extend horizontally from the scan line area at a level substantially identically to the level of the conducting layer  508 . For example, the height of supporting layer  514  can be made to be substantially the same as the total height of scan line electrode layer  512  and first sub-electrode layer  506 . The supporting layer  514  can be formed by extending the insulating layer formed between the anode electrode layer  502  and an organic layer  520 . 
   The cathode electrode layer  524  electrically communicates with the conducting layer  508  through a side portion of the conducting layer  508 . Indeed, the cathode electrode layer  524  can be in direct contact with the side portion of the conducting layer  508 . 
   As noted previously, the conducting layer  508  and the cathode electrode layer  524  have substantially identical conductivities. This can be accomplished by using a same metal, for example aluminum to form both layers. Therefore, the contact resistance value between the conducting layer  508  and the cathode electrode layer  524  is low. This in turn can reduce power consumption more than the related art organic electroluminescent device. 
   The manufacturing process of the organic electroluminescent device according to the third embodiment of the present invention is as follows. The anode electrode layers  502  and scan lines  501  are formed spaced from each other on the substrate  500 . The scan line  501  is formed by stacking the scan line electrode layer  512 , the first sub-electrode layer  506 , the conducting layer  508  and the second sub-electrode layer  516  in sequence. Here, aluminum may be used to form the conducting layer  508  and molybdenum or chrome may be used to form the first sub-electrode layer  506  and/or the second sub-electrode layer  516 . 
   Then, the insulating layer is formed over the anode electrode layer  502 . Luminescent areas on the anode electrode layer  502  are exposed by patterning the insulating layer. 
   The supporting layer  514  is formed by filling the space between the scan line  501  and the anode electrode layer  502  with the insulating layer  514 . The supporting layer  514  is formed at the same height as the total height of scan line electrode layer  512  and first sub-electrode layer  506 . 
   Then, the organic layer  520  is formed at the exposed luminescent area. The cathode electrode layer  524  is formed over the organic layer  520  and extended to the scan line  501 , supported by the supporting layer  514 , and to be electrically communicating with the conducting layer  508 , for example through direct contact. 
     FIG. 6  is a plane view illustrating a light emitting display device according to a fourth embodiment of the present invention.  FIG. 7  is a cross-sectional view illustrating the light emitting display device of  FIG. 6  as taken along line VII-VII′.  FIG. 8  is a cross-sectional view illustrating the organic electroluminescent device of  FIG. 6  as taken along line VIII-VIII′. 
   Referring back to  FIG. 6 , the light emitting display device includes anode electrode layers  702 , cathode electrode layers  722  and scan lines  701 . The remaining elements are similar to the elements of the first embodiment illustrated in  FIG. 2   a . Therefore, the description for them is omitted. 
   As illustrated in  FIG. 7 , the scan line  701  includes a scan line electrode layer  704 , a first sub-electrode layer  706 , a conducting layer  708  and a second sub-electrode layer  716 , stacked on a substrate  700 . The cathode electrode layer  722  is extended to cover the end of the scan line  701 . The conductivities of the cathode electrode layer  722  and the conducting layer  708  are substantially identical. Also, the cathode electrode layer  722  and the conducting layer  708  communicate electrically with each other substantially at the end of the scan line  701 . 
   As illustrated in  FIG. 8 , at least one cut-out part  712  is formed at the end of the scan line  701  to increase the contact area of the cathode electrode layer  722  and the conducting layer  708 . The cathode electrode layer  722  is formed to fill the cut-out part  712  to increase the contact area with the conducting layer  708 . 
   The conducting layer  708  and the cathode electrode layer  722  can be formed from the same metal, for example aluminum. This significantly reduces the contact resistance between the conducting layer  708  and the cathode electrode layer  722  when compared to the contact resistance value between the sub-electrode layer and the cathode electrode layer of the related art. As a result, the light emitting display device of this embodiment can significantly reduce power consumption when compared to the related art device. 
