Active-type electroluminescent display
First Claim
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1. An active-type light emitting display comprising:
- a light emission panel including light emission elements each having a first electrode, a second electrode, and an emissive portion, and thin film transistors for respectively driving said light emission elements;
said light emission elements and at least one of said thin film transistor are formed on or above a same substrate;
said first electrode is electrically connected to at least one of said thin film transistors and is formed over an insulating layer, which is formed covering said at least one of said thin film transistors;
said second electrode is formed in a pattern that is common for a plurality of pixels, above said first electrode;
said thin film transistor includes a first conductive material that is formed between said substrate and said first electrode, said first conductive material is formed below said second electrode;
a connection conductor for connecting said second electrode and a signal supply portion, said signal supply portion supplying a signal to said second electrode for controlling said second electrode separately from said first electrode; and
said connection conductor having a section between said second electrode and said signal supply portion, at least a part of said section being a multilayer structure formed of a second electrode material used for said second electrode and a second conductive material, said first conductive material is the same material as said second conductive material, said multilayer structure having a resistance lower than a resistance of a single layer of said second electrode material.
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Abstract
In an active-type electroluminescent (EL) display, a conductor interconnecting a cathode (55) of an EL panel (30, 40) and a connection terminal of a signal input substrate (35) has a multilayer structure formed of a cathode material and a conductive material used in a thin-film transistor forming step. The conductor may be formed of a conductive material used in a thin film transistor forming step. A metal material for a gate electrode or drain electrode is preferably used as the conductive material. The connection conductor structure can reduce the electrical resistance of the connection conductor, thus preventing a decrease in display intensity of an EL display.
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Citations
18 Claims
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1. An active-type light emitting display comprising:
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a light emission panel including light emission elements each having a first electrode, a second electrode, and an emissive portion, and thin film transistors for respectively driving said light emission elements;
said light emission elements and at least one of said thin film transistor are formed on or above a same substrate;
said first electrode is electrically connected to at least one of said thin film transistors and is formed over an insulating layer, which is formed covering said at least one of said thin film transistors;
said second electrode is formed in a pattern that is common for a plurality of pixels, above said first electrode;
said thin film transistor includes a first conductive material that is formed between said substrate and said first electrode, said first conductive material is formed below said second electrode;
a connection conductor for connecting said second electrode and a signal supply portion, said signal supply portion supplying a signal to said second electrode for controlling said second electrode separately from said first electrode; and
said connection conductor having a section between said second electrode and said signal supply portion, at least a part of said section being a multilayer structure formed of a second electrode material used for said second electrode and a second conductive material, said first conductive material is the same material as said second conductive material, said multilayer structure having a resistance lower than a resistance of a single layer of said second electrode material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An active-type electroluminescent display comprising:
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a light emission panel including light emission elements each having a first electrode, a second electrode, and a luminous portion, and thin film transistors for respectively driving said light emission elements;
said light emission elements and at least one of said thin film transistor are formed on or above a same substrate;
said first electrode is electrically connected to at least one of said thin film transistors and is formed over an insulating layer, which is formed covering said at least one of said thin film transistors;
said second electrode is formed in a pattern that is common for a plurality of pixels, above said first electrode;
said thin film transistor includes a first conductive material that is formed between said substrate and said first electrode, said first conductive material is formed below said second electrode;
a connection conductor for connecting said second electrode and a signal supply portion, said signal supply portion supplying a signal to said second electrode for controlling said second electrode separately from said first electrode; and
said connection conductor having a section between said second electrode and said signal supply portion, at least a part of said section being formed of a second conductive material, said first conductive material is the same material as said second conductive material, said part having a resistance lower than a resistance of a single layer of a material used for said second electrode. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. An active-type light emitting display comprising:
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a light emission panel including light emission element each having a first electrode, a second electrode, and an emissive portion, and thin film transistors for respectively driving said light emission elements;
said light emission elements and at least one of said thin film transistor are formed on or above a same substrate;
said first electrode is electrically connected to at least one of said thin film transistors and is formed over an insulating layer, which is formed covering said at least one of said thin film transistors;
said second electrode is formed in a pattern that is common for a plurality of pixels, above said first electrode; and
said thin film transistor includes a first conductive material that is formed between said substrate and said first electrode, said first conductive material is formed below said second electrode;
a connection conductor for connecting said second electrode and a signal supply portion, said signal supply portion supplying a signal to said second electrode for controlling said second electrode separately from said first electrode;
said connection conductor having a section between said second electrode and said signal supply portion, at least a part of said section being a multilayer structure formed of a second electrode material used for said second electrode and a second conductive material, said first conductive material is the same material as said second conductive material, said multilayer structure having a resistance lower than a resistance of a single layer of said second electrode material.
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18. An active-type electroluminescent display comprising:
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a light emission panel including light emission elements each having a first electrode, a second electrode, and a luminous portion, and thin film transistors for respectively driving said light emission elements;
said light emission elements and at least one of said thin film transistor are formed on or above a same substrate;
said first electrode is electrically connected to at least one of said thin film transistors and is formed over an insulating layer, which is formed covering said at least one of said thin film transistors;
said second electrode is formed in a pattern that is common for a plurality of pixels above said first electrode;
said thin film transistor includes a first conductive material that is formed between said substrate and said first electrode, said first conductive material is formed below said second electrode;
a connection conductor for connecting said second electrode and a signal supply portion, said signal supply portion supplying a signal to said second electrode for controlling said second electrode separately from said first electrode; and
said connection conductor having a section between said second electrode and said signal supply portion, at least a part of said section being formed of a second conductive material, said first conductive material is the same material as said second conductive material, said part having a resistance lower than a resistance of a single layer of a material used for said second electrode.
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Specification