Display device and electronic device

Abstract

A display device capable of displaying a picture of vivid colors maintaining a good balance of colors and a good balance of light-emitting brightnesses of the EL elements. The widths of the detour wirings supplying current to the power source feed lines are increased for those EL elements into which a current of a large density flows. This constitution decreases the wiring resistances of the detour wirings, decreases the potential drop through the detour wirings, and suppresses the amount of electric power consumed by the detour wirings.

What is claimed is: 
     
         1 . A light-emitting device comprising:
 a substrate;   a first column of first EL elements over the substrate, the first EL elements each comprising a first electrode connected to a first TFT and being configured to emit light of a first color;   a second column of second EL elements over the substrate, the second EL elements each comprising a second electrode electrically connected to a second TFT and being configured to emit light of a second color different from the first color;   a first power source feed line over the substrate, the first power source feed line being configured to supply current to the first EL elements through the first TFTs; and   a second power source feed line over the substrate, the second power source feed line being configured to supply current to the second EL elements through the second TFTs,   wherein a first width of the first power source feed line is different from a second width of the second power source feed line.   
     
     
         2 . The light-emitting device according to  claim 1 ,
 wherein the first EL elements are configured to emit red light,   wherein the second EL elements are configured to emit green light, and   wherein a first channel width of the first TFTs is different from a second channel width of the second TFTs.   
     
     
         3 . The light-emitting device according to  claim 1 ,
 wherein the first EL elements are configured to emit red light,   wherein the second EL elements are configured to emit green light,   wherein a first channel width of the first TFTs is greater than a second channel width of the second TFTs, and   wherein the first width of the first power source feed line is greater than the second width of the second power source feed line.   
     
     
         4 . The light-emitting device according to  claim 1 , further comprising:
 a first draw-out terminal;   a second draw-out terminal;   a first detour wiring; and   a second detour wiring,   wherein the first power source feed line is electrically connected to the first draw-out terminal through the first detour wiring, and   wherein the second power source feed line is electrically connected to the second draw-out terminal through the second detour wiring.   
     
     
         5 . The light-emitting device according to  claim 1 , further comprising:
 a first draw-out terminal;   a second draw-out terminal;   a first detour wiring; and   a second detour wiring,   wherein the first power source feed line is electrically connected to the first draw-out terminal through the first detour wiring,   wherein the second power source feed line is electrically connected to the second draw-out terminal through the second detour wiring, and   wherein a width of the first detour wiring is different from a width of the second detour wiring.   
     
     
         6 . A light-emitting device comprising:
 a substrate;   a detour wiring;   a draw-out terminal;   a first column of first EL elements over the substrate, the first EL elements each comprising a first electrode connected to a first TFT and being configured to emit light of a first color;   a second column of second EL elements over the substrate, the second EL elements each comprising a second electrode electrically connected to a second TFT and being configured to emit light of a second color different from the first color;   a first power source feed line over the substrate, the first power source feed line being configured to supply current to the first EL elements through the first TFTs; and   a second power source feed line over the substrate, the second power source feed line being configured to supply current to the second EL elements through the second TFTs,   wherein a first width of the first power source feed line is different from a second width of the second power source feed line, and   wherein the first power source feed line is electrically connected to the draw-out terminal through the detour wiring.   
     
     
         7 . A light-emitting device comprising:
 a substrate;   a detour wiring;   a draw-out terminal;   a first column of first EL elements over the substrate, the first EL elements each comprising a first electrode connected to a first TFT and being configured to emit light of a first color;   a second column of second EL elements over the substrate, the second EL elements each comprising a second electrode electrically connected to a second TFT and being configured to emit light of a second color different from the first color;   a first power source feed line over the substrate, the first power source feed line being configured to supply current to the first EL elements through the first TFTs; and   a second power source feed line over the substrate, the second power source feed line being configured to supply current to the second EL elements through the second TFTs,   wherein a first width of the first power source feed line is different from a second width of the second power source feed line,   wherein a first channel width of the first TFTs is different from a second channel width of the second TFTs, and   wherein the first power source feed line is electrically connected to the draw-out terminal through the detour wiring.   
     
     
         8 . The light-emitting device according to  claim 7 ,
 wherein the first EL elements are configured to emit red light,   wherein the second EL elements are configured to emit green light, and   wherein the first channel width is greater than the second channel width.   
     
     
         9 . The light-emitting device according to  claim 7 ,
 wherein the first EL elements are configured to emit red light,   wherein the second EL elements are configured to emit green light,   wherein the first channel width is greater than the second channel width, and   wherein the first width of the first power source feed line is greater than the second width of the second power source feed line.   
     
