Display apparatus and method of manufacturing display apparatus
A display apparatus includes: a light emitting device in which a first electrode, a light emitting layer, and a second electrode are laminated; a pixel circuit, which is arranged on a lower side of the light emitting device, having a drive transistor including a source electrode connected to the first electrode and controlling a current supplied to the light emitting device; a first metal plate and a second metal plate arranged to face the light emitting layer across the first electrode; and a first insulating layer arranged between the first electrode and both the first metal plate and the second metal plate. The first metal plate is connected to a gate electrode of the drive transistor, the second metal plate is connected to a first voltage line, and the first metal plate and the second metal plate are arranged on the same plane face.
1. A display apparatus comprising:
a light emitting device in which a first electrode, a light emitting layer, and a second electrode are laminated;
a pixel circuit disposed below the light emitting device, and including a drive transistor with a source electrode connected to the first electrode, the drive transistor configured to control a current supplied to the light emitting device;
a first metal plate facing the light emitting layer across the first electrode and connected to a gate electrode of the drive transistor;
a second metal plate facing the light emitting layer across the first electrode and connected to a first voltage line; and
a first insulating layer disposed between the first electrode and both the first metal plate and the second metal plate,
wherein the first metal plate and the second metal plate are disposed on a same plane surface.
2. The display apparatus according to claim 1 , wherein
a first capacitor includes the first electrode, the first insulating layer, and the first metal plate,
a second capacitor includes the first electrode, the first insulating layer, and the second metal plate,
the first capacitor and the second capacitor are connected in series, and
a connection point of the first capacitor and the second capacitor is connected to the source electrode.
3. The display apparatus according to claim 2 , wherein the first capacitor stores at least electric charge according to luminance of the light emitting device.
4. The display apparatus according to claim 2 , wherein the pixel circuit applies a second voltage of less than a sum of a voltage corresponding to a light emission threshold of the light emitting device and a voltage of the first voltage line to the first electrode and applies a third voltage of equal to or greater than a sum of a threshold voltage of the drive transistor and the second voltage to the gate electrode.
5. The display apparatus according to claim 4 , wherein the pixel circuit causes the drive transistor to be conductive and applies a fourth voltage of equal to or greater than a voltage acquired by subtracting the threshold voltage from the third voltage to a drain electrode of the drive transistor.
6. The display apparatus according to claim 5 , wherein the pixel circuit stops applying the fourth voltage to the drain electrode and applies a voltage corresponding to emission luminance of the light emitting device to the gate electrode.
7. The display apparatus according to claim 1 , wherein
the pixel circuit includes a planarization layer on the drive transistors, and
the first metal plate and the second metal plate are disposed on a same surface of the planarization layer.
8. The display apparatus according to claim 7 , wherein
the same first insulating layer is disposed on the first metal plate and the second metal plate, and cover a slit space between the first metal plate and the second metal plate.
9. The display apparatus according to claim 1 , wherein
the first electrode has a planar shape, and
the same first insulating layer is disposed between the first metal plate and the first electrode and between the second metal plate and the first electrode.
10. The display apparatus according to claim 1 , wherein a distance between the first metal plate and the first electrode is equal to a distance between the second metal plate and the first electrode.
11. The display apparatus according to claim 1 , further comprising a second insulating layer, which has a planar shape, including an aperture through which light emission of the light emitting device is output and a non-aperture,
wherein the second insulating layer is disposed on a layer different from a layer in which the first metal plate and the second metal plate are disposed.
12. The display apparatus according to claim 11 , wherein a contact hole of the first metal plate and the gate electrode is covered with the non-aperture.
13. The display apparatus according to claim 11 , wherein a contact hole of the source electrode is covered with the non-aperture.
14. The display apparatus according to claim 11 , wherein the whole area of the aperture faces the first metal plate across the first electrode.
15. The display apparatus according to claim 11 , wherein the whole area of the aperture faces the second metal plate across the first electrode.
16. The display apparatus according to claim 11 , wherein
the aperture includes a first area and a second area not overlapping each other,
the first area faces the first metal plate across the first electrode, and
the second area faces the second metal plate across the first electrode.
17. The display apparatus according to claim 1 , wherein the first metal plate is connected to the source electrode, and a contact hole of the first metal plate and the source electrode is not covered with the first electrode.
18. The display apparatus according to claim 1 , wherein the second metal plate is connected to the second electrode.
19. The display apparatus according to claim 1 , wherein the second metal plate is connected to a drain electrode of the drive transistor.
20. A method of manufacturing a display apparatus, the method comprising:
arranging a transistor including a source electrode, a drain electrode, and a gate electrode on one face of a substrate;
arranging a third insulating layer covering the transistor on an upper side of the transistor;
arranging a first metal plate connected to the gate electrode through a first conduction part passing through the third insulating layer and a second metal plate insulated from the first metal plate in a same layer disposed on an upper side of the third insulating layer;
arranging a first insulating layer on an upper side of the layer of the first metal plate and the second metal plate;
arranging a first electrode connected to the source electrode through a second conduction part passing through the first insulating layer and the third insulating layer on an upper side of the first insulating layer;
arranging a light emitting layer on an upper side of the first electrode; and
arranging a second electrode on an upper side of the light emitting layer.