   In  FIG. 8 , the cut-out part  712  is formed to expose the substrate  700  such that the cathode electrode layer  722  is filled down to the substrate  700 . This has the added benefit in that the scan signal can be transferred from the scan line electrode layer  704  to the cathode electrode layer  722  to further lower the contact resistance. 
   However, it is not a requirement that the cut-out part  712  be formed to expose the substrate  700 . It is only necessary to form the cut-out part  712  enough to expose the conducting layer  708  so that the cathode electrode layer  722  electrically communicates with the conducting layer  708 . 
   A method of manufacturing the light emitting display device according to the fourth embodiment of the present invention is as follows. 
   The anode electrode layers  702  and scan lines  701  are formed spaced from each other on the substrate  700 . The scan line  701  is formed by stacking the scan line electrode layer  704 , the first sub-electrode layer  706 , the conducting layer  708  and the second sub-electrode layer  716  in sequence. Here, aluminum may be used for the conducting layer  708  and molybdenum or chrome may be used for the first sub-electrode layer  706  and/or the second sub-electrode layer  716 . Then, the cut-out part  712  is formed by etching a part of the end of the scan line  701  to expose the conducting layer  708 . 
   Then, the insulating layer  714  is formed over the anode electrode layer  702 . Luminescent areas  710  (pixel areas) on the anode electrode layer  702  are exposed by patterning the insulating layer  714 . Then, the organic layer  720  is formed over the exposed luminescent area  710 . 
   The cathode electrode layer  722  is formed to cover the end of the scan line  701  and to fill the cut-out part  712  so that electrical communication may be established with the conducting layer  708 . In  FIGS. 7 and 8 , electrical communication is established by direct contact. However, this is not strictly necessary. 
     FIG. 9  is a cross-sectional view illustrating a light emitting display device according to a fifth embodiment of the present invention. As illustrated, the light emitting display device includes anode electrode layers  802 , cathode electrode layers  822  and scan lines  801 . The remaining elements are similar to the elements of the first embodiment illustrated in  FIG. 2   a . Therefore, the description for them is omitted. 
   The scan line  801  includes a scan line electrode layer  804 , a first sub-electrode layer  806 , a conducting layer  808  and a second sub-electrode layer  816 , stacked on a substrate  800 . The conducting layer  808  is extended to the space formed between the scan line  801  and the anode electrode layer  802 , i.e. between the scan line area and the pixel area. Also, the cathode electrode layer  822  is extended to the same space to establish electrical communication with the conducting layer  808 . Again, direct physical contact is one way to establish such electrical communication. 
   The conducting layer  808  and the cathode electrode layer  822  can be formed from the same metal, for example aluminum, so that the conductivities of the two layers are essentially identical. As a result, the contact resistance between the conducting layer  808  and the cathode electrode layer  822  is significantly reducted, and thus the device can reduce power consumption as compared to the related art device. 
   The manufacturing process of the light emitting display device according to the fifth embodiment of the present invention is as follows. The anode electrode layers  802  and scan lines  801  are formed to be spaced apart from each other on the substrate  800 . The scan line  801  is formed by stacking the scan line electrode layer  804 , the first sub-electrode layer  806 , the conducting layer  808  and the second sub-electrode layer  816  in sequence. Again, aluminum may be used for the conducting layer  808  and molybdenum or chrome may be used for the first sub-electrode layer  806  and/or the second sub-electrode layer  816 . The conducting layer  808  is formed to be extended to the space formed between the scan line  801  and the anode electrode layer  802 . 
   Then, the insulating layer  814  is formed over the anode electrode layer  802 . Luminescent areas on the anode electrode layer  802  are exposed by patterning the insulating layer  814 . Then, the organic layer  820  is formed at the exposed luminescent area. 
   The cathode electrode layer  822  is formed to also extend to the space formed between the scan line  801  and the anode electrode layer  802  to establish electrical communication with the conducting layer  808 , for example by direct contact. 
   From the above preferred embodiments for the present invention, it is noted that modifications and variations can be made by a person skilled in the art in light of the above teachings. Therefore, it should be understood that changes may be made for a particular embodiment of the present invention within the scope and the spirit of the present invention outlined by the appended claims.