     
         10 . The light-emitting device according to  claim 6 , further comprising:
 an additional detour wiring;   an additional draw-out terminal,   wherein the second power source feed line is electrically connected to the additional draw-out terminal through the additional detour wiring.   
     
     
         11 . The light-emitting device according to  claim 7 , further comprising:
 an additional detour wiring;   an additional draw-out terminal,   wherein the second power source feed line is electrically connected to the additional draw-out terminal through the additional detour wiring.   
     
     
         12 . The light-emitting device according to  claim 1 ,
 wherein the first EL elements are configured to emit red light,   wherein the second EL elements are configured to emit green light, and   wherein the first width is greater than the second width.   
     
     
         13 . The light-emitting device according to  claim 6 ,
 wherein the first EL elements are configured to emit red light,   wherein the second EL elements are configured to emit green light, and   wherein the first width is greater than the second width.   
     
     
         14 . The light-emitting device according to  claim 7 ,
 wherein the first EL elements are configured to emit red light,   wherein the second EL elements are configured to emit green light, and   wherein the first width is greater than the second width.   
     
     
         15 . The light-emitting device according to  claim 1 ,
 wherein the first power source feed line and the second power source feed line are configured to be set at a first potential and at a second potential, respectively, the second potential being different from the first potential.   
     
     
         16 . The light-emitting device according to  claim 6 ,
 wherein the first power source feed line and the second power source feed line are configured to be set at a first potential and a at second potential, respectively, the second potential being different from the first potential.   
     
     
         17 . The light-emitting device according to  claim 7 ,
 wherein the first power source feed line and the second power source feed line are configured to be set at a first potential and a at second potential, respectively, the second potential being different from the first potential.   
     
     
         18 . The light-emitting device according to  claim 1 , further comprising:
 a third column of third EL elements over the substrate, the third EL elements each comprising a third electrode connected to a third TFT and being configured to emit light of a third color different from the first color and the second color; and   a third power source feed line over the substrate, the third power source feed line being configured to supply current to the third EL elements through the third TFTs,   wherein a third width of the third power source feed line is different from the first width and the second width.   
     
     
         19 . The light-emitting device according to  claim 6 , further comprising:
 a third column of third EL elements over the substrate, the third EL elements each comprising a third electrode connected to a third TFT and being configured to emit light of a third color different from the first color and the second color; and   a third power source feed line over the substrate, the third power source feed line being configured to supply current to the third EL elements through the third TFTs,   wherein a third width of the third power source feed line is different from the first width and the second width.   
     
     
         20 . The light-emitting device according to  claim 7 , further comprising:
 a third column of third EL elements over the substrate, the third EL elements each comprising a third electrode connected to a third TFT and being configured to emit light of a third color different from the first color and the second color; and   a third power source feed line over the substrate, the third power source feed line being configured to supply current to the third EL elements through the third TFTs,   wherein a third width of the third power source feed line is different from the first width and the second width.   
     
     
         21 . The light-emitting device according to  claim 1 , further comprising:
 a third column of third EL elements over the substrate, the third EL elements each comprising a third electrode connected to a third TFT and being configured to emit light of a third color different from the first color and the second color; and   a third power source feed line over the substrate, the third power source feed line being configured to supply current to the third EL elements through the thirds TFTs,   wherein the first column is adjacent to the second column, the second column is adjacent to the third column, and   wherein the first power source feed line, the second power source feed line and the third power source feed line are distinct from each other.   
     
     
         22 . The light-emitting device according to  claim 6 , further comprising:
 a third column of third EL elements over the substrate, the third EL elements each comprising a third electrode connected to a third TFT and being configured to emit light of a third color different from the first color and the second color; and   a third power source feed line over the substrate, the third power source feed line being configured to supply current to the third EL elements through the thirds TFTs,   wherein the first column is adjacent to the second column, the second column is adjacent to the third column, and   wherein the first power source feed line, the second power source feed line and the third power source feed line are distinct from each other.   
     
     
         23 . The light-emitting device according to  claim 7 , further comprising:
 a third column of third EL elements over the substrate, the third EL elements each comprising a third electrode connected to a third TFT and being configured to emit light of a third color different from the first color and the second color; and   a third power source feed line over the substrate, the third power source feed line being configured to supply current to the third EL elements through the thirds TFTs,   wherein the first column is adjacent to the second column, the second column is adjacent to the third column, and   wherein the first power source feed line, the second power source feed line and the third power source feed line are distinct from each other.   
     
     
         24 . An electronic equipment comprising the light-emitting device according to  claim 1 . 
     
     
         25 . An electronic equipment comprising the light-emitting device according to  claim 6 . 
     
     
         26 . An electronic equipment comprising the light-emitting device according to  claim 7 .