Display device with trench passing through partition wall
Provided is a display device including a first sub-pixel, a second sub-pixel adjacent to the first sub-pixel. The first sub-pixel and the second sub-pixel each include a semiconductor film, a gate electrode, a gate insulating film, an interlayer insulating film, and a leveling film and further possesses a light-emitting element located over the leveling film. The display device has a partition wall located between the first sub-pixel and the second sub-pixel and a trench passing through the leveling film.
1. A display device comprising:
a first sub-pixel;
a second sub-pixel adjacent to the first sub-pixel; and
a partition wall located at a boundary between the first sub-pixel and the second sub-pixel, the first sub-pixel and the second sub-pixel each comprising:
a thin-film transistor including a semiconductor film, a gate electrode, a source electrode, and a drain electrode, the source electrode and the drain electrode being electrically connected to the semiconductor film;
a gate insulating film between the semiconductor film and the gate electrode;
an interlayer insulating film over the semiconductor film, the gate electrode, and the gate insulating film and under the source electrode and the drain electrode;
a leveling film over the source electrode and the drain electrode; and
a light-emitting element over the leveling film, the light-emitting element including an EL layer between a first electrode and a second electrode,
wherein:
an edge portion of the first electrode is covered by the partition wall;
a part of the second electrode is located over the partition wall;
an overlapping region where the leveling film overlaps with the partition wall in a plane view is located between the first sub-pixel and the second sub-pixel;
a trench passing through the leveling film and the partition wall is located in the overlapping region; and
the EL layer is in contact with the interlayer insulating film via the trench.
2. The display device according to claim 1 , further comprising a gate line,
wherein:
the gate line is electrically connected to a pixel circuit of the first sub-pixel and a pixel circuit of the second sub-pixel; and
the trench extends in a direction parallel to the gate line.
3. The display device according to claim 1 , further comprising a gate line,
wherein:
the gate line is electrically connected to a pixel circuit of the first sub-pixel and a pixel circuit of the second sub-pixel; and
the trench extends in a direction perpendicular to the gate line.
4. The display device according to claim 3 , further comprising:
a current-supplying line configured to supply current to the pixel circuit of the first sub-pixel; and
a signal line configured to supply an image signal to the pixel circuit of the second sub-pixel,
wherein the trench is located between the current-supplying line and the signal line.
5. The display device according to claim 1 , further comprising a flexible base material,
wherein the first sub-pixel and the second sub-pixel are located over the flexible base material.
6. The display device according to claim 1 , further comprising a plurality of sub-pixels including the first sub-pixel and the second sub-pixel,
wherein the trench surrounds each of the plurality of sub-pixels.
7. The display device according to claim 1 , further comprising a plurality of sub-pixels including the first sub-pixel and the second sub-pixel,
wherein the trench surrounds more than one sub-pixels of the plurality of sub-pixels.
8. A display device comprising:
a first pixel;
a second pixel adjacent to the first pixel; and
a partition wall located at a boundary between the first pixel and the second pixel, the first pixel and the second pixel each including a first sub-pixel,
wherein the first sub-pixel comprising:
a thin-film transistor having a semiconductor film, a gate electrode, a source electrode, and a drain electrode, the source electrode and the drain electrode being electrically connected to the semiconductor film;
a gate insulating film between the semiconductor film and the gate electrode;
an interlayer insulating film over the semiconductor film, the gate electrode, and the gate insulating film and under the source electrode and the drain electrode;
a leveling film over the source electrode and the drain electrode; and
a light-emitting element over the leveling film, the light-emitting element including an EL layer between a first electrode and a second electrode,
an edge portion of the first electrode is covered by the partition wall,
a part of the second electrode is located over the partition wall,
an overlapping region where the leveling film overlaps with the partition wall in a plane view is located between the first pixel and the second pixel,
a trench passing through the partition wall and reaching at least a part of the leveling film is located in the overlapping region, and
the EL layer is in contact with a bottom surface of the trench.
9. The display device according to claim 8 ,
wherein a thickness of the leveling film in the trench is smaller than a thickness of the leveling film facing the first sub-pixel.
10. The display device according to claim 8 , further comprising a gate line,
wherein:
the gate line is electrically connected to a pixel circuit in the first pixel and a pixel circuit in the second pixel; and
the trench extends in a direction perpendicular to the gate line and overlaps with the gate line.
11. The display device according to claim 8 , further comprising a signal line,
the signal line is electrically connected to a pixel circuit in the first pixel and a pixel circuit in the second pixel; and
the trench extends in a direction intersecting the signal line and overlaps with the signal line.
12. The display device according to claim 8 , further comprising:
a signal line; and
a second interlayer insulating film on and in contact with the interlayer insulating film,
wherein:
the signal line is electrically connected to a pixel circuit in the first pixel and a pixel circuit in the second pixel;
the signal line is divided into two portions in a region overlapping with the trench;
the two portions are electrically connected to each other via a connection electrode; and
the connection electrode is located between the interlayer insulating film and the second interlayer insulating film.
13. The display device according to claim 8 , further comprising:
a gate line; and
a second interlayer insulating film on and in contact with the interlayer insulating film,
wherein:
the gate line is electrically connected to a pixel circuit in the first pixel and a pixel circuit in the second pixel;
the gate line is divided into two portions in a region overlapping with the trench;
the two portions are electrically connected to each other via a connection electrode; and
the connection electrode is located between the interlayer insulating film and the second interlayer insulating film.
14. The display device according to claim 8 , further comprising:
a gate line electrically connected to a pixel circuit in the first pixel and a pixel circuit in the second pixel; and
a signal line electrically connected to one of the pixel circuit in the first pixel and the pixel circuit in the second pixel,
wherein the trench extends in a direction parallel to the signal line and is divided in a region overlapping with the gate line.
15. The display device according to claim 8 , further comprising:
a gate line electrically connected to a pixel circuit in the first pixel and a pixel circuit in the second pixel; and
a signal line electrically connected to one of the pixel circuit in the first pixel and the pixel circuit in the second pixel,
wherein the trench extends in a direction parallel to the gate line and is divided in a region overlapping with the signal line.
16. The display device according to claim 8 ,
wherein:
the trench passes through the leveling film;
the bottom surface of the trench is a top surface of the interlayer insulating film, the top surface being exposed by the trench and being not in contact with the leveling film; and
the EL layer is in contact with the top surface.
17. The display device according to claim 8 , further comprising a plurality of pixels including the first pixel and the second pixel,
wherein the trench demarcates more than one pixels of the plurality of pixels in an island shape.