Display device having a capacitor including a capacitor electrode integrally formed with a gate electrode of a transistor

1 . A display device comprising:

a substrate;

a first voltage line in a first metal layer on the substrate;

a plurality of pixels, each of the plurality of pixels comprising:

a first transistor comprising: a drain electrode in an active layer on the first metal layer and electrically connected to the first voltage line, an active region adjacent to the drain electrode, a source electrode adjacent to the active region, and a gate electrode in a second metal layer on the active layer; and

a single first capacitor comprising: a first capacitor electrode integrally formed with the gate electrode of the first transistor and having a closed-loop shape, and a second capacitor electrode in the first metal layer and overlapping with the first capacitor electrode,

wherein the first capacitor electrode is completely spaced from the second capacitor electrode in a thickness direction of the substrate,

wherein the first capacitor electrode surrounds a first contact hole, and

wherein the first transistor is connected to a first connection electrode of the display device through the first contact hole.

2 . A display device comprising:

a substrate;

a first voltage line in a first metal layer on the substrate;

a first transistor comprising: a drain electrode in an active layer on the first metal layer and electrically connected to the first voltage line, an active region adjacent to the drain electrode, a source electrode adjacent to the active region, and a gate electrode in a second metal layer on the active layer;

a first capacitor comprising: a first capacitor electrode integrally formed with the gate electrode of the first transistor and having a closed-loop shape, and a second capacitor electrode in the first metal layer and overlapping with the first capacitor electrode; and

a first connection electrode,

wherein the first connection electrode is in a third metal layer on the second metal layer, the first connection electrode is connected to the source electrode of the first transistor through a first contact hole, and the first connection electrode is connected to the second capacitor electrode through a second contact hole.

3 . The display device of claim 2 , wherein the first capacitor electrode surrounds the first contact hole.

4 . The display device of claim 2 , further comprising:

a first data line in the first metal layer; and

a second transistor comprising: a drain electrode in the active layer and electrically connected to the first data line, an active region adjacent to the drain electrode, a source electrode adjacent to the active region, and a gate electrode in the second metal layer.

5 . The display device of claim 4 , further comprising: a second connection electrode, wherein the second connection electrode is in the third metal layer on the second metal layer, the second connection electrode is connected to the source electrode of the second transistor through a third contact hole, and the second connection electrode is connected to the first capacitor electrode through a fourth contact hole.

6 . The display device of claim 5 , wherein the second connection electrode is on the right in a first direction of the source electrode of the first transistor, and

wherein the first connection electrode is located in a second direction crossing the first direction of the second connection electrode.

7 . The display device of claim 5 , wherein the fourth contact hole is located between the source electrode of the first transistor and the third contact hole.

8 . The display device of claim 5 , wherein the fourth contact hole is located in a first direction of the source electrode of the first transistor, and the fourth contact hole is located in a second direction crossing the first direction of the third contact hole.

9 . The display device of claim 5 , wherein the first capacitor electrode comprises:

a first portion surrounding the first contact hole;

a second portion protruding from the first portion in a first direction; and

a third portion protruding from the first portion in a second direction crossing the first direction,

wherein the first portion and the third portion of the first capacitor electrode overlap the second capacitor electrode.

10 . The display device of claim 9 , wherein the second portion of the first capacitor electrode is connected to the second connection electrode through the fourth contact hole.

11 . A display device comprising:

a first data line, a second data line, and a third data line extending in parallel on a substrate;

a pixel circuit of a first pixel configured to receive a data voltage from the first data line;

a pixel circuit of a second pixel configured to receive a data voltage from the second data line;

a pixel circuit of a third pixel configured to receive a data voltage from the third data line and located between the pixel circuit of the first pixel and the pixel circuit of the second pixel; and

a light-emitting element of the third pixel configured to receive a driving current from the pixel circuit of the third pixel,

wherein the pixel circuit of the third pixel comprises:

a first transistor connected between a first voltage line and the light-emitting element of the third pixel;

a first connection electrode electrically connecting a source electrode of the first transistor with the light-emitting element of the third pixel;

a first capacitor comprising: a first capacitor electrode integrally formed with a gate electrode of the first transistor and a second capacitor electrode connected to the first connection electrode;

a second transistor electrically connecting the third data line with the first capacitor electrode; and

a second connection electrode electrically connecting the first capacitor electrode with a source electrode of the second transistor,

wherein the second connection electrode is connected to the source electrode of the second transistor through a first contact hole, wherein the first capacitor electrode surrounds only three sides of the first contact hole,

wherein the first connection electrode is between the pixel circuit of the first pixel and the second connection electrode, and the first connection electrode is between the pixel circuit of the second pixel and the second connection electrode, and

wherein a first capacitor electrode of the second pixel has a shape in which a third side opposite to a second side is open.

12 . The display device of claim 11 , wherein the second transistor of the third pixel is on a first side of the second connection electrode, and

wherein the first connection electrode surrounds the second connection electrode except for the first side of the second connection electrode.

13 . The display device of claim 12 , further comprising:

a light-emitting element of the first pixel configured to receive a driving current from the pixel circuit of the first pixel,

wherein the pixel circuit of the first pixel comprises:

a first transistor connected between the first voltage line and the light-emitting element of the first pixel;

a third connection electrode electrically connecting the source electrode of the first transistor with the light-emitting element of the first pixel;

a first capacitor comprising: a first capacitor electrode integrally formed with the gate electrode of the first transistor and a second capacitor electrode connected to the third connection electrode;

a second transistor electrically connecting the first data line with the first capacitor electrode; and

a fourth connection electrode electrically connecting the first capacitor electrode with the source electrode of the second transistor.

14 . The display device of claim 13 , wherein the first capacitor electrode of the third pixel has a closed-loop shape, and

wherein the first capacitor electrode of the first pixel has a shape in which a second side different from the first side is open.

15 . The display device of claim 13 , wherein the first capacitor of the first pixel is located between the fourth connection electrode and the pixel circuit of the third pixel.

16 . The display device of claim 13 , further comprising:

a light-emitting element of the second pixel configured to receive a driving current from the pixel circuit of the second pixel,

wherein the pixel circuit of the second pixel comprises:

a first transistor connected between the first voltage line and the light-emitting element of the second pixel;

a fifth connection electrode electrically connecting the source electrode of the first transistor with the light-emitting element of the second pixel;

a first capacitor comprising: the first capacitor electrode that is integrally formed with the gate electrode of the first transistor and a second capacitor electrode connected to the fifth connection electrode;

a second transistor electrically connecting the second data line with the first capacitor electrode; and

a sixth connection electrode electrically connecting the first capacitor electrode with the source electrode of the second transistor.

17 . The display device of claim 16 , wherein the first capacitor electrode of the third pixel has a closed-loop shape, and

wherein the first capacitor electrode of the first pixel has a shape in which a second side different from the first side is open.

18 . The display device of claim 11 , wherein the first capacitor electrode of the third pixel has a closed-loop shape, and the second connection electrode overlaps with a part of the closed-loop shape.

19 . The display device of claim 11 , wherein the first capacitor electrode of the third pixel comprises:

a first portion having a closed-loop shape;

a second portion protruding from a first side of the first portion; and

a third portion protruding from a second side different from the first side of the first portion, and

wherein the first portion and the third portion overlap with the second capacitor electrode of the third pixel.

20 . The display device of claim 19 , wherein the second connection electrode overlaps with the second portion of the first capacitor electrode of the third pixel.