Display device
First Claim
1. An electroluminescent display device having a plurality of pixel portions, each of the pixel portions comprising:
- an electroluminescent element;
a driving transistor driving the electroluminescent element;
a drain signal line;
a pixel selecting transistor supplying a signal from the drain signal line to a gate of the driving transistor; and
a storage capacitance element holding the signal supplied to the gate of the driving transistor, the storage capacitance element including an extension of a source of the pixel selecting transistor as a first capacitance electrode layer, a second capacitance electrode layer disposed above the extension of the source, an insulating film disposed on the second capacitance electrode layer and a third capacitance electrode layer connected to the source and disposed on the insulating layer,wherein the drain signal line and the third capacitance electrode layer lie in the same plane as a top plane of the insulating film.
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Accused Products
Abstract
A source of a driving transistor for driving an organic EL element functions as a first capacitance electrode layer. A second capacitance electrode layer is formed on the source through a gate insulating film of the driving transistor. The second capacitance electrode layer is formed with the same layer and by the same process as the gate electrode. A third capacitance electrode layer is formed extending over the second capacitance electrode layer through the interlayer insulating film. The third capacitance electrode layer is formed with the same layer as the drain electrode and the drain signal line. The third capacitance electrode layer is connected to the source of the driving transistor. The forming area of the storage capacitance element for holding the video signal supplied to the gate of the driving transistor can be thus reduced, improving display quality as well as extending life span of the organic El element.
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Citations
22 Claims
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1. An electroluminescent display device having a plurality of pixel portions, each of the pixel portions comprising:
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an electroluminescent element; a driving transistor driving the electroluminescent element; a drain signal line; a pixel selecting transistor supplying a signal from the drain signal line to a gate of the driving transistor; and a storage capacitance element holding the signal supplied to the gate of the driving transistor, the storage capacitance element including an extension of a source of the pixel selecting transistor as a first capacitance electrode layer, a second capacitance electrode layer disposed above the extension of the source, an insulating film disposed on the second capacitance electrode layer and a third capacitance electrode layer connected to the source and disposed on the insulating layer, wherein the drain signal line and the third capacitance electrode layer lie in the same plane as a top plane of the insulating film. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An electroluminescent display device having a plurality of pixel portions, each of the pixel portions comprising:
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an electroluminescent element including an anode layer, an emissive layer and a cathode layer; a driving transistor driving the electroluminescent element; a drain signal line; a pixel selecting transistor supplying a signal from the drain signal line to a gate of the driving transistor; and a storage capacitance element holding the signal supplied to the gate of the driving transistor, the storage capacitance element including an extension of a source of the pixel selecting transistor as a first capacitance electrode layer, a second capacitance electrode layer disposed above the extension of the source, a third capacitance electrode layer connected to the source and disposed above the second capacitance electrode layer, a fourth capacitance electrode layer connected to the third capacitance electrode layer and disposed above the third capacitance electrode layer and a fifth capacitance electrode layer disposed above the fourth capacitance electrode layer and not connected with the fourth capacitance electrode layer, wherein the fifth capacitance electrode layer is an extension of the cathode layer. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An electroluminescent display device having a plurality of pixel portions, each of the pixel portions comprising:
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an electroluminescent element; a driving transistor driving the electroluminescent element; a drain signal line; a pixel selecting transistor supplying a signal from the drain signal line to a gate of the driving transistor and comprising a semiconductor layer comprising a source and drain; and a storage capacitance element holding the signal supplied to the gate of the driving transistor, the storage capacitance element comprising a first capacitance electrode layer, a second capacitance electrode layer disposed above the first capacitance electrode layer, an insulating film disposed on the second capacitance electrode layer and a third capacitance electrode layer connected to the source of the pixel selecting transistor and disposed on the insulating layer, wherein the drain signal line and the third capacitance electrode layer lie in the same plane as a top plane of the insulating film, and the first capacitance electrode layer lies in the same plane as the semiconductor layer lies, and the first and third capacitance electrode layers are confignred to receive the signal from the drain signal line. - View Dependent Claims (19, 20, 21, 22)
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Specification