Luminescent display device

1. A luminescent display device, comprising:

a substrate; and

a plurality of pixels above the substrate,

each of the pixels including:

a thin film transistor above the substrate, the thin film transistor including:

a semiconductor layer comprising a channel region, a source region, and a drain region;

a source electrode electrically connected to the source region of the semiconductor layer; and

a drain electrode electrically connected to the drain region of the semiconductor layer;

a lower electrode above the substrate, the lower electrode including a first portion and a second portion, the first portion of the lower electrode being provided in a region in which the thin film transistor is provided, the first portion of the lower electrode comprising a gate electrode of the thin film transistor, the second portion of the lower electrode being provided in a region other than the region in which the thin-film transistor is provided the lower electrode, including the first portion and the second portion, comprising one continuous layer;

an interlayer insulating film on the lower electrode;

an upper electrode on the interlayer insulating film, the upper electrode including a first portion and a second portion, the upper electrode, including the first portion and the second portion, comprising one continuous layer, the first portion of the upper electrode comprising a capacitor electrode directly above the gate electrode, the first portion of the upper electrode further comprising the source electrode, the capacitor electrode and the source electrode being connected via a through-hole in the interlayer insulating film; and

a luminescent element configured to be driven by a driver to produce luminescence, the driver including the thin film transistor,

wherein the first portion of the upper electrode and the first portion of the lower electrode comprise a first capacitance, and the second portion of the upper electrode and the second portion of the lower electrode comprise a second capacitance.

2. The luminescent display device according to claim 1 ,

wherein an area of a lower surface of the first portion of the upper electrode, in the region in which the thin film transistor is provided, is approximately 30% to approximately 100% of an area of an upper surface of the gate electrode.

3. The luminescent display device according to claim 1 ,

wherein the semiconductor layer comprises polysilicon.

4. The luminescent display device according to claim 1 ,

wherein the first capacitance is approximately 0.1 pF to approximately 10 pF.

5. The luminescent display device according to claim 1 ,

wherein the luminescent display device is a top-emission luminescent display device, and

the luminescent element is in a layer above the upper electrode.

6. The luminescent display device according to claim 1 ,

wherein the luminescent display device is a bottom-emission luminescent display device, and

the thin-film transistor, the lower electrode, and the upper electrode are in a region other than a luminescent region in which the luminescent element is disposed.

7. The luminescent display device according to claim 1 ,

wherein the one continuous layer of the upper electrode includes the source electrode of the thin film transistor.

8. The luminescent display device according to claim 7 , further comprising:

a power line connected to the one of the source electrode and the drain electrode of the thin film transistor,

wherein the one continuous layer of the upper electrode further includes the power line.