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US 2010/0073269 A1Published application
Display device and electronic device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsShunpei YAMAZAKI, Jun KOYAMA, Kazutaka INUKAI, Mitsuaki OSAME
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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.
Claims10
A light-emitting device comprising:
- a substrate;
- a first EL element over the substrate, comprising a first electrode;
- a second EL element over the substrate, comprising a second electrode;
- a first TFT over the substrate;
- a second TFT over the substrate;
- a first power supply line over the substrate electrically connected to the first electrode via the first TFT;
- a second power supply line over the substrate electrically connected to the second electrode via the second TFT;
- a first detour wiring configured to supply a first current to the first power supply line, and not to supply the first current to the second power supply line;
- and
- a second detour wiring configured to supply a second current to the second power supply line, and not to supply the second current to the first power supply line,
- wherein a current density of the first EL element is larger than a current density of the second EL element, and
- wherein a width of the first detour wiring is larger than a width of the second detour wiring.
9 more elements
A light-emitting device comprising:
- a substrate;
- a first EL element over the substrate, comprising a first electrode;
- a second EL element over the substrate, comprising a second electrode;
- a first TFT over the substrate;
- a second TFT over the substrate;
- a first power supply line over the substrate electrically connected to the first electrode via the first TFT;
- a second power supply line over the substrate electrically connected to the second electrode via the second TFT;
- a first detour wiring configured to supply a first current to the first power supply line, and not to supply the first current to the second power supply line;
- and
- a second detour wiring configured to supply a second current to the second power supply line, and not to supply the second current to the first power supply line,
- wherein a current density of the first EL element is larger than a current density of the second EL element, and
- wherein a width of the first power supply line is larger than a width of the second power supply line.
9 more elements
A light-emitting device comprising:
- a substrate;
- a first EL element over the substrate, comprising a first electrode;
- a second EL element over the substrate, comprising a second electrode;
- a first TFT over the substrate;
- a second TFT over the substrate;
- a first power supply line over the substrate electrically connected to the first electrode via the first TFT;
- a second power supply line over the substrate electrically connected to the second electrode via the second TFT;
- a first detour wiring configured to supply a first current to the first power supply line, and not to supply the first current to the second power supply line;
- and
- a second detour wiring configured to supply a second current to the second power supply line, and not to supply the second current to the first power supply line,
- wherein a current density of the first EL element is larger than a current density of the second EL element, and
- wherein a width of the first detour wiring is larger than a width of the second detour wiring, and
- wherein a channel width of the first TFT is different from a channel width of the second TFT.
10 more elements
A light-emitting device comprising:
- a substrate;
- a first EL element over the substrate, comprising a first electrode;
- a second EL element over the substrate, comprising a second electrode;
- a first TFT over the substrate;
- a second TFT over the substrate;
- a first power supply line over the substrate electrically connected to the first electrode via the first TFT;
- a second power supply line over the substrate electrically connected to the second electrode via the second TFT;
- a first detour wiring configured to supply a first current to the first power supply line, and not to supply the first current to the second power supply line;
- and
- a second detour wiring configured to supply a second current to the second power supply line, and not to supply the second current to the first power supply line,
- wherein a current density of the first EL element is larger than a current density of the second EL element, and
- wherein a width of the first power supply line is larger than a width of the second power supply line, and
- wherein a channel width of the first TFT is different from a channel width of the second TFT.
10 more elements
Dependencies are inferred from the claim